On 01/24/2011 02:49 PM, Lionel (Lee) Brooks 3rd wrote:
> Hello Gentlepeople,
>
> I am plotting an integer array using: matplotlib.pyplot.plot().
> For my purposes it is imperative that the x-axis be explicitly defined.
> I have tried to achieve this by using: matplotlib.pyplot.axis(v).
> Where v is a list of integer values corresponding to the desired axes
> limits [xmin, xmax, ymin, ymax].
> However, the x-axis that is displayed does not obey my explicit xmax
> declaration; the value is rounded up.
>
> Here is the relevant portion of my code:
It is always better to provide a minimal but complete self-contained
example illustrating the problem.
>
> fig = pyplot.figure(figsize=(16,8))
> ax1 = fig.add_axes([0.05, 0.15, 0.9, 0.8])
> v = [0, len(myintvector), 0, max(myintvector, key=int)]
> ax1.axis(v)
> ax1.plot(myintvector, 'r--')
I am not seeing the problem when I try what I think is a minimal
example; what version of mpl are you using? And have you tried calling
axis after the call to plot? This might have been necessary in some
earlier versions; I don't recall.
(In ipython -pylab, my example was this:
ax1 = gca()
ax1.axis([0,9.9,0,9.9])
ax1.plot([1,2])
draw()
in which no rounding occurs.)
Eric
>
> The reason that I need the x-axis to match the length of my integer
> vector is because I am also drawing a colorbar immediately below the
> plot, the values of which describe the same integer vector. Therefore I
> need the colorbar coordinates to match the x-axis coordinates of my plot.
>
> I hope that I have described my issue coherently. Please be kind (N00b
> alert).
> Any help is greatly appreciated!
>
> Sincerely,
> Lionel 'Lee' Brooks 3rd
> Dartmouth Genetics Grad Student
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