在 python (matplotlib) 中绘制矢量场
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Plotting vector fields in python (matplotlib)
提问by devoured elysium
I found this code on http://matplotlib.sourceforge.net/examples/pylab_examples/quiver_demo.html
我在http://matplotlib.sourceforge.net/examples/pylab_examples/quiver_demo.html上找到了这段代码
from pylab import *
from numpy import ma
X,Y = meshgrid( arange(0,2*pi,.2),arange(0,2*pi,.2) )
U = cos(X)
V = sin(Y)
#1
figure()
Q = quiver( U, V)
qk = quiverkey(Q, 0.5, 0.92, 2, r' \frac{m}{s}$', labelpos='W',
fontproperties={'weight': 'bold'})
l,r,b,t = axis()
dx, dy = r-l, t-b
axis([l-0.05*dx, r+0.05*dx, b-0.05*dy, t+0.05*dy])
title('Minimal arguments, no kwargs')
Now, how can I see this graphic? Better yet, how can I save it to a file as, let's, say, JPEG? The code seems to run but I can't see anything happening.
现在，我怎样才能看到这个图形？更好的是，我怎样才能将它保存到一个文件中，比如说，JPEG？代码似乎在运行，但我看不到任何事情发生。
采纳答案by unutbu
Stick show()at the end of the script. Or to save it to a jpg file, put
坚持show()在脚本的末尾。或者将其保存为 jpg 文件，输入
savefig('output.jpg')
show()
Be sure to put the savefig()command before the show().
确保将savefig()命令放在show().
回答by doffles
Ideally, you would type this in an interactive shell ( like EPD Python's PyLab ) . Otherwise, you need to explicitly invoke the show()command
理想情况下，您可以在交互式 shell（如 EPD Python 的 PyLab）中键入它。否则，您需要显式调用show()命令
