matplotlib-users Mailing List for matplotlib

I am unable to set the color of the scatter plot points using the code below:

import matplotlib
matplotlib.use('Qt4Agg') 

import matplotlib.pyplot as plt
import numpy as np

plt.scatter(newSpdVals, newEngLoadVals,c='g',marker='+')
               
#Add the graph title and x/y axis labels 
plt.title("Gear Span")
plt.xlabel("Vehicle Speed (mph)")
plt.ylabel("Engine Load %")    
plt.show()

No matter what I change the c parameter to ('b','r', etc.), the color of the
scatter plot points are always black.  The lists newSpdVals and
newEngLoadVals have 100 dimmensions and are of type numpy.ndarray.

I am using the following software and hardware:

Windows XP
Python 2.7
PyQt4 (I launch the plot from a PyQt GUI.  I don't embed the plot in the
GUI).
matplotlib 1.01

In the beginning of the same function where my scatter plot code is, I added
the following code to verify if the problem is due to the matplotlib/PyQt
interface:

a = np.linspace(-10,100,33)
b = np.linspace(-32,400,33)
plt.scatter(a, b,color='g',marker='+')
plt.title("Gear Span")
plt.xlabel("Vehicle Speed (mph)")
plt.ylabel("Engine Load %")    
plt.show()

The points for this plot are colored green.  I'm able to change the point
color to blue, red, etc.

Any ideas why I can't change the point color of my first graph?  Thank you
for your help.


-- 
View this message in context: http://old.nabble.com/Can%27t-set-scatter-plot-point-color-tp31051071p31051071.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

Zhaoru Zhang <zha...@gm...> writes:

> I created an eps figure file with matplotlib. I can look at it via mac
> preview, but when I inserted it into a word document and printed it
> out, I got nothing except for the eps file information.

It's a long time since I tried using eps files in Word, but I think it
used to only work if you print to a PostScript printer. Does pdf work
better?

-- 
Jouni K. Seppänen
http://www.iki.fi/jks

On Wed, 2 Mar 2011 22:01:02 +0900
Jae-Joon Lee <lee...@gm...> wrote:

> >> > Is this a bug?
> >>
> >> Unfortunately, bbox_inches option is never meant to be complete in
> >> figuring out the exact  size of the figure area.
> >
> > Why not? What's the purpose of bbox_inches='tight' otherwise?
> 
> Figuring out enclosing bbox when arbitrary spline paths are involved
> is difficult (I think there is no exact solution). So I only intended
> to support common cases.

Ok, I can understand that, but shouldn't all artists used to construct the picture, as suptitle, be considered?

> >> However, you  can use "bbox_extra_artists" keyword argument to specify
> >> additional artists that should be considered when dertermining the
> >> plot size.
> >>
> >> mytitle = fig.suptitle("Horray!", fontsize=20)
> >>
> >> ...
> >>
> >> fig.savefig("out.png", bbox_inches='tight', bbox_extra_artists=[mytitle])
> >
> > That doesn't work for me either.
> 
> Can you be more specific? Does it throw an exception? Or the code runs
> without any error but the output is still wrong?

No error/exception are produced. The output is simply identical to the one without bbox_extra_artists.

This also works in my previous example:

import matplotlib as mpl
import matplotlib.figure
import matplotlib.backends.backend_agg

fig = mpl.figure.Figure()
cvs = mpl.backends.backend_agg.FigureCanvasAgg(fig)
fig.set_size_inches((20,20))
plot = fig.add_subplot(111)
plot.set_title("Subtitle")
plot.plot([1,2,3], [3,2,1])
st = fig.suptitle("Horray!", fontsize=20)
fig.savefig("out.png", bbox_inches='tight', bbox_extra_artists=[st])

On Tue, 1 Mar 2011 12:44:20 +0900
Jae-Joon Lee <lee...@gm...> wrote:

> > Is this a bug?
> 
> Unfortunately, bbox_inches option is never meant to be complete in
> figuring out the exact  size of the figure area.

Why not? What's the purpose of bbox_inches='tight' otherwise?

> However, you  can use "bbox_extra_artists" keyword argument to specify
> additional artists that should be considered when dertermining the
> plot size.
> 
> mytitle = fig.suptitle("Horray!", fontsize=20)
> 
> ...
> 
> fig.savefig("out.png", bbox_inches='tight', bbox_extra_artists=[mytitle])

That doesn't work for me either.

Hi,

have you tried to print the EPS without putting it into a DOC? Is
there a specific reason for why you don't use an PNG for that task?
Can Word print EPS at all?

Best,
Daniel

2011/3/1 Zhaoru Zhang <zha...@gm...>:
> Hi,
>
> I created an eps figure file with matplotlib. I can look at it via mac preview, but when I inserted it into a word document and printed it out, I got nothing except for the eps file information. So what's the problem? Here are all the packages I used in the python code. Does any of them impact the creation of the eps file? Thanks.
>
> import numpy as np
> import sys
> import matplotlib.pyplot as plt
> from mpl_toolkits.basemap import Basemap
> from get_fbin import get_fbin
> from matplotlib import mathtext
> from matplotlib import rc
> from matplotlib.font_manager import FontProperties
> rc('font',**{'family':'sans-serif','sans-serif':['Helvetica']})
> rc('text', usetex=True)
>
> and I saved the code in this way:
>
> fig.savefig('pfg1.eps')

On Tuesday, March 1, 2011, Zhaoru Zhang <zha...@gm...> wrote:
> Hi,
>
> I created an eps figure file with matplotlib. I can look at it via mac preview, but when I inserted it into a word document and printed it out, I got nothing except for the eps file information. So what's the problem? Here are all the packages I used in the python code. Does any of them impact the creation of the eps file? Thanks.
>
> import numpy as np
> import sys
> import matplotlib.pyplot as plt
> from mpl_toolkits.basemap import Basemap
> from get_fbin import get_fbin
> from matplotlib import mathtext
> from matplotlib import rc
> from matplotlib.font_manager import FontProperties
> rc('font',**{'family':'sans-serif','sans-serif':['Helvetica']})
> rc('text', usetex=True)
>
> and I saved the code in this way:
>
> fig.savefig('pfg1.eps')
>
>
>
> ------------------------------------------------------------------------------
> Free Software Download: Index, Search & Analyze Logs and other IT data in
> Real-Time with Splunk. Collect, index and harness all the fast moving IT data
> generated by your applications, servers and devices whether physical, virtual
> or in the cloud. Deliver compliance at lower cost and gain new business
> insights. http://p.sf.net/sfu/splunk-dev2dev
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

I have personally have had problems with eps files in MS PowerPoint,
even from matplotlib.  I don't know if it was the files or PowerPoint.
 Try outputting to PDF format and see if that works better.

Ben Root

I tried building the standalone html docs using:

cd doc
python make.py html

I notice that there are around 30 .pyc files left in the 
build/html/pyplots/ directory.  Are these needed in the html 
documentation build directory?

Also, it seems that the files in _images are redundant, as they are 
referenced in their original directory, not _images.

from the build/html directory:

% find . -name multiline.pdf
./_images/multiline.pdf
./plot_directive/mpl_examples/pylab_examples/multiline.pdf
% grep -ri "multiline.pdf" *
examples/pylab_examples/multiline.html:<p>[<a class="reference external" 
href="../../plot_directive/mpl_examples/pylab_examples/multiline.py">source 
code</a>, <a class="reference external" 
href="../../plot_directive/mpl_examples/pylab_examples/multiline.hires.png">hires.png</a>, 
<a class="reference external" 
href="../../plot_directive/mpl_examples/pylab_examples/multiline.pdf">pdf</a>]</p>

Any comments about trimming down the size of the build/html directory?

Thanks,

Jason

Hey guys,

I think I found the answer to my question: No, it is not possible to have a
contour along the grid of a pcolor plot out of the box, because the contour
would take the shortest path between neighbouring same-value-points in a
dataset. Pcolor merely changes the representation of these data.

What I would probably need is using the pcolor plot as an underlying dataset
for a contour plot. If that works I don't know.

To give some background: The data in the attached pdf are not be
interpolated because this would give the fake impression of a continuous
parameter space. This is why I don't want any diagonal lines cutting through
the little boxes in the pcolor plot.

So, if there was a workaround, I would be happy if somebody could point me
to it!

Cheers, Sebastian


S3b4st1an wrote:
> 
> Hello everyone,
> 
> I've got a contour plot on a pcolor plot: 
> 
>  http://old.nabble.com/file/p31038837/m3921-csv-RMSfinalSlip-pleft.pdf
> m3921-csv-RMSfinalSlip-pleft.pdf 
> 
> I would like to have the contours (the 2 black lines) go along the grid
> without any diagonal lines. Is that possible? And if so, could somebody
> please tell me, how?
> 
> Cheers, Sebastian
> 

-- 
View this message in context: http://old.nabble.com/contour-plot-without-smoothing-tp31038837p31046299.html
Sent from the matplotlib - users mailing list archive at Nabble.com.