python - Why does pyplot.quiver plots vectors with infinite length? -

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i plotting 5x10 matrix of vectors using pyplot.quiver :

from pylab import *  column_resolution = 10 row_resolution = 5  plotborders = 2 x,y = meshgrid(arange(column_resolution),arange(row_resolution)) # x,y positions of vectors u = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0,          0, 0, 0, -1.0, 0, 0, 0, 0, 0, 0,          0, 0, 0, 0, 0, 0, 0, 0, 0,0,          0, 0, 0, 0, 0, 0, 0, 0, 0, 0,          1.0, 0, 0, 0, 0, 0, 0, 0, 0, 0]  v = [0, 0, 0, 0, -1.0, 0, 0, 0, 0, 0,          0, 0, 0, 0, 0, 0, 0, 0, 0, 0,          0, 0, 0, 0, 0, 0, 0, 0, 0, 0,          0, 1.0, 0, 0, 0, 0, 0, 0, 0, 0,          0, 0, 0, 0, 0, 0, 0, 0, 0, 0]  lim = 10 xlim(-1*lim,lim) ylim(-1*lim,lim) quiver(x,y, u, v) show()

the resulting figure has vectors infinite length - no matter how extend axes (the parameter lim) arrows' head not seen :

lim = 10 enter image description here

lim = 100 enter image description here

what doing wrong?

thanks!

use "scale" parameter in quiver command:

quiver(x,y, u, v, scale=20.0)

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