python imshow、pcolor、contourf的区别

def gaussian(u, v,cenu, cenv, wid):
    return (1/(2*numpy.pi*wid**2)) *numpy.exp(-(u-cenu)**2 / (2*wid**2)-(v-cenv)**2 / (2*wid**2))

data =numpy.empty((25,3))
x =numpy.arange(-2,3,1)
y =numpy.arange(-2,3,1)
xx, yy =numpy.meshgrid(x, y)
zz =gaussian(xx,yy,0,0,0.5)

plt.pcolor(xx, yy,zz)
plt.imshow(zz)
plt.contourf(xx, yy,zz)
plt.pcolor(numpy.r_[x,3], numpy.r_[y,3], zz)

pcolor最接近真实值，别的两个都有插值。但是pcolor有个问题，指定X和Y时维度要比数据点C高一维，否则C的最后一维将被忽略。更正的图见最后。