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+--- Thread: Quiver fonction (/thread-16924.html)
Quiver fonction - Blaue_Blume04 - Mar-20-2019
Hello,
I currently am trying to display on python a gradient using the fonction “quiver”.
Unfortunately I cannot manage to find a way to have the arrow the size I want: I would like to have all the arrow the same size.
All attempts were unsuccessful hitherto.
Thank you for your time.
RE: Quiver fonction - Larz60+ - Mar-20-2019
Please show your code, or read: https://matplotlib.org/api/_as_gen/matplotlib.pyplot.quiver.html
RE: Quiver fonction - scidam - Mar-21-2019
Quiver function does scaling arrows length when plotting them. To get arrows of the same (and desirable)
length, you need to prevent this behavior by passing
scale=1 as a keyword argument. Look at the following code snippet I just wrote:
import numpy as np import matplotlib.pyplot as plt X, Y = np.meshgrid(np.arange(3), np.arange(3)) # 3x3 matrix of arrow beginnings arrow_length = 0.3 # all arrows will have the same length arrow_direction = np.pi / 4 # all arrows will have the same direction U = arrow_length * np.ones(X.shape) * np.cos(arrow_direction) V = arrow_length * np.ones(X.shape) * np.sin(arrow_direction) plt.quiver(X, Y, U, V, scale=1) # all arrows should have the same length = 0.3 and inclined to x-axes on 45 deg. plt.show()