title: matplotlib: Set width or height of figure without changing aspect ratio
body: <p>I'd like to choose the width of a figure, while still letting matplotlib choose the aspect ratio that it finds suitable.  Every method I know to change the figure size requires a (width, height) tuple, which forces a certain aspect ratio.  Is there any way to specify just the width (or just the height) and allow matplotlib to choose a suitable aspect ratio?</p>