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I have data on the form (x, y, z, v), in other words three spatial coordinates and one velocity magnitude. I would like to plot this in 3D, where the velocity magnitude is shown using color.

What is the best way to do this in MATLAB?

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I assume you have trajectory data, so that your spatial coordinates represent the trajectory through space of one or more particles. In that case:

Have a look at quiver3 or coneplot.

If you want colored arrows, then have a look at quiver3d or quiverc (2D only) on the File Exchange.

If you only have 3 spatial coordinates and speed (= velocity magnitude), then your best bet is scatter3.

I could go on, but could you give me a bit more detail on what you want exactly?

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Thanks, much appreciated. I have three spatial coordinates, x, y, z and three velocity components vx, vy, vz. It describes the flow around a car, so my data is taken from the surface of the car -- and I basically want the direction and magnitude of the velocity shown. coneplot actually looks promising for this, what do you say?
@BillyJean: Yes, that one is made for this :)
Great, thanks for pointing me in that direction. In the example they use matrices, and not vectors though? Do you have a MWE? Thanks so far, really pushed me forward.
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Have you tried surf(x,y,z,v)?

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This is only useful if the data forms a surface rather than a volume. If there are multiple z values for each x-y pair, then you can't use this approach.

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