How to plot location and magnitude

Hi All

I currently have three vectors two of which contain x and y coordinates, and the last one containing stress magnitudes. How can I go about creating a smooth coloured plot which contains the stress magnitude at its x and y location? I have tried the surf(x,y,z) and also tried surf(x,y,z,C) where z is just a zero vector the same length as z and y, but still it does not work. Any help would be much appreciated

[José-Luis]

Could you show an example of what you are trying to achieve and what you get at the moment?

[Adikar]

As an example, say I'll have the following vectors:

x=[0 0 0 1 1 1]'
y=[0 1 2 0 1 2]'

these basically make up locations on a rectangular grid. I then have the vector, say:

C=[15 10 0 20 10 0]'

For which each value is located at the x-y coordinate pair. So C(i) is located at x(i),y(i). I've tried using surf (x,y,C) but matlab returns basically that C needs to be a matrix. I essentially want a 2-D plot that looks like a stress distribution but don't have a clue how to move forward.

Answer 1

[Walter Roberson]

TriScatteredInterp class, or its new replacement scatteredinterpolantclass . You would interpolate over a grid.