[Matplotlib-users] Arranging subplots on a square regular grid

Jody Klymak jklymak at uvic.ca
Wed Oct 31 11:38:31 EDT 2018

Hi Daniele,

This is also explicitly the use-case that `axes_grid1` toolkit is meant for.   I’m trying to move as much axes_grid1 stuff out of the toolkit into the main code as possible, but what you want is orthogonal to how layout managers that are currently in matplotlib work, so axes_grid1 is still useful here. 

https://matplotlib.org/gallery/axes_grid1/simple_axesgrid.html <https://matplotlib.org/gallery/axes_grid1/simple_axesgrid.html>

Cheers,  Jody

> On 31 Oct 2018, at 08:30, Joe Kington <joferkington at gmail.com> wrote:
> If you're okay with a fixed figure size, you can use plt.figaspect to set this up fairly easily: (i.e. this will be incorrect as soon as you resize the plot window)
> import numpy as np
> import matplotlib.pyplot as plt
> nrows, ncols = 8, 12
> dx, dy = 1, 2
> figsize = plt.figaspect(float(dy * nrows) / float(dx * ncols))
> fig, axes = plt.subplots(nrows, ncols, figsize=figsize)
> for ax in axes.flat:
>     data = np.random.random((10*dy, 10*dx))
>     ax.imshow(data, interpolation='none', cmap='gray')
>     ax.set(xticks=[], yticks=[])
> pad = 0.05 # Padding around the edge of the figure
> xpad, ypad = dx * pad, dy * pad
> fig.subplots_adjust(left=xpad, right=1-xpad, top=1-ypad, bottom=ypad)
> plt.show()
> (From here, for reference: https://stackoverflow.com/questions/32633322/changing-aspect-ratio-of-subplots-in-matplotlib/32635933#32635933 <https://stackoverflow.com/questions/32633322/changing-aspect-ratio-of-subplots-in-matplotlib/32635933#32635933> )
> If you need the spacing to remain constant as the figure size changes, it's possible, but more complex.  You may find it's easiest to use draw callbacks in that case.
> Hope that helps,
> -Joe
> On Tue, Oct 30, 2018 at 4:44 PM Daniele Nicolodi <daniele at grinta.net <mailto:daniele at grinta.net>> wrote:
> Hello,
> I would like to arrange a number of square subplots (as in subplots with
> square axes as obtained with `ax.axis('equal')`) in a grid such that the
> distance between rows and columns is exactly the same.
> I can use a GridSpec but, as soon as I ask for the axes to be square,
> the distance between axes changes. Is there a way to enforce the equal
> distances constrain (namely stretch the padding between the axes and the
> margin of the figure but do not stretch the padding between axes) or the
> only solution is to do it manually?
> Thank you in advance.
> Best,
> Dan
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Jody Klymak    

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