hi all, i am trying to plot a series of arrows between points on a scatter plot, using the following code:
import matplotlib.pyplot as plt from matplotlib.patches import FancyArrowPatch from numpy import * from scipy import * def plot_arrows(init_val, all_vals, c='k'): plt.figure() ax = plt.gca() prev_val = init_val for x, y in all_vals[1:]: ax = plt.gca() start_coord = prev_val plt.scatter(start_coord[0], start_coord[1], c=c) end_coord = (x, y) ax.add_patch(FancyArrowPatch(start_coord, end_coord, arrowstyle='->', edgecolor=c, facecolor=c, mutation_scale=10)) prev_val = end_coord plt.scatter(all_vals[-1][0], all_vals[-1][1], c=c) points = rand(5,2) init = [0, 0] plot_arrows(init, points) plt.show() this usually works, but sometimes when i give it a set of points (not necessarily ones generated randomly), then it gives me the error: Library/Python/2.5/site-packages/matplotlib/bezier.pyc in split_path_inout(path, inside, tolerence, reorder_inout) 265 266 if bezier_path is None: --> 267 raise ValueError("The path does not seem to intersect with the patch") 268 269 bp = zip(bezier_path[::2], bezier_path[1::2]) ValueError: The path does not seem to intersect with the patch any idea what could be causing this? it seems like any arbitrary set of points should work here, since you can always draw an arrow between any two points.... not sure what is the root of this error. any help would be really appreciated. thank you. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users