How to create a vectorfield?

Hi everyone,

I would like to create a cube with vectors as elements, let's say a vector field of unit vectors e.i. length one. Is this possible and how is it done? Thanks for your input.

Best, Peter

Answer 1

[Sean de Wolski]

doc meshgrid
doc quiver3
doc coneplot

Not sure of the details of what you want but it's likely some combination of the above.

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Yes, you would use meshgrid for this:

The meshgrid would generate the coordinate matrices or rather the base of your vectors. Then you would need three more matrices of equal size that would be the components.

Here is an example that draws one unit vector at (0,0,0) pointing up and to the right with unit length:

s = fzero(@(s)1-sqrt((s^2)*3),1);
quiver3(0,0,0,s,s,s)

Now if you wanted it for the full thing, you could use s, repmat-ed to be the size of the output from meshgrid, etc.

Answer 2

[Peter]

Hi Sean,

I'm pretty sure this will become handy at some point but right now I'm not so worried about plotting a vector field but creating one. Or is meshgrid really what I'm looking for?

I'd like to have a let's say 10x10x10 matrix and fill each cell with vectors pointing upwards, length one.

[Sean de Wolski]

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