Catherine Thwaites, on 2011-03-23 10:10, wrote: > I have tried to search for the answer but have not found anything useful so > forgive me if this has been answered before. > I want to change the linestyle of a regular plot to an arrow, in the > direction of the data in the tuple. So in this script below I would like an > arrow head pointing to the next marker. > There does not seem to be a line style to do it, but is there a way I can > add the head at the correct end of the line?
Hi Catherine,
here's one way to get the type of plot you desire, and you might
also consider using a series of annotation with arrows to get a
similar effect:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib as mpl
labels=('91','92','93','94','95')
data1 = np.array([2500, 3000, 3500, 3000, 2700])
data2 = np.array([200, 250, 270, 320, 250])
fig = plt.figure()
ax = fig.add_subplot(111)
# the next line is only use to set the proper lims,
p = ax.plot(data1, data2, 'bo', linestyle='-', markersize=3, alpha=0)
for x,y,dx,dy in zip(data1[:-1],data2[:-1], np.diff(data1), np.diff(data2)):
ax.arrow(x,y,dx,dy, head_width=10, length_includes_head=True)
ax.set_ylim(0, 350)
for i, label in enumerate(labels):
x_loc = data1[i]
y_loc = data2[i]
txt = ax.annotate(label, xy=(x_loc, y_loc), size=8,
xytext=(-10, 10), textcoords='offset points',
arrowprops=None)
plt.axis('equal')
plt.show()
best,
--
Paul Ivanov
314 address only used for lists, off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7
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