Quiver Plot from matrices
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I have a problem making a arrow-like plot from 2 matrices.
Suppose I have 2 matrices, each filled with zeros, except for at certain positions. like the below:
xComponent = zeros(5,5)
xComponent(3,3) = 1
yComponent = zeros(5,5)
yComponent(3,3) = 2
I now have 2 matrices, one containing the x-component of the "arrow" that I want plotted, and the other containing the y-component. What I was for is to make a "plot" of the 5x5 grid, with an arrow, originating in the point (3,3), with an x-component of 1 and y-component of 2.
The below is a crude image, portraying what I am trying to accomplish.
I have much larger matrices with much more values, but I feel confident that I can make it work on a large scale, if I can just make it work with this.
I do NOT want to explicitly give quiver() the values it needs, I want to somehow generalize it, so that quiver(), or a function like it, can grab the values directly from the matrices and make an arrow-plot.
Thanks!
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Cris LaPierre
2019-4-4
编辑：Cris LaPierre
2019-4-4
What do you mean by not wanting to give quiver the values it needs? Not sure how you would create the plot without doing that. Here's how I would recreate your plot.
xComponent = zeros(5,5);
xComponent(3,3) = 1;
yComponent = zeros(5,5);
yComponent(3,3) = 2;
[Y,X]=meshgrid(1:size(xComponent,1),1:size(xComponent,2));
figure
plot(X,Y,'k.','MarkerSize',10)
hold on
quiver(X,Y,yComponent,-xComponent,2)
1 个评论
Franciszek Aniol
2022-4-27
I think the person meant that instead of writing this:
quiver(X,Y,yComponent,-xComponent,2)
the option would be
M = [X,Y,yComponent,-xComponent,2]
quiver(M)
It's just an assumption that this was meant under "not wanting to give quiver the values it needs".
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