matplotlib-users Mailing List for matplotlib

Hi,
When I make a scatter plot where the y-axis is logarithmic I expected that
points where the logarithm is not defined (0 and negative values) are
skipped (as for the plot function). But it seems that the scatter plot
assignes a value of 1e-1. So in that respect plot(x,1) and scatter (x,y)
behave differently. Is that intended or a bug? If intended, can I set the
value different than 1e-1?
For illustration I've attached a python script that shows the different
behaviour.
- Marcel
BTW: I'm using Matplotlib 0.99.1.1
http://old.nabble.com/file/p31289230/scatter_plot_bug.py scatter_plot_bug.py 
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On 03/31/2011 01:33 AM, Mike Kaufman wrote:
> how does one turn on gridlines for just the x-ticks or just the yticks?
> grid() just seems to do major or minor for both at the same time.
import matplotlib.pyplot as plt
plt.plot([1,2,3,2,1])
ax = plt.gca()
ax.xaxis.grid(True)
plt.draw()
>
> M
>
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I was thinking if its possible to shade depending on time. For
example, shade yellow for 7:00AM to 5:00PM and then leave it
white/normal for the rest of the graph. Does anyone have any example
of using axvspan? Or is there an alternative?

how does one turn on gridlines for just the x-ticks or just the yticks?
grid() just seems to do major or minor for both at the same time.
M

On 3/31/11 3:32 AM, T J wrote:
> Any chance matplotlib can get functionality similar to GraphicsArray
> in Mathematica? It'd be nice to make a single method to draw whatever
> you want and then do this in a list comprehension. At the end, you
> can arrange all those plots however you want.
>
> It looks like Sage has implemented something like this (built on top
> of matplotlib, I presume). Would it be difficult to port this to
> "pure" matplotlib?
>
> http://ask.sagemath.org/question/308/can-i-convert-a-graphicsarray-object-to-a-graphics
Sage does indeed have a (somewhat crufty) GraphicsArray object [1], 
which I've been meaning to convert to use the new GridSpec functionality 
[2]. It is built on top of matplotlib, but the code is fragile and easy 
to "break". See 
http://doxdrum.wordpress.com/2010/08/12/graphics-array-in-sagemath/, for 
example.
One thing that would be really nice in GridSpec is if we could plot 
things recursively. As I understand it right now, using GridSpec, we 
can arrange a bunch of axes in a grid. However, what if we wanted to 
put a grid inside of one of the spots in the grid? (I think the same 
question is: what if we wanted to embed a figure inside another axes?)
Jason
[1] 
http://www.sagemath.org/doc/reference/sage/plot/plot.html#sage.plot.plot.graphics_array
[2] http://matplotlib.sourceforge.net/users/gridspec.html; 
http://matplotlib.sourceforge.net/api/gridspec_api.html

Any chance matplotlib can get functionality similar to GraphicsArray
in Mathematica? It'd be nice to make a single method to draw whatever
you want and then do this in a list comprehension. At the end, you
can arrange all those plots however you want.
It looks like Sage has implemented something like this (built on top
of matplotlib, I presume). Would it be difficult to port this to
"pure" matplotlib?
 http://ask.sagemath.org/question/308/can-i-convert-a-graphicsarray-object-to-a-graphics

On 03/30/2011 01:32 PM, Nat Echols wrote:
> I wanted to display a line plot with rainbow coloring based on the
> y-value, similar to what's possible for surface plots. However, the
> 'plot' method does not appear to accept a 'cmap' argument. The closest
> thing I was able to find was a recipe for different colored line
> segments on the SciPy examples page
> (http://www.scipy.org/Cookbook/Matplotlib/MulticoloredLine), but that's
> not really what I want - I was hoping for a continuous gradient over
> hundreds (possibly thousands) of points on a line. Is this possible
> without too much hacking?
I don't think there is anything better than the second example here:
http://matplotlib.sourceforge.net/examples/pylab_examples/multicolored_line.html
Eric
>
> thanks,
> Nat