I usually use the following to make single arrows:
plot([0,1], 'k.')
arr1 = pylab.Arrow(0.5, 0.5, 0.1, 0.0, width=0.02)
fig = pylab.gca()
fig.add_patch(arr1)
If in "ipython -pylab" you need to savefig or send another command
(e.g. xlabel) or reload/refresh the plot (I can't remember the
command) for the new patch to display. I use this rather than arrow()
because I can control the arrow width and other properties. There is
also the quiver command which lets you draw many arrows:
quiver([[0, 1, 2]], [[0, 1, 2]], [[0.0, 0.0, 0.0]], [[0.1, 0.1,
0.1]], 0.2)
Cheers,
Jessica
On Jul 20, 2007, at 6:32 AM, Alexander Dietz wrote:
Hi,
How is the syntax for the matplotlib command 'arrow'? There is not
very much to take from the help (see below). An example would be nice.
Thanks
Alex
In [46]: arrow?
Type: function
Base Class: <type 'function'>
String Form: <function arrow at 0xb77f8a3c>
Namespace: Interactive
File: /usr/lib/python2.4/site-packages/matplotlib/pylab.py
Definition: arrow(*args, **kwargs)
Docstring:
Draws arrow on specified axis from (x,y) to (x+dx,y+dy).
Optional kwargs control the arrow properties:
alpha: float
animated: [True | False]
antialiased or aa: [True | False]
axes: an axes instance
clip_box: a matplotlib.transform.Bbox instance
clip_on: [True | False]
clip_path: an agg.path_storage instance
edgecolor or ec: any matplotlib color
facecolor or fc: any matplotlib color
figure: a matplotlib.figure.Figure instance
fill: [True | False]
hatch: unknown
label: any string
linewidth or lw: float
lod: [True | False]
picker: [None|float|boolean|callable]
transform: a matplotlib.transform transformation instance
visible: [True | False]
zorder: any number
Addition kwargs: hold = [True|False] overrides default hold state
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