具有恒定箭头大小的Matplotlib颤动图 [英] Matplotlib quiver plotting with constant arrow size

问题描述

我正在尝试绘制一个简单的颤动图(例如在matplotlib画廊中: http ://matplotlib.org/examples/pylab_examples/quiver_demo.html )，尽管我不希望启用自动缩放功能.

I'm trying to plot a simple quiver plot (e.g. as in the matplotlib gallery: http://matplotlib.org/examples/pylab_examples/quiver_demo.html), although I don't want the autoscaling feature enabled.

我只想显示场方向，而不是幅度.

I only want to show the field direction, not the magnitude.

有没有一种方法可以将箭头大小设置为常数?我尝试使用比例尺和比例尺单位，但这似乎只是将所有箭头更改了一些共同的因素.

Is there a way to set the arrow size as constant please? I tried playing with the scale and scale units but this just seems to change all arrows by some common factor.

谢谢

推荐答案

更改刻度对此无效.您需要对向量进行归一化，例如

Changing scale won't work for this. You need to normalize the vectors, e.g.

X, Y = np.meshgrid(np.arange(0, 2 * np.pi, .2), np.arange(0, 2 * np.pi, .2))
U = np.cos(X)
V = np.sin(Y)

# Normalize the arrows:
U = U / np.sqrt(U**2 + V**2);
V = V / np.sqrt(U**2 + V**2);


plt.figure()
plt.title('Normalized arrows')
Q = plt.quiver(X, Y, U, V, units='width')
qk = plt.quiverkey(Q, 0.9, 0.9, 2, r'$2 \frac{m}{s}$', labelpos='E',
                   coordinates='figure')

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