On 03/11/2012 12:27 PM, D. S. McNeil wrote: > 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?
No objections at all; it sounds like a good idea. Eric > > > 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 ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
