matplotlib-users Mailing List for matplotlib

Darren Dale <dd...@co...> wrote: On Friday 14 September 2007 02:19:35 pm fatuheeva wrote:
> Hello,
> I can successfully change the facecolor in a figure but when I try and save
> it to a file (jpg or png) the color goes away - the rest of the plot
> remains only the facecolor reverts to white. I have tried using GTK and
> GTKAgg. I have also tried changing the 'savefig' value in the RC file -
> though I'm not sure this is relevant because I'm not using the savefig
> command. So far nothing is working. Any ideas? Thanks,
There is a savefig rc parameter for setting the face color when saving, which 
is probably overriding your changes.
Darren,
Thanks for the quick reply but I have tried changing the savefig parameter in the rc file and it makes no difference.
Mike
 
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On Friday 14 September 2007 02:19:35 pm fatuheeva wrote:
> Hello,
> I can successfully change the facecolor in a figure but when I try and save
> it to a file (jpg or png) the color goes away - the rest of the plot
> remains only the facecolor reverts to white. I have tried using GTK and
> GTKAgg. I have also tried changing the 'savefig' value in the RC file -
> though I'm not sure this is relevant because I'm not using the savefig
> command. So far nothing is working. Any ideas? Thanks,
There is a savefig rc parameter for setting the face color when saving, which 
is probably overriding your changes.

Hello,
I can successfully change the facecolor in a figure but when I try and save it to a file (jpg or png) the color goes away - the rest of the plot remains only the facecolor reverts to white. I have tried using GTK and GTKAgg. I have also tried changing the 'savefig' value in the RC file - though I'm not sure this is relevant because I'm not using the savefig command. So far nothing is working. Any ideas?
Thanks,
Mike
 
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Hello,
I noticed, that bar() with log=3DTrue plots very strange graphs. In fact,
the bars in this case grow from the bottom of the graph (I guess from
the value of log(+0), i.e. -=E2=88=9E). This way the relative height of the=
 bars
says almost nothing about the value of data, because the bars are
higher, the lower is ylim()[0]. It is hard to distinguish data values
above and below 1 (positive and negative log).
I think that in many situations it is more useful to base bars on
the level of log(y)=3D0. This is achievable with manual log-scaling of
data, yet in this case it also requires manual tuning of ylabels.
I attach a script and an image which show the default plotting in
comparison to grow-from-log(1) plotting to see the difference, and
suggest making it possible to change the level from which the bars grow.
Best regards,
jetxee

Christian Meesters <mee...@un...>
writes:
> is it somehow possible to have a hatch in parts of the background, which
> would achieve something like this pseudo-parameter to axvspan
> pylab.axvspan(2, 10, hatch='//')?
Do you mean something like this?
In [34]: phi=pi*array((0,.2,.4,.6,.8,1,-.8,-.6,-.4,-.2))
In [35]: fill(cos(phi), sin(phi))
Out[35]: [<matplotlib.patches.Polygon instance at 0x1894cda0>]
In [36]: a=gca()
In [37]: setp(getp(a,'frame'), hatch='//')
Out[37]: [None]
(For some reason I don't see the hatch pattern in Agg-based backends, in
current svn, but it is there in e.g. eps and pdf.)
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

James Boyle <bo...@ll...> writes:
> I have not been able to figure out how to just make the first and 
> last ytick labels vanish. [...]
> I thought that the following might work but this just makes all the 
> labels disappear - my understanding is incomplete.
> ytl = a.get_yticklabels()
> ytl[0]._visible = False
> ytl[-1]._text = False
It is usually a bad idea to manipulate directly anything starting with
an underscore -- that's a Pythonic way of indicating a "private"
variable. The set_visible() method should work here:
ytl = a.get_yticklabels()
ytl[0].set_visible(False)
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

> You want legend((bar1[0],bar2[0]), ('First','Second')). What happened
> was that matplotlib made a legend entry for two of the blue bars in
> bar1; it would have made six entries, but stopped because you only gave
> it two labels.
>
> 
Dear Jouni,
thanks for all the answers.
Gianluca

Gianluca Santarossa
<gia...@ch...> writes:
> In this example, on my PC both the entries in the legend appear in blue 
> color:
> legend((bar1,bar2), ('First','Second'))
You want legend((bar1[0],bar2[0]), ('First','Second')). What happened
was that matplotlib made a legend entry for two of the blue bars in
bar1; it would have made six entries, but stopped because you only gave
it two labels.
> Moreover, if I add a legend to a graph plotting a set with marks and 
> without lines, the legend will show two points instead of one (which 
> would have been the expected behaviour). Is this correct?
I get four points, not two, but perhaps this has changed in the svn
version. At least in the svn version you can control the number of
points with the numpoints keyword argument:
In [6]: plot([3,1,4,1,5,9,2,6,5,3,5],'bo')
Out[6]: [<matplotlib.lines.Line2D instance at 0x16cf9b98>]
In [7]: legend(_, ('foo',), numpoints=1)
Out[7]: <matplotlib.legend.Legend instance at 0x16cf9bc0>
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Dear all,
I am an unexperienced matplotlib user, and I have a couple of questions 
about adding a legend to a graph.
In this example, on my PC both the entries in the legend appear in blue 
color:
#!/usr/bin/env python
import numarray as na
from pylab import *
labels = ["A", "B", "C"]
first = [ 1, 2, 3 ]
second = [ 3, 2, 1 ]
xlocations = na.array(range(len(labels)))+0.33
width = 0.33
bar1=bar(xlocations, first, width=width, color='blue')
bar2=bar(xlocations+.33, second, width=width, color='red')
legend((bar1,bar2), ('First','Second'))
show()
Did I make some mistake?
Moreover, if I add a legend to a graph plotting a set with marks and 
without lines, the legend will show two points instead of one (which 
would have been the expected behaviour). Is this correct?
Thank in advance,
Gianluca

On 13/09/2007, Alan G Isaac <ai...@am...> wrote:
> http://matplotlib.sourceforge.net/matplotlib.pylab.html#-plot_date
Thanks, that's helpful and has given me a push in the right direction.
I've got a rough code producing the plot I need - just need to clean
it up now.
Cheers
Adam

Also in the examples, there is date_demo1.py...
(And others.)
Cheers,
Alan Isaac

http://matplotlib.sourceforge.net/matplotlib.pylab.html#-plot_date
hth,
Alan Isaac

Hi
I need to produce a line plot of some data against the date in ISO
format, i.e. the data is something like:
20060412 546
20060413 547
20060414 657
20060415 438
...
I've been looking at the examples and can't find anything appropriate.
 As far as I can tell from the documentation I need to read in the
date and use date2num to convert the date into matplotlibs internal
format for representing dates... but I'm not sure - is this the
correct approach?
Is there any example code that I'm missing that plots data against the date?
Cheers
Adam

Hi,
I have a histogram with orders of magnitude difference in counts of each
bin. I want to use a log yscale in plotting it. But there are bins with 0
counts. What's the best way to plot it? I've read the log_bar.py example
which uses bar() for plotting. It works when I pull it into a script. But
I'd appreciate any pointers to better ways.
Thanks,
Ping