Re: [Matplotlib-users] save or pickle figure object
I agree completely - I was just pointing that it is possible. I think what people might not be aware of is that it's really an all or nothing proposition. You either jump in completely and pay the large cost to handle this in a maintainable, scalable way or don't do it at all. All of the quick and easy solutions have too many problems and aren't really maintainable. Ted -Original Message- From: Eric Firing [mailto:[EMAIL PROTECTED] Sent: Wednesday, September 17, 2008 12:01 PM To: Ted Drain Cc: matplotlib-users@lists.sourceforge.net Subject: Re: [Matplotlib-users] save or pickle figure object Ted Drain wrote: We have some experience maintaining persistent object storage over long periods of time. The best solution we've found is to do something like this: - create a read/write method on each class. Every class that needs to be stored must have this. This includes class you would store (eg Figure) and things that are member variables of those classes. - Each class stores a version number along with it's data which represents the version of the persistent representation for that class. So each class has its own, internal versioning scheme that represents a specific set of variables with specific types. - The read method on each class must check the version number and then read the appropriate data for that version of itself. Whenever the persistent representation of the class changes (usually if the member variables change), you increment the version number. Implicit in this is that if you change the member variables of a class, the class read method must be able to convert the variables that existed in the older version of itself into the new member variables (since that's what the new methods on that class will be using) FYI It is possible to use pickle to do this but you can't rely on pickle to automatically save the member dictionary. You need to implement __getstate__ and __setstate__ and have them incorporate a version number in the dictionary they return. In addition, you shouldn't blindly save every member variable. If member variables can be constructed in terms of other data, it may be better to store that data and then reconstruct the member variables in the __setstate__ method. Using this type of system, you get a hierarchy of objects that each have their own, internal versioning system. This lets you make changes to a single class, increment it's version, and update its save/load methods and it won't affect any other part of the system and still retains backwards reading capability. Ted Sounds good--for some applications--but I would strongly oppose adding this additional level of complexity to mpl. It's just not worth it. If you want to be able to work with a plot, then generate it with a script, and save the data and the script. That is the user's responsibility, not mpl's. Unless mpl is taken over by a cadre of full-time professional programmers, we have to try to keep it accessible to people who can only work on it sporadically. That means we need to try to keep it simple--indeed, to work on simplifying it and cleaning up the rough edges, and to work on maintaining a design that makes it easy to improve the real plotting capabilities and ease-of-use. Eric -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Firing Sent: Tuesday, September 16, 2008 7:04 PM To: John Hunter Cc: Josef Koller; matplotlib-users@lists.sourceforge.net Subject: Re: [Matplotlib-users] save or pickle figure object John Hunter wrote: On Tue, Sep 16, 2008 at 5:06 PM, Josef Koller [EMAIL PROTECTED] wrote: Hi folks, I would like to save preliminary figures for later processing and refinement with matplotlib. Is there a way to save or pickle a figure object and later reload it. Matlab has a feature like that and and I was wondering if matplotlib has it too. No, it doesn't exist. We've taken a stab at it once or twice, but have been stymied because we make extensive use of a python extension libray CXX, and these objects have resisted our attempts to pickle them. With our recent transforms refactoring, which removes the hairiest CXX dependency, it may be worth taking another look, but noone is currently working on it. My sense, based on very little experience, is that pickles of complicated objects are very fragile, so even if we could pickle figures, I fear it might cause more trouble (I can't load this absolutely critical figure I pickled 6 months ago) than it would be worth. Eric --- -- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two
Re: [Matplotlib-users] Toolbar in QT
The toolbar is just a widget so you can do that the same way you show any other widget in Qt. Something along the lines of: - build a widget - add a layout - add the figure widget to the layout - add the toolbar to the layout - connect them together (I forget exactly how but backend_qt.py has all the code that does this) From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Behnam Kamrani Sent: Thursday, May 08, 2008 11:19 AM To: matplotlib-users@lists.sourceforge.net Subject: [Matplotlib-users] Toolbar in QT Hi, First I want to thanks for this amazing Matplotlib. It's fantastic! My newbie question is how I can show the (zoom, pan, etc) toolbar in embedding_in_qt.py example? I have noticed that in animation_blit_qt.py the toolbar is available, but it seems to be done in a different way. Appreciate your help! Thank you, /Ben - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] PNG filesize
I'd guess PNG won't get much smaller because you have a lot of different colored pixels. PNG compresses most when you have a sparser plot. I'd suggest that you try using JPG. It will compress the multi-colored portion of your plot way down. You may see a few artifacts if you look carefully at the axes: instead of pixels white,black,white you might get white,grey,black,grey,white. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Einar M. Einarsson Sent: Monday, March 17, 2008 5:08 AM To: matplotlib-users@lists.sourceforge.net Subject: [Matplotlib-users] PNG filesize 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] Efficient scatter() w/ markers from plot()?
Thanks! I had originally just tried it (ignoring the docs) but my plot just showed dots instead of markers for both 'x' and '+'. Then I read the docs which seemed to indicate they wouldn't work. Late last night I was digging through axes.py and noticed that they should be supported (and I found the scatter example that uses them). My problem was that the point scale input needed to be 3-4 times larger than the default value for the marker to be visible. Once I changed that, everything worked fine. Thanks for the doc patch - that will help everyone else in the future... Ted -Original Message- From: Manuel Metz [mailto:[EMAIL PROTECTED] Sent: Thursday, March 20, 2008 1:13 AM To: Ted Drain Cc: matplotlib-users@lists.sourceforge.net Subject: Re: [Matplotlib-users] Efficient scatter() w/ markers from plot()? Ted Drain wrote: I need to efficiently plot a set of x,y points where each point has a different color. I tried multiple calls to plot() with a single point each but that is way too slow. I switched to using scatter() and passing in a list of colors which works great. However, I'd really like to have the marker options from plot() (things like '+' and 'x') which don't work w/ scatter. What's the easiest way to get the markers from plot() with the efficiency (and multi-colors) from scatter? Thanks, Ted Hi Ted, oh - you can use '+' and 'x' and many more markers with scatter. It's unfortunately just not documented in the current release but is fixed in the repository. pylab.scatter(x,y, marker=(4,2)) gives a '+', and pylab.scatter(x,y, marker=(4,2,math.pi/4.)) gives a 'x'. The logic is a follows: marker(numside, type, angle) numside is the number of edges, i.e. 4 for a plus or a cross. type : 0 - a filled symbol, 1 - a star-like symbol, 2 - a asterisk like symbol angle: the symbol gets rotated by this angle So in principle with this you can produce an endless number of different markers... :-) Manuel -- --- Manuel Metz [EMAIL PROTECTED] Argelander Institut fuer Astronomie Auf dem Huegel 71 (room 3.06) D - 53121 Bonn E-Mail: [EMAIL PROTECTED] Web:www.astro.uni-bonn.de/~mmetz Phone: (+49) 228 / 73-3660 Fax:(+49) 228 / 73-3672 --- - 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] Efficient scatter() w/ markers from plot()?
I need to efficiently plot a set of x,y points where each point has a different color. I tried multiple calls to plot() with a single point each but that is way too slow. I switched to using scatter() and passing in a list of colors which works great. However, I'd really like to have the marker options from plot() (things like '+' and 'x') which don't work w/ scatter. What's the easiest way to get the markers from plot() with the efficiency (and multi-colors) from scatter? Thanks, Ted - 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] Create powerpoint slide and/or presentation from script?
Thanks! Is econpy still under development? -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alan G Isaac Sent: Monday, February 11, 2008 10:00 AM To: matplotlib-users@lists.sourceforge.net Subject: Re: [Matplotlib-users] Create powerpoint slide and/or presentation from script? On Mon, 11 Feb 2008, Ted Drain apparently wrote: Does anyone know of a way to create a powerpoint slide from a plot? URL:http://code.google.com/p/econpy/source/browse/trunk/utilities/mso. py hth, 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 - 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] Create powerpoint slide and/or presentation from script?
Does anyone know of a way to create a powerpoint slide from a plot? I'm assuming that it's possible to have a script that savse a PNG of the plot and then use a VB (or preferably python) script to create a slide (or append that slide to an existing presentation). I've google'ed around but I'm having trouble finding a decent example of doing this on the web. Any examples would be greatly appreciated. Thanks, Ted - 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] Basemap:'snapback' on line crossing global plot edge
I don't think so. We always manually check for horizontal and vertical axis crossings and split the line as many times as necessary. At 03:31 PM 8/2/2007, James Boyle wrote: This is probably for Jeff but maybe someone else has an answer. If I plot a satellite orbit on the globe when the groundtrack passes the edge of the map - in this case the Greenwich meridian - the line 'snaps back ' across the plot where the line picks up on the other side of the globe. The attached plot shows the problem, note the line across the northern polar regions. I have encountered this before. In this case I can break the ground track into two segments, one up to and including Greenwich and the other from Greenwich eastward. My question: Is there a more elegant way to deal with this situation in Basemap? I have a nagging feeling that Jeff has addressed this issue but I cannot find anything in the examples. --Jim - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Replotting inside a while loop
See the docs on interactive mode... http://matplotlib.sourceforge.net/interactive.html At 10:39 AM 1/23/2007, Tommy Grav wrote: On Jan 23, 2007, at 1:28 PM, Darren Dale wrote: On Tuesday 23 January 2007 13:20, Tommy Grav wrote: I have a program that enters a while loop, calculates a bunch of arrays and then plots a figure. The user then looks at the figure and is asked wether the result is ok. If the answer is no, then the calculations are redone and the figure replotted. If the answer is yes then it exits the loop. import pylab as p end = False while not end: (x,y,z) = calculate_arrays() figure(1) subplot(211) plot(x,z) subplot(212) plot(x,y) draw() end = confirm(is the plot ok?) clf() However using the draw() command does not display the figure. How do I do this? try show() While show() does display the figure it does not work for me as it will lock up the script, so it never makes it to the end = confirm() line. Cheers Tommy - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] 2D Intensity Plots of Titan
matplotlib+basemap may do it for you. I'm not sure how much of it's hard coded for the Earth though... http://www.scipy.org/Cookbook/Matplotlib/Maps At 08:49 AM 7/12/2006, Jeff Sadino wrote: I am trying to map the surface of Saturn's largest moon, Titan for a summer research project. As a rough draft, I would like to plot the temperature (colored red) at the longitude(x) and latitude(y) coordinates. My data file is tab delimited in three columns (x,y,T). I am also missing some x,y locations, which I would like to leave blank. As a final report, I would like the data point to be able to take on different geometries (circle, hexagon, arbitrary shape, etc) and different sizes as well as be able to overlap with neighboring data points. Finally, I would like to be able to plot this not on a rectangular cartesion coordinate system, but on a planetographic (global projection) coordinate system. I've spent two days trying everything from gnuplot, matlab, matplotlib and others trying to do this, but to no avail. Any suggestions would be very welcomed. - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users Ted Drain Jet Propulsion Laboratory [EMAIL PROTECTED] - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
