Re: [sage-support] Re: help with filtering between two lists.
On Jan 3, 2012 3:51 PM, "Volker Braun" wrote: > > Lets face it, constructing a million 2d shapes is always going to be slow. If you create a PDF then it will be multiple megabytes and it will stress-test your PDF viewer. Might also be a challenge to print. Not impossible, but not very handy either. For example, here is a plot that contains about 120k points that I did a few days ago using matplotlib (that is, not using Sage's 2d plotting but directly constructing a matplotlib figure): > > http://www.stp.dias.ie/~vbraun/t/points_120k.pdf > > Now you want more than an order of magnitude more points. > > The only fast way would be to construct a bitmap directly, and avoiding vector graphics. You can easily find examples of constructing bitmaps from numpy arrays, say, if you ask Google. > The visualize_structure matrix method that Martin Albrecht wrote creates png's directly.Maybe you can use the method on a sage matrix to somehow solve your problem? > > -- > To post to this group, send email to sage-support@googlegroups.com > To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com > For more options, visit this group at http://groups.google.com/group/sage-support > URL: http://www.sagemath.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
I will be printing it out on a plotter D size paper so it should be big enough. On Jan 3, 12:51 pm, Volker Braun wrote: > Lets face it, constructing a million 2d shapes is always going to be slow. > If you create a PDF then it will be multiple megabytes and it will > stress-test your PDF viewer. Might also be a challenge to print. Not > impossible, but not very handy either. For example, here is a plot that > contains about 120k points that I did a few days ago using matplotlib (that > is, not using Sage's 2d plotting but directly constructing a matplotlib > figure): > > http://www.stp.dias.ie/~vbraun/t/points_120k.pdf > > Now you want more than an order of magnitude more points. > > The only fast way would be to construct a bitmap directly, and avoiding > vector graphics. You can easily find examples of constructing bitmaps from > numpy arrays, say, if you ask Google. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
Lets face it, constructing a million 2d shapes is always going to be slow. If you create a PDF then it will be multiple megabytes and it will stress-test your PDF viewer. Might also be a challenge to print. Not impossible, but not very handy either. For example, here is a plot that contains about 120k points that I did a few days ago using matplotlib (that is, not using Sage's 2d plotting but directly constructing a matplotlib figure): http://www.stp.dias.ie/~vbraun/t/points_120k.pdf Now you want more than an order of magnitude more points. The only fast way would be to construct a bitmap directly, and avoiding vector graphics. You can easily find examples of constructing bitmaps from numpy arrays, say, if you ask Google. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
On Jan 3, 11:43 am, Eric Kangas wrote: > well I have 2 million data points, and would like to have each one of > them a different color. Wow, I have trouble getting this to show up in a reasonable amount of time. 2 million is a LOT. R = rainbow(10^6) also takes a long time. What I'd do is something like L = [(random(),random()) for i in range(10^6)] # random data so it just fills up the unit square, I'm lazy sum([point(L[i],color=R[i]) for i in range(10^6)]) but I bet this would take a LONG time. I'm trying it now and it still hasn't finished... In any case, your monitor may not be able to resolve 10^6 colors, and your eyes almost certainly can't (?). Does anyone have a sense of what a "reasonable" and *fast* way to do something like this would be? What are we really looking for here? - kcrisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: coeffs cannot handle a general function
On 01/03/2012 12:16 PM, Yi Wang wrote: Thanks a lot for creating the ticket! But in 4.7.0 coeffs doesn't work either. Because sage: f.coeffs(g) [[g(t)^2 + t + 3*g(t), 0]] is a wrong result for f = 3*g + g**2 + t. I expect a result [[t, 0], [3, 1], [1, 2]]. It would be very kind of you to update the ticket about it. I am new here and I am not sure whether I can edit the ticket myself. Thank you again! Oh, sorry, I didn't look very hard at the output, just that it didn't throw an error. I've updated the ticket. If you're interested, anyone can request an account (instructions are on the trac homepage[1]) and that would allow you to create/modify tickets. [1] http://trac.sagemath.org/sage_trac/ -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: coeffs cannot handle a general function
Thanks a lot for creating the ticket! But in 4.7.0 coeffs doesn't work either. Because sage: f.coeffs(g) [[g(t)^2 + t + 3*g(t), 0]] is a wrong result for f = 3*g + g**2 + t. I expect a result [[t, 0], [3, 1], [1, 2]]. It would be very kind of you to update the ticket about it. I am new here and I am not sure whether I can edit the ticket myself. Thank you again! On Jan 3, 11:23 am, Michael Orlitzky wrote: > On 01/03/2012 10:48 AM, Yi Wang wrote: > > > Hi, > > > I found coeffs does not work with a general function. It would be of > > great help for me to have it fixed. Thank you! > > I created a ticket for this, > > http://trac.sagemath.org/sage_trac/ticket/12255 > > You should be able to CC yourself and be notified of any progress. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
well I have 2 million data points, and would like to have each one of them a different color. On Jan 3, 8:39 am, kcrisman wrote: > On Jan 3, 11:19 am, Eric Kangas wrote: > > > Also I have been trying to get list_plot to create a rainbow effect, > > but I am not sure how to go about it. Looked for possible coding and > > couldn't find any. > > Can you be more specific about what you'd like? We do have the > rainbow() function for a range of hues, which (perhaps?) would work > with this... -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
well I have 2 million data points, and would like to have each one of them a different color. On Jan 3, 8:39 am, kcrisman wrote: > On Jan 3, 11:19 am, Eric Kangas wrote: > > > Also I have been trying to get list_plot to create a rainbow effect, > > but I am not sure how to go about it. Looked for possible coding and > > couldn't find any. > > Can you be more specific about what you'd like? We do have the > rainbow() function for a range of hues, which (perhaps?) would work > with this... -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
well I have 2 million data points, and would like to have each one of them a different color. On Jan 3, 8:39 am, kcrisman wrote: > On Jan 3, 11:19 am, Eric Kangas wrote: > > > Also I have been trying to get list_plot to create a rainbow effect, > > but I am not sure how to go about it. Looked for possible coding and > > couldn't find any. > > Can you be more specific about what you'd like? We do have the > rainbow() function for a range of hues, which (perhaps?) would work > with this... -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
On Jan 3, 11:19 am, Eric Kangas wrote: > Also I have been trying to get list_plot to create a rainbow effect, > but I am not sure how to go about it. Looked for possible coding and > couldn't find any. > Can you be more specific about what you'd like? We do have the rainbow() function for a range of hues, which (perhaps?) would work with this... -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] coeffs cannot handle a general function
On 01/03/2012 10:48 AM, Yi Wang wrote: Hi, I found coeffs does not work with a general function. It would be of great help for me to have it fixed. Thank you! I created a ticket for this, http://trac.sagemath.org/sage_trac/ticket/12255 You should be able to CC yourself and be notified of any progress. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: help with filtering between two lists.
Also I have been trying to get list_plot to create a rainbow effect, but I am not sure how to go about it. Looked for possible coding and couldn't find any. On Jan 2, 1:22 pm, Anton Sherwood wrote: > On 2012-1-02 09:24, Eric Kangas wrote: > > > l1 = [int(x) for x in p] > > l2 = [int(x) for x in d] > > l3 = [] > > x = 0 > > for x in l1,l2: > > This will give x the values l1 and l2, > which are not valid indices. > > > if l1[x:x+1]==l2[x:x+1]; > > l3.insert(x, (x,l1[x:x+1],l2[x:x+1])); > > Why ranges (which are lists) rather than simple items? > Why record two numbers that are always equal (or else unrecorded)? > > Is "l3.insert(x, ...)" valid when len(l3) < x? > > Others have suggested how to do it with a one-liner. > Here's better syntax for the 'naive' approach: > > for x in range(min(len(l1),len(l2)): > if l1[x] == l2[x]: > l3.append((x,l1[x])) > print l3 > > -- > Anton Sherwood *\\*www.bendwavy.org*\\*www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] coeffs cannot handle a general function
Hi,
I found coeffs does not work with a general function. It would be of
great help for me to have it fixed. Thank you!
I tested 4.7.0, 4.7.2 and 4.8.0alpha5. None of them work, though 4.7.0
gives slightly different result:
# the following is result of 4.7.2 and 4.8alpha5.
sage: g = function('g', var('t'))
sage: f = 3*g + g**2 + t
sage: f.coeff(g)
3
sage: f.coeffs(g)
---
ValueErrorTraceback (most recent call last)
/home/wangyi/ in ()
/opt/sage/local/lib/python2.6/site-packages/sage/symbolic/expression.so
in sage.symbolic.expression.Expression.coefficients
(sage/symbolic/expression.cpp:19003)()
/opt/sage/local/lib/python2.6/site-packages/sage/symbolic/ring.so in
sage.symbolic.ring.SymbolicRing.var (sage/symbolic/ring.cpp:6342)()
/opt/sage/local/lib/python2.6/site-packages/sage/symbolic/ring.so in
sage.symbolic.ring.SymbolicRing.var (sage/symbolic/ring.cpp:6069)()
ValueError: The name "g(t)" is not a valid Python identifier.
# the following is the result of 4.7.0
sage: f.coeffs(g)
[[g(t)^2 + t + 3*g(t), 0]]
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[sage-support] Re: plots in 3d are not published?
Thank-you for all the replies! I appreciate all the help.
== 2d plots are generated with jmol in the published worksheets;
== 3d plots are NOT generated.
== (If possible) I want my user/viewer to be able to view the
published worksheet without having to install anything (except be java
enabled).
@kcrisman and William Stein
I tried:
var('x y z')
plane1=implicit_plot3d(x+y==1,(x, -1, 1), (y, -1,1), (z,
-1,1),color='blue', opacity=.3)
plane1.show(viewer='tachyon')
and nothing plotted on my worksheet (or in the published version).
Also - how would I show more than one plot?
Thank-you again, Linda
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