matplotlib-users Mailing List for matplotlib

It works! Excellent documentation. Thank you John for your help! 
Russ
John Hunter-4 wrote:
> 
> On Sat, May 17, 2008 at 7:18 PM, hvac <hva...@gm...> wrote:
>>
>> Maybe I'm missing it... but how do I change the color of the tick marks?
>> (the actual marks, not the labels).
>>
>> I would like gray tick marks, not black...
> 
> Take a look at the artist API tutorial
> 
> http://matplotlib.sourceforge.net/pycon/artist_api_tut.pdf
> 
> which covers all the main objects in the matplotlib figure and how to
> customize them. The final two sections "The Axis containers" and
> "The Tick containers" will be particularly useful. Here is an example
> which sets some properties on the yaxis tick lines:
> 
> for line in ax.yaxis.get_ticklines():
> # line is a matplotlib.lines.Line2D instance
> line.set_color('green')
> line.set_markersize(25)
> line.set_markeredgewidth(3)
> 
> JDH
> 
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On Sun, May 18, 2008 at 4:18 PM, Eric Firing <ef...@ha...> wrote:
> There is nothing standard for this, and you would have to define more
> precisely what you mean by the Z data; what kind of interpolation do you
> want?
>
> This type of request has come up before, and I suspect John may have
> provided an illustration of how to do it in reply to some earlier such
> request, but I don't have any specific pointers.
The question has come up but I don't think I've ever provided a basic
one here, which assumes nearest neihor interpolation and no image
"extent" setting, but it would be fairly easy to generalize to handle
extent:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.cm as cm
X = 10*np.random.rand(5,3)
fig = plt.figure()
ax = fig.add_subplot(111)
ax.imshow(X, cmap=cm.jet, interpolation='nearest')
numrows, numcols = X.shape
def format_coord(x, y):
 col = int(x+0.5)
 row = int(y+0.5)
 if col>=0 and col<numcols and row>=0 and row<numrows:
 z = X[row,col]
 return 'x=%1.4f, y=%1.4f, z=%1.4f'%(x, y, z)
 else:
 return 'x=%1.4f, y=%1.4f'%(x, y)
ax.format_coord = format_coord
plt.show()
BTW, it appears there are occasional pixel border errors for some
images that I first noticed when playing with this example -- for
example, the image buffer is not filled all the way to the right in
the example code.

There is nothing standard for this, and you would have to define more 
precisely what you mean by the Z data; what kind of interpolation do you 
want?
This type of request has come up before, and I suspect John may have 
provided an illustration of how to do it in reply to some earlier such 
request, but I don't have any specific pointers.
Eric
Ryan Dale wrote:
> When I create a plot with contourf(X,Y,Z) the X and Y data are displayed 
> in text (as usual) in the lower right-hand corner of the figure window. 
> Is there a way to report the Z data as well?
> 
> thanks,
> -Ryan

I'm using matplotlib 0.91.2 on os x 10.5.2, and on all the animation 
examples i've tried, I don't actually see any animation. The window 
launches, the wheel spins and then either:
1. I only see the last frame of the animation, if the script leaves 
it up
2. I don't see anything, and the script quits successfully. For 
instance, if I run the anim.py example, I get the FPS count.
-gideon

When I create a plot with contourf(X,Y,Z) the X and Y data are displayed 
in text (as usual) in the lower right-hand corner of the figure window. 
 Is there a way to report the Z data as well?
thanks,
-Ryan

On Sat, May 17, 2008 at 7:18 PM, hvac <hva...@gm...> wrote:
>
> Maybe I'm missing it... but how do I change the color of the tick marks?
> (the actual marks, not the labels).
>
> I would like gray tick marks, not black...
Take a look at the artist API tutorial
 http://matplotlib.sourceforge.net/pycon/artist_api_tut.pdf
which covers all the main objects in the matplotlib figure and how to
customize them. The final two sections "The Axis containers" and
"The Tick containers" will be particularly useful. Here is an example
which sets some properties on the yaxis tick lines:
for line in ax.yaxis.get_ticklines():
 # line is a matplotlib.lines.Line2D instance
 line.set_color('green')
 line.set_markersize(25)
 line.set_markeredgewidth(3)
JDH

Maybe I'm missing it... but how do I change the color of the tick marks? 
(the actual marks, not the labels).
I would like gray tick marks, not black... 
Thank you... Russ
 http://www.nabble.com/file/p17297888/graph.jpg 
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