设置用于使用matplotlib contourf绘制的数组蒙版值的颜色

Question

When I plot an array with masked values, using matplotlib countourf , the masked values appear white. I want them to appear grey.

I tried the set_bad method, but it seems countourf doesn't recognize it (although it recognizes the set_over and set_under methods).

Is there any other method I can use with contourf ?

Or will I have to change my code to use imshow , which understands set_bad , instead of countourf ?

Answer 1

Have you tried setting first the background, like:

x,y=meshgrid(linspace(0,1),linspace(0,1))
fig=plt.figure()
a=fig.add_subplot(111,axisbg='gray')
z=ma.masked_array(x**2-y**2,mask=y>-x+1)
a.contourf(z)