Streamlines spacing in streamslice function

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Camille Grimaldi 2021-8-22

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评论： Joel Fischer 2022-6-13

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Hi,

Just curious about what determines the spacing between the streamlines when using the streamslices function. It says it draws "well spaced streamlines", but not sure what that means.

When I use the matlab example:

        load wind
         vel=sqrt(u(:,:,1).^2+v(:,:,1).^2)
         pcolor(x(:,:,1),y(:,:,1),vel);shading flat;hold on
         streamslice(x(:,:,1),y(:,:,1),u(:,:,1),v(:,:,1))

It does not look like the streamlines are closer together when the velocities are higher, which makes me wonder why does the spacing changes.

Would appreciate if anyone has an anwser!

Cheers,

Camille

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darova 2021-8-25

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Looks like you created your own Z coordinate. But velocity field is standard.

[x,y,z] = peaks(30);

[u,v] = gradient(z);

ind = true(30);

ind(3:end-2,3:end-2) = false;

pcolor(x,y,z)

shading flat

streamline(x,y,u,v,x(ind),y(ind))

Joel Fischer 2022-6-13

Looking at the source code (R2021a) it appears the density of streamlines is not proportional to the magnitude of the vector field. Instead the algorithm tracks the local density on a grid to avoid placing new streamlines that whould come to close to already existing ones.

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