Hi! Bumping this upstream from Sage, where we use quiver to draw slope fields. The following code
### import matplotlib.pyplot as plt import numpy as np fig = plt.figure() r = np.arange(10) X,Y = np.meshgrid(r,r) U, V = np.cos(X), np.sin(Y) Q = plt.quiver( U, V, headlength=0, headaxislength=0) ### produces exactly what we want, but generates some warnings: /usr/local/lib/python2.7/dist-packages/matplotlib/quiver.py:622: RuntimeWarning: divide by zero encountered in divide shrink = length/minsh /usr/local/lib/python2.7/dist-packages/matplotlib/quiver.py:623: RuntimeWarning: invalid value encountered in multiply X0 = shrink * X0[np.newaxis,:] /usr/local/lib/python2.7/dist-packages/matplotlib/quiver.py:624: RuntimeWarning: invalid value encountered in multiply Y0 = shrink * Y0[np.newaxis,:] We can get around this by using some tiny headlength (minsh = self.minshaft * self.headlength) but it seems more natural to avoid drawing one entirely. Would there be any objections to a pull request which special-cased 0 to avoid this? Doug ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
