Re: [Matplotlib-users] Labels in a dynamic graph
Hello Amit,
On Sunday 23 March 2008 09:54, Amit Finkler wrote:
Hi everyone,
I am using matplotlib to dynamically plot a graph with both my x and y
points taken from a measurement device. That is to say, in each
iteration of my while loop I'm reading two variables which I then want
to plot with matplotlib.
I wrote something which goes like this (disregard the Gnuplot - that's
what I'm trying to replace with matplotlib...)
import gpib, Numeric, time, Gnuplot, mymodule, threading
from pylab import *
def cooldown(filename, dmm_gpib, lake_gpib):
this program scans dummy and reads HP and Lakeshore
A = Numeric.arange(-1, 1, .1)
delay = 1
f = open(filename,'w')
X = []
Y = []
figure(2)
hold(False)
try:
while A[0]10:
gpib.write(lake_fd, 'SDAT?')
gpib.write(hp_fd, 'read?')
time.sleep(delay)
val1 = float(gpib.read(lake_fd, 30))
val2 = float(gpib.read(hp_fd, 30))
X.append(val1)
Y.append(val2)
plot(X,Y,'.-')
f.write(str(val1) + '\t' + str(val2) + '\n')
f.flush()
I'm running this code in ipython with the -pylab option, so I don't need
to use show(). My question is, how do I maintain a *constant* xlabel and
ylabel without having to redraw them each time I append a point to the
graph? If I try xlabel('something') then obviously it's cleared each
time I use plot(X,Y).
I'm not sure I understand well, but if one uses xlabel(something) before the
while-loop or just after building the figure, it is not redrawn after
plotting.
regards
Matthias
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Re: [Matplotlib-users] Runtime Error
On Monday 24 March 2008 01:52:27 pm Brook Lin wrote: After installation, I only ran a simple code attached below. I found that I got this run time error from from pylab import *. I did go through what Mark Hamilton posted: Index: cutils.py === --- cutils.py (revision 5001) +++ cutils.py (working copy) @@ -79,7 +79,7 @@ raise RuntimeError(\ '%s' is not a writable dir; you must set %s/.matplotlib to be a writable dir. You can also set environment variable MPLCONFIGDIR to any writable directory -where you want matplotlib data stored %h) +where you want matplotlib data stored %(p,h)) else: if not is_writable_dir(h): raise RuntimeError(Failed to create %s/.matplotlib; consider setting MPLCONFIGDIR to a writable directory for matplotlib configuration data%h) I changed where you want matplotlib data stored %h) into where you want matplotlib data stored %(p,h)). However, I got the same error after changes. Did I do right? Sorry, cutils.py is a part of a new config package we have been working on, which ships with matplotlib but is not activated. I think you need to edit your matplotlib/__init__.py instead, just make the same changes. Once that change is made, and you try to import pylab, you should get a RunTimeError telling you that matplotlib can't create the directory, either because the path doesnt exist, or it exists but you cant write to it. At that point you can set your MPLCONFIGDIR environment variable to point somewhere writeable, and if it seems like a bug that matplotlib is trying to create a directory somewhere nonsensical, please let us know. I install matplotlib by: python setup.py build python setup.py install How can I install it by svn trunk? The following should be on one line: svn co https://matplotlib.svn.sourceforge.net/svnroot/matplotlib/trunk/matplotlib matplotlib then cd into the new directory and install in the usual way. Darren - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] ipython, pylab quitting again after first time
Hello, I have some trouble with ipython and matplotlib. I create a figure in one of my functions that I call from ipython. The first time it runs fine and I can use the figure interactively (selecting/ deselcting points and so on). The second time I run it, the code doesnt stop but continues without halting at the show routine. I'm doing this on a Mac (10.5.2/ Intel). On my Linux machine I did pylab.get_current_figure_manager().destroy() and bound it to a key to prevent this. If I do this on the mac (WXAgg) The next time I want to plot it complains about a deleted C++ extension and doesnt plot at all. Please help Wolfgang - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] I really need help about installing matplotlib.
lovegf86 wrote: What is the problem? Do I need to update numpy? Please help me, I am so desperate.. Install Python 2.5 from here: http://python.org/ftp/python/2.5.2/python-2.5.2.msi Install NumPy from here: http://downloads.sourceforge.net/numpy/numpy-1.0.4.win32-p3-py2.5.exe Install the windows binary for python 2.5 from here: http://downloads.sourceforge.net/matplotlib/matplotlib-0.91.2.win32-py2.5.exe Ignore the Enthought stuff ;-) cheers, Chris -- Simplistix - Content Management, Zope Python Consulting - http://www.simplistix.co.uk - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] ipython, pylab quitting again after first time
Can you attach the traceback? Cheers, Mike Wolfgang Kerzendorf wrote: Hello, I have some trouble with ipython and matplotlib. I create a figure in one of my functions that I call from ipython. The first time it runs fine and I can use the figure interactively (selecting/ deselcting points and so on). The second time I run it, the code doesnt stop but continues without halting at the show routine. I'm doing this on a Mac (10.5.2/ Intel). On my Linux machine I did pylab.get_current_figure_manager().destroy() and bound it to a key to prevent this. If I do this on the mac (WXAgg) The next time I want to plot it complains about a deleted C++ extension and doesnt plot at all. Please help Wolfgang - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce this bug?
Mark Bakker wrote:
Thanks to Fred, Chris, and JV for reproducing this bug.
We all get the same eps file, that doesn't show the greek symbols
produced with mathtext.
And we all do get correct results on the screen (using Tk) and in pdf
and png files.
I loaded the *eps* file in Adobe Photoshop and the *chi* letter **was**
displayed along the x-axis. -- jv
It seems not to work on windows, while it used to work on versions
0.90.1 and earlier.
Sorry for the bad news.
Anybody know how to fix this?
Thanks, Mark
On Sun, Mar 23, 2008 at 5:02 PM, Mark Bakker [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
Hello windows users -
Can anybody using mpl 0.91.2 on windows reproduce this bug:
from pylab import *
plot([1,2,3])
xlabel(r'$\chi$')
savefig('c:/temp/test.eps')
This should give an eps file that when viewed does not show the
letter chi along the x-axis (that's the bug).
We have been discussing this problem, and I think it is a bug in
the windows distribution.
(It worked on all the previous mpl versions fine, just when
upgrading from 0.90.1 the problem arose).
If you can, please email me your eps file: [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED]
Thanks for your help, Mark
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Re: [Matplotlib-users] I really need help about installing matplotlib.
On Tue, 25 Mar 2008, Chris Withers apparently wrote: Install NumPy from here: http://downloads.sourceforge.net/numpy/numpy-1.0.4.win32-p3-py2.5.exe I missed the OP's query, so just for insurance: use the p3 version if you have a Pentium 3 (no SSE2 support). On newer Pentiums, you do not need this version. Cheers, Alan Isaac - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce this bug?
On Tue, 25 Mar 2008, Jim Vickroy apparently wrote: I loaded the eps file in Adobe Photoshop and the chi letter **was** displayed along the x-axis. -- jv Sounds like perhaps the symbol is not embedded in the EPS file. Cheers, Alan Isaac - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Labels in a dynamic graph
On Sun, Mar 23, 2008 at 3:54 AM, Amit Finkler [EMAIL PROTECTED] wrote:
I am using matplotlib to dynamically plot a graph with both my x and y
points taken from a measurement device. That is to say, in each iteration of
my while loop I'm reading two variables which I then want to plot with
matplotlib.
You will want to do something like (this is just a sketch)
xdata = []
ydata = []
fig = figure()
ax = fig.add_subplot(111)
ax.set_xlabel('my xlabel')
ax.set_ylabel('my ylabel')
line, = ax.plot(xdata, ydata)
def add_point(x, y):
xdata.append(x)
ydata.append(y)
if len(xdata)30: # optional, prune the early points
del xdata[0]
del ydata[0]
xmin = xdata[0]
xmax = xdata[-1]
line.set_data(xdata, ydata)
ax.set_xlim(xmin, xmax)
fig.canvas.draw()
while 1:
x,y = get_data_point()
add_point(x, y)
JDH
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[Matplotlib-users] OT warning! Re: Plotting in C++
Sorry, this really is OT, but I've been doing some research on this issue, so I thought I see what folks here think: Francesco Biscani wrote: However the C++ programming style which is sometimes referred to as modern C++ OK, so I'll take it as a given for the moment that Modern C++ is typesafe, and, of course JAVA is. Those are the two primary languages that people seem to want to use rather than Python. I recently had a Java vs. Python discussion at work, so I dug into it on the net once again -- My thesis is that aside from syntax, library support etc, etc, the difference is static vs. dynamic typing. Here's my quickie synopsis: * Dynamic typing allows more flexibility and therefor greater productivity. * Static typing provides more safety, and the ability to optimize compiled code. Ignoring performance issues, that leaves: Productivity vs. type safety. What I've found is that folks that are fans of statically typed languages really don't get how much productivity can increase. If you haven't really written code in a dynamic language (and I mean really, if you write Fortran with Python syntax, that doesn't count), you tend to think that all you're saving is the typing involved in declaring types and interfaces, etc. That's simply not the case -- dynamically typed languages let you build far more flexible systems with far less code. This has been well documented, at least anecdotally. So the question is: does the type safety you get out weigh the productivity gains? Some say not for quickie scripts, but yes to big systems, or particularly for if it fails, someone can die systems. I'm not so sure. We all make type errors when writing code (forget to turn that string into a number before passing it off to the calculation code, or whatever), the fact that a static language's compiler catches a lot of errors like that doesn't mean at all that they wouldn't get caught quickly with a dynamic language. In fact, my personal experience is that those kind of errors get caught very quickly, usually the first test of the code in question. The point is that while the compiler can catch those bugs for you, those aren't the bugs I care about. In fact, in my reading, I haven't found a SINGLE anecdote by anyone about a deep, hard to find bug caused by a type error in a dynamic language, Not one. Has anyone seen such an anecdote? Or better yet, a real study? So why are people so concerned, and letting these issues drive their decisions? A couple reasons: 1) All they know is that their compiler is catching a lot of errors, so they can imagine that some of those errors would never be found if the compiler wasn't finding them -- you know that sense of relief when you finally get a bunch of code to compile! Even though it may not work right at all, there's still a sense of accomplishment. 2) When you've primarily worked with static languages, you really don't get how much less code you can write with a dynamically typed language -- you're so used to thinking that a given method is designed to work with a couple specific types and classes -- what's so hard about declaring them? I think folks see the gains from type checking, and really have no idea that there are significant costs. Here's a good essay about that: http://www.artima.com/weblogs/viewpost.jsp?thread=4639 A quote from that: So I tried writing some applications in Python, and then Ruby (well known dynamically typed languages). I was not entirely surprised when I found that type issues simply never arose. 3) A point made in that article: some folks have bad memories from C (or Fortran), with type issues. The problem is that they are mistaking weak typing (or no typing!), like you get when you cast a pointer to a new type, with dynamic typing, where the type is checked, just not 'till run time. I used to write Fortran code where you'd pass in references to a procedure that expected certain types, and the compiler wouldn't check anything, it would just merrily go along and use that memory address, which could be total garbage -- that did suck! This is also a good article about the issue (from the Author of Thinking in Java, no less): http://mindview.net/WebLog/log-0066 Here's a choice quote from that one: you bring up an interesting question in suggesting that a dynamically-typed language may require more unit testing than a statically typed language. Of this I am not convinced; I suspect the amount may be roughly the same and if I am correct it implies that the extra effort required to jump through the static type-checking hoops may be less fruitful than we might believe. My way of phrasing that -- you're either testing a given code path or you're not -- if you are not, then you don't know if the code works. If you are, then you're testing the types and the results at the same time -- there's no extra testing required to test the typing. Well, enough written about that! Sorry for the OT
Re: [Matplotlib-users] Labels in a dynamic graph
John Hunter wrote:
On Sun, Mar 23, 2008 at 3:54 AM, Amit Finkler [EMAIL PROTECTED] wrote:
I am using matplotlib to dynamically plot a graph with both my x and y
points taken from a measurement device. That is to say, in each iteration of
my while loop I'm reading two variables which I then want to plot with
matplotlib.
You will want to do something like (this is just a sketch)
xdata = []
ydata = []
fig = figure()
ax = fig.add_subplot(111)
ax.set_xlabel('my xlabel')
ax.set_ylabel('my ylabel')
line, = ax.plot(xdata, ydata)
def add_point(x, y):
xdata.append(x)
ydata.append(y)
if len(xdata)30: # optional, prune the early points
del xdata[0]
del ydata[0]
xmin = xdata[0]
xmax = xdata[-1]
line.set_data(xdata, ydata)
ax.set_xlim(xmin, xmax)
fig.canvas.draw()
while 1:
x,y = get_data_point()
add_point(x, y)
JDH
John,
Thanks for getting back to me. Indeed this works, at least when I try it
line by line. When I inserted it into my module, it shot back some error
message which goes like this:
File
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_tkagg.py,
line 154, in draw
FigureCanvasAgg.draw(self)
File
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py,
line 392, in draw
self.figure.draw(renderer)
File /usr/lib/python2.4/site-packages/matplotlib/figure.py, line
544, in draw
for a in self.axes: a.draw(renderer)
File /usr/lib/python2.4/site-packages/matplotlib/axes.py, line
1004, in draw
try: self.transData.freeze() # eval the lazy objects
ValueError: Domain error on eval_scalars in Transformation::freeze
Since it did work on the console, i.e., line by line, I think it's only
a matter of resolving my own source code, unless of course you think
otherwise. By the way, isn't there a way to do the set_xlim/ylim
automatically? When I use only figure(), hold(False) and plot(X, Y), it
updates it automatically, so why doesn't it do it with the subplot?
Thanks for your help.
Amit.
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Re: [Matplotlib-users] Install problem on Leopard
Hi, On Mar 25, 2008, at 12:23 PM, Christopher Barker wrote: To summarize where we are at with OS-X installer: The binary egg that Charlie built is supposed to work with Python 2.5, either Apple or python.org version on OS-X 10.5, and pythonorg version on OS-X 10.3.9 and 10.4.* However, for some odd reason none of us understand, under some circumstances, easy-install tries to build from source anyway. [snip] I haven't really been following this thread too closely, but I read through it and saw that no body made mention of the superpack? http://trichech.us/?p=5 For a long while now, I've been using python2.4 through macports and installing ipython/numpy/scipy/matplotlib from SVN, but I wanted to just try to use Leopard's Python (quickly ;-). Instead of installing everything from source, I took a stab at d/ling the superpack and it all worked out pretty well for me. The only thing I had to do was to install freetype2 from source (simple ./configure, make, sudo make install) and everything seems to be working. Once I had that in there, I could use matplotlib with the WXAgg backend and it required no additional tweaking. You can give that a go and see if it works. If the numpy/scipy versions fall sufficiently out of data w/o a re- release of the superpack, I reckon you can install those from SVN (and remove the installed eggs) and things should work out fine. -steve - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Labels in a dynamic graph
On Tue, Mar 25, 2008 at 11:39 AM, Amit Finkler [EMAIL PROTECTED] wrote: I am using matplotlib to dynamically plot a graph with both my x and y points taken from a measurement device. That is to say, in each iteration of my while loop I'm reading two variables which I then want to plot with matplotlib. Odd, are you using an older version of matplotlib (it works for me). Try seeding your data with an initial point xdata = [x] ydata = [y] or setting the axis limits before plotting ax.set_xlim(0,1) ax.set_ylim(0,1) Not sure why you are having problems JDH - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
I know. In version 0.90.1 (and earlier) all greek symbols were included in the EPS. Now they are not anymore, and I cannot get any of the options to include them. Does anybody know how to fix this? Mark Date: Tue, 25 Mar 2008 10:43:43 -0400 From: Alan G Isaac [EMAIL PROTECTED] Subject: Re: [Matplotlib-users] can any windows 0.91.2 user reproduce thisbug? To: matplotlib-users@lists.sourceforge.net Message-ID: [EMAIL PROTECTED] Content-Type: TEXT/PLAIN; CHARSET=ISO-8859-1 On Tue, 25 Mar 2008, Jim Vickroy apparently wrote: I loaded the eps file in Adobe Photoshop and the chi letter **was** displayed along the x-axis. -- jv Sounds like perhaps the symbol is not embedded in the EPS file. Cheers, Alan Isaac - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
The *intention* is that the fonts *should* be included (with the exception of ps.useafm == True). That was definitely not a deliberate change. However, as one of the ones who hasn't been able to reproduce this problem, I'm afraid I'm not of much help. From reading the code, I'm still completely stumped as to why the font is not embedded. Someone will have to step through with a debugger on one of the broken systems to figure this out, I'm afraid. All the magic happens in convert_ttf_to_ps, which is C code, called from backend_ps.py. I'd start by seeing if that function is even called, and if not, why... Cheers, Mike Mark Bakker wrote: I know. In version 0.90.1 (and earlier) all greek symbols were included in the EPS. Now they are not anymore, and I cannot get any of the options to include them. Does anybody know how to fix this? Mark Date: Tue, 25 Mar 2008 10:43:43 -0400 From: Alan G Isaac [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] Subject: Re: [Matplotlib-users] can any windows 0.91.2 user reproduce thisbug? To: matplotlib-users@lists.sourceforge.net mailto:matplotlib-users@lists.sourceforge.net Message-ID: [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] Content-Type: TEXT/PLAIN; CHARSET=ISO-8859-1 On Tue, 25 Mar 2008, Jim Vickroy apparently wrote: I loaded the eps file in Adobe Photoshop and the chi letter **was** displayed along the x-axis. -- jv Sounds like perhaps the symbol is not embedded in the EPS file. Cheers, Alan Isaac - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
On Tue, Mar 25, 2008 at 12:02 PM, Michael Droettboom [EMAIL PROTECTED] wrote:
The *intention* is that the fonts *should* be included (with the
exception of ps.useafm == True). That was definitely not a deliberate
change.
However, as one of the ones who hasn't been able to reproduce this
problem, I'm afraid I'm not of much help. From reading the code, I'm
still completely stumped as to why the font is not embedded. Someone
will have to step through with a debugger on one of the broken systems
to figure this out, I'm afraid.
I was able to replicate the bug and find the source of the problem. I
am not 100% sure how to fix it, but someone who knows os.stat better
might. The problem is that matplotlib.cbook.get_realpath_and_stat
class GetRealpathAndStat:
def __init__(self):
self._cache = {}
def __call__(self, path):
result = self._cache.get(path)
if result is None:
realpath = os.path.realpath(path)
stat = os.stat(realpath)
stat_key = (stat.st_ino, stat.st_dev)
result = realpath, stat_key
self._cache[path] = result
return result
get_realpath_and_stat = GetRealpathAndStat()
is returning the same stat ino and dev for all the font files, and
thus the renderer.used_characters dictionary is getting improper keys
-- always (0,0). So the first font in the gate, in this case Vera, is
getting a place in the dict and subsequent fonts (the cm* ones) are
not. The basic problem is that the inode and dev appear to be unix
only.
Michael: if you let me know better what this key is supposed to be
doing (can we not simply use the filename for windows?) then I can
attempt or test some fixes.
JDH
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Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
On Tue, Mar 25, 2008 at 12:50 PM, John Hunter [EMAIL PROTECTED] wrote: result = self._cache.get(path) if result is None: realpath = os.path.realpath(path) stat = os.stat(realpath) stat_key = (stat.st_ino, stat.st_dev) The hackish: if stat_key==(0,0): stat_key = (path, path) does produce a working chi enabled EPS file, FYI JDH - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
Michael Droettboom [EMAIL PROTECTED] writes:
All the magic happens in convert_ttf_to_ps, which is C code, called
from backend_ps.py. I'd start by seeing if that function is even
called, and if not, why...
One possible source of platform-specific issues is
cbook.get_realpath_and_stat, which is used on the font files to obtain
hash keys. Does stat do anything sensible on Windows?
Mark: Could you try applying the following patch to your installed
version of lib/matplotlib/backends/backend_ps.py? There should be no
need to recompile anything. If you don't have a patch utility, just make
a backup of the file, open it in a text editor, find the relevant parts,
and add each line prefixed with + below (omitting the + signs,
naturally). Then run your script and post the output. That should tell
us if the chi character is not even registered as used, or if the bug is
in the embedding code.
Index: backend_ps.py
===
--- backend_ps.py (revision 5020)
+++ backend_ps.py (working copy)
@@ -152,16 +152,22 @@
def track_characters(self, font, s):
Keeps track of which characters are required from
each font.
+print 'track_characters', font, repr(s)
realpath, stat_key = get_realpath_and_stat(font.fname)
+print ' *', realpath, stat_key
used_characters = self.used_characters.setdefault(
stat_key, (realpath, Set()))
used_characters[1].update(s)
+print ' *', used_characters
def merge_used_characters(self, other):
+print 'merge_used_characters'
for stat_key, (realpath, set) in other.items():
+print ' *', stat_key, realpath, set
used_characters = self.used_characters.setdefault(
stat_key, (realpath, Set()))
used_characters[1].update(set)
+print ' *', used_characters
def set_color(self, r, g, b, store=1):
if (r,g,b) != self.color:
@@ -1144,7 +1150,9 @@
for l in d.split('\n'):
print fh, l.strip()
if not rcParams['ps.useafm']:
+print '_print_figure', renderer.used_characters
for font_filename, chars in renderer.used_characters.values():
+print ' *', font_filename, chars
if len(chars):
font = FT2Font(font_filename)
cmap = font.get_charmap()
--
Jouni K. Seppänen
http://www.iki.fi/jks
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Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
[EMAIL PROTECTED] writes: Michael Droettboom [EMAIL PROTECTED] writes: All the magic happens in convert_ttf_to_ps, which is C code, called from backend_ps.py. I'd start by seeing if that function is even called, and if not, why... One possible source of platform-specific issues is cbook.get_realpath_and_stat, which is used on the font files to obtain hash keys. Does stat do anything sensible on Windows? Oh, never mind, John seems to have found the bug in a message that didn't quite make it to my newsreader before I posted. Apparently stat does not do on Windows what this code is expecting it to do. -- Jouni K. Seppänen http://www.iki.fi/jks - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
John Hunter [EMAIL PROTECTED] writes:
Michael: if you let me know better what this key is supposed to be
doing (can we not simply use the filename for windows?) then I can
attempt or test some fixes.
I seem to recall that there was some problem with case-insensitive file
systems. On OS X os.path.realpath doesn't normalize case (some OS X file
systems are case sensitive but the usual one is not):
os.path.realpath
function realpath at 0x474b0
r=_
r('/system/library/fonts/LucidaGrande.dfont')
'/system/library/fonts/LucidaGrande.dfont'
r('/System/Library/Fonts/LucidaGrande.dfont')
'/System/Library/Fonts/LucidaGrande.dfont'
s=os.stat
s('/system/library/fonts/LucidaGrande.dfont')
(33188, 10369L, 234881026L, 1, 0, 0, 2295501L, 1206468480, 1191377895,
1194639447)
s('/System/Library/Fonts/LucidaGrande.dfont')
(33188, 10369L, 234881026L, 1, 0, 0, 2295501L, 1206468480, 1191377895,
1194639447)
Stat is a clever way of finding the real identity of the file on
Unix-like systems. On Windows we clearly need something else...
--
Jouni K. Seppänen
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Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
Hmm... That fix was in there in the first place to work around another Windows (well, case-insensitive filesystem) -related bug, in that occasionally the same font would get included with different paths, and therefore get included twice leading to other Postscript problems. One possible solution is to calculate a hash of the file and key off of that (with an I/O penalty, of course). I vaguely recall that keying off of the Postscript name embedded in the file wasn't good enough. I don't have time to look at this today, but maybe others have some better suggestions anyway. Cheers, Mike - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
Michael Droettboom [EMAIL PROTECTED] writes:
One possible solution is to calculate a hash of the file and key off
of that (with an I/O penalty, of course). I vaguely recall that keying
off of the Postscript name embedded in the file wasn't good enough.
How about checking first the size of the file, assuming that
os.stat('filename').st_size is sensible on Windows? If the size matches
an existing file, compute a hash of the contents of both to see if they
are the same, and in any case, memoize the results so that future checks
of the exact same filename are fast. That way you only incur the cost of
the hash if the same file is included with multiple names, or in the
rare case that two different files have the same size.
--
Jouni K. Seppänen
http://www.iki.fi/jks
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Re: [Matplotlib-users] PNG filesize
Jpeg. On Mar 25, 2008, at 8:12 AM, Einar M. Einarsson wrote: Hi all, I'm trying to find ways to make the file-size of my PNG images smaller. When I generate my 660*440px image I get a big 168kb file. (8bit RGB color model, has an alpha channel (need that) but no interlacing scheme) Here it is: http://metphys.org/eme/T05.png I'm using the savefig method of-course. To see how much I could compress it I used pngcrush (the best tool according to the interwebs) and got it down to 128kb. But thats still way to large for my intended use. (plotting results from an operational weather model, see. www.belgingur.is We are currently using IDL.) From what I've read about PNG files, which is supposed to be rather compact image format, it seems to me that the most effective way is to have an indexed color table. So to cut it short: Is there any way to save a PNG file with an indexed color table? Or do you see any other way to shrink the files? Best regards. Einar M. Einarsson www.belgingur.is - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] can any windows 0.91.2 user reproduce
John -
What you are saying makes sense, because whatever option I give, I always
get Vera included in my eps file but nothing else.
Thanks for looking into this,
Mark
On Tue, Mar 25, 2008 at 6:50 PM, John Hunter [EMAIL PROTECTED] wrote:
On Tue, Mar 25, 2008 at 12:02 PM, Michael Droettboom [EMAIL PROTECTED]
wrote:
The *intention* is that the fonts *should* be included (with the
exception of ps.useafm == True). That was definitely not a deliberate
change.
However, as one of the ones who hasn't been able to reproduce this
problem, I'm afraid I'm not of much help. From reading the code, I'm
still completely stumped as to why the font is not embedded. Someone
will have to step through with a debugger on one of the broken systems
to figure this out, I'm afraid.
I was able to replicate the bug and find the source of the problem. I
am not 100% sure how to fix it, but someone who knows os.stat better
might. The problem is that matplotlib.cbook.get_realpath_and_stat
class GetRealpathAndStat:
def __init__(self):
self._cache = {}
def __call__(self, path):
result = self._cache.get(path)
if result is None:
realpath = os.path.realpath(path)
stat = os.stat(realpath)
stat_key = (stat.st_ino, stat.st_dev)
result = realpath, stat_key
self._cache[path] = result
return result
get_realpath_and_stat = GetRealpathAndStat()
is returning the same stat ino and dev for all the font files, and
thus the renderer.used_characters dictionary is getting improper keys
-- always (0,0). So the first font in the gate, in this case Vera, is
getting a place in the dict and subsequent fonts (the cm* ones) are
not. The basic problem is that the inode and dev appear to be unix
only.
Michael: if you let me know better what this key is supposed to be
doing (can we not simply use the filename for windows?) then I can
attempt or test some fixes.
JDH
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[Matplotlib-users] problems in Inkscape with SVG exported from matplotlib
Hi Everyone, I have a peculiar problem, and I wonder if anyone can assist me. I have two figures generated from matplotlib and saved as svgs. They both print fine, and they load in Inkscape just fine. However, when I copy one figure and paste it into the other, the pasted figure's labels and text become garbled. Screenshots on this page http://assorted-experience.blogspot.com/2008/03/inkscape-matplotlibs-svg-one-strange.html Any suggestions would be most welcome Thanks -Kaushik - Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Multiple Y Axes: Specifying which data coordinates show up in interactive mode...
Hi guys, I can't figure this one out. Look at the example http://matplotlib.sourceforge.net/screenshots/finance_work2.py When I am moving my mouse over the middle subplot which has two Y axes, the data coordinates are for the volume axis, not the candlestick axis. (Presumably because the volume axis was added later...) How do I change which coordinates are shown at the bottom of the interactive window so that it will show me the datapoints from the candlestick axis? Thanks in advance, -Ryan Ryan Wagner [EMAIL PROTECTED] - Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
