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reported viaVisTrails/VisTrails#1132
may be a regression from 1.3 series, reported against 1.4.3, verified against master. Not sure what last version it work on was.
importmatplotlib.pyplotaspltimportnumpyasnpdeffunc3(x, ):return (1-x/2+x**5+y**3)*np.exp(-x**2-y**2)# make these smaller to increase the resolutiondx,dy=0.05,0.05x=np.arange(-3.0,3.0001,dx)y=np.arange(-3.0,3.0001,dy)X,Y=np.meshgrid(x,y)Z=func3(X,Y)# failsplt.pcolor(X,Y,list(Z))# plt.pcolor(X, Y, Z) # works