Magnitude and direction of vectors

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Ede gerlderlands
Ede gerlderlands 2013-6-30
I have really find it difficult to plot both flow and direction of flow vectors superimposed each other. I have plotted the direction of the flow vector using
quiver(n,s,x,y) .
But the magnitude is given by
mag= sqrt(x.^2+y.^2);
Is there a way to plot magnitude of vector with direction
Thanks in advance.

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回答（1 个）

the cyclist
the cyclist 2013-6-30
编辑：the cyclist 2013-6-30
Really, I think you can solve your problem by reading the documentation for quiver() more carefully.
doc quiver
The first two arguments specify the spot where each vector will begin. The next two specify the length of each component.
x_start = 1;
y_start = 2;
x_length = 7;
y_length = 3;
figure
scale=0;
quiver(x_start,y_start,x_length,y_length,scale); % Set scale==0, to prevent auto-scaling. See documentation.
For your real plot, x_start etc are going to be column vectors with your actual data.

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