2D vector plot in MATLAB.

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subho
subho 2011-2-27
I have x, y, u and v datas. I am trying to do vector plot using quiver command in MATLAB. The plot is coming OK, but as there are many vectors the figure looks a bit clumsy. So Iwant to skip some vectors. Is it possible to do so using quiver in MATLAB or I have to use some other software? Kindly help. Say I want to skip 6 vectors. The vector plot as generated by Mr Oleg could have been generated just by potting in between x axis limits from -2.5 to 0. It may also be helpful if I can select with a mouse where to plot the vectors.
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Jan
Jan 2011-2-27
It would be helpful, if you explain the criteria to exclude vectors. Every second one or do you want to select them with the mouse?

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回答（1 个）

Oleg Komarov
Oleg Komarov 2011-2-27

Taking the example from quiver:

[X,Y] = meshgrid(-2:.2:2);
Z = X.*exp(-X.^2 - Y.^2);
[DX,DY] = gradient(Z,.2,.2);

% Plot
subplot(2,1,1)
quiver(X,Y,DX,DY)
set(gca,'Xlim', [-2.5 2.5], 'Ylim',[-2.5 2.5])
% Index just some vectors
idx = 1:10;
subplot(2,1,2)
quiver(X(:,idx),Y(:,idx),DX(:,idx),DY(:,idx))
set(gca,'Xlim', [-2.5 2.5], 'Ylim',[-2.5 2.5])

Oleg

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