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
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
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
The automatic docstring generation for this command is badly fouled up, and I can't straighten it out right now. In the meantime, look at the docstring for FancyArrow.__init__ in patches.py. There is also a horrendously complicated example in examples/arrow_demo.py.
Depending on what you want to do, you might find the annotate command to be what you want. I think its docstring is in better shape, as its example: examples/annotate_demo.py.
Eric
Jessica Lu wrote:
···
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
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net <mailto:Matplotlib-users@lists.sourceforge.net>
matplotlib-users List Signup and Options
------------------------------------------------------------------------
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
------------------------------------------------------------------------
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
matplotlib-users List Signup and Options