Plotting a vector in matplotlib

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1

Isn’t that what quiver does? Or am I misunderstanding the question?

2010/5/3 aditya bhargava <bluemangroupie@…287…>

···

Thanks Johan and Matthias,
I was just wondering if there was a built-in way to do this in matplotlib. It seems like it would be a useful method to have.

Adit

2010/5/3 Johan Grönqvist <johan.gronqvist@…287…>

2010-05-02 20:19, aditya bhargava skrev:

Is there a straightforward way of plotting a vector in matplotlib?

Suppose I want to plot the vector [1 2]'. If I pass this vector in to

plot(), I get the line that passes through (0,1), (1,2). Instead I want

the line that passes through (0,0),(1,2).

I use pyplot.Arrow to visualize displacement fields.

This is a snippet copied from the code I use (it sits in a loop over all

vectors I want to plot):

     arr = plt.Arrow(x, y, dx, dy)

     plt.gca().add_patch(arr)

In your case, you would have (x, y) = (0, 0) and (dx, dy) = (1, 2).

Regards

Johan

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2

I don’t think that plots a vector. Here’s the sort of thing I was looking for:

http://www.mathworks.com/matlabcentral/fx_files/23608/1/content/html/drawLAInro_02.png

Of course it doesn’t need to be a point…it can be a line or a line segment too.

Adit

···

On Mon, May 3, 2010 at 9:13 PM, Joe Kington <jkington@…150…> wrote:

Isn’t that what quiver does? Or am I misunderstanding the question?

2010/5/3 aditya bhargava <bluemangroupie@…287…>

Thanks Johan and Matthias,
I was just wondering if there was a built-in way to do this in matplotlib. It seems like it would be a useful method to have.

Adit

2010/5/3 Johan Grönqvist <johan.gronqvist@…287…>

2010-05-02 20:19, aditya bhargava skrev:

Is there a straightforward way of plotting a vector in matplotlib?

Suppose I want to plot the vector [1 2]'. If I pass this vector in to

plot(), I get the line that passes through (0,1), (1,2). Instead I want

the line that passes through (0,0),(1,2).

I use pyplot.Arrow to visualize displacement fields.

This is a snippet copied from the code I use (it sits in a loop over all

vectors I want to plot):

     arr = plt.Arrow(x, y, dx, dy)

     plt.gca().add_patch(arr)

In your case, you would have (x, y) = (0, 0) and (dx, dy) = (1, 2).

Regards

Johan

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2010-05-04 04:13, Joe Kington skrev:

Isn't that what quiver
<http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.quiver&gt;
does? Or am I misunderstanding the question?

Regardless of the OPs question, the quiver seems to be the solution I should use for my purpose.

Thanks.

/ Johan