X is a vector of random numbers 100×1. It is then multiplied by 16 and 8 is subtracted from it.

xlin is a vector of lineraly spaced numbers (33 in total) that range from the minimum to the maximum of x.

x=rand(100,1)*16-8;
y=rand(100,1)*16-8;
xlin=linspace(min(x),max(x),33);

i try to run randomly, but appear error with “cubic” like
The input character is not valid in MATLAB statements or expressions.

Thanks

I think this will work:

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/delaunaytriclass.html

Doug

I think you would be well served to look at the series about volume visualization. It starts here:

http://blogs.mathworks.com/videos/2009/10/23/basics-volume-visualization-19-defining-scalar-and-vector-fields/

The one about isosurfaces will be posted today or tomorrow (11/10/2009). That is very likely the function you seek.

Doug

Thanks for these videos, they have really helped me alot. I am currently looking to create a surface plot (non uniform data) but I would like to represent it in the z-axis. To explain myself better:

If you think of various layers of semi circles made up of dots, and as you move ‘up’, the number of dots are increasing, so it ends up looking like a funnel. Now the code you presented here creates a surface for each circle (ie. for each layer), but now I want to create a surface joining the layers. I hope I have explained myself adequately. Thanks again and I would really appreciate your input.

Kind Regards

I am not sure that I understand the question. If you have x,y,z triples, you just plot them. Are you trying to fit a polynomial to them? That would imply a two dimensional dataset. Are you trying to fit some kind of a surface to the data?

You might be best off looking here:

http://blogs.mathworks.com/pick/how-to-get-help/

It shows how to ask for help at the bottom.

Doug