Eric Firing wrote: > jason-s...@creativetrax.com wrote: >> A couple of us are trying to figure out how to scale arrows in a >> quiver plot so that we can exactly specify what the output arrows >> look like. For example, we'd like to scale the vectors to half of >> their size, and have it look like that on the quiver plot. >> >> So I tried even just getting a quiver plot to plot an arrow exactly >> as I passed it, without it scaling anything. My attempt is this: >> >> import matplotlib.pylab as plt >> fig=plt.figure(figsize=[6,6]) >> q=plt.quiver([0],[0],[1],[1],units='x',scale=1,angles='xy') > > I have committed a change to svn trunk, so that if you change the > above to > > q = plt.quiver([0],[0], [1], [1], scale_units='xy', angles='xy', scale=1) > > it should do exactly what you want. When scale_units is given, the > setting of "units" controls only the specification of the arrow width, > so if you are not specifying the width, it doesn't have any effect. > > If I could start from scratch, I probably could come up with a better > set of kwarg names and defaults; but for reasons of > backwards-compatibility, this is what we have. The new scale_units > kwarg makes it much easier to manually set the scale. Previously (and > still with the default of scale_units=None), it was almost hopelessly > confusing. > > (Maybe I should add "width_units", identical to "units", and deprecate > the latter; this might make the meanings of the kwargs clearer.) >
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