Contour plotting with x,y,z data

Hello, I am in need of plotting contour of the data I have. I have values for x,y,z axis. Now I am not having any relation between these axes.

How can I plot contour of it? I checked Matlab help and everywhere they have mentioned a relation z axis with x and Y which I don't have!

[Thomas Koelen]

I'm not sure what you mean, if there is no relation between the axes why would you want to plot them?

Can you show us some of your data?

Thomas

[adi kul]

There is relation from which they have created this data but that relation is not known to me. All I got an excel sheet with 1st row as "Y" axis, 1st column as "X" axis and all the in between rows and columns as Z axis points. And my task is to make a contour of these values!

[Walter Roberson]

Do you mean that you have scattered input? Vectors of X, Y, and Z rather than rectangular grids?

[adi kul]

Found something similar I am looking for. And the best answer was given for matplotlib python script here: http://stackoverflow.com/questions/15881959/3d-plotting-from-x-y-z-data-excel-or-other-tools

Can I adapt it to Matlab? If yes then how?

Answer 1

[Walter Roberson]

See a File Exchange submission for contour plots of scattered data over here

[adi kul]

not useful! uniplot does this job but why can't Matlab??

[Bjorn Gustavsson]

Yes useful. Download function in link, then try this example:

x = randn(312,1); 
y = randn(312,1); 
tri = delaunay(x,y);
z = exp(-x.^2/0.5^2-abs(y.^3)/0.3^3);
[c,h] = tricontour(tri,x,y,z,7);

That is how matlab can do this job.

If your data are significantly different, for example way fewer points or some special geometry that makes other solutions better, we cant tell without more information.

HTH