MATLAB: Contour plot of 3 vectors

contour meshgrid plotting

Hi Everyone, I have 3 vectors each is 1×38 and I'm trying to cotour them on a 2D contour so that I have the values of the first vector on the x axis, the second vector on the y axis, and the third vector as lines on the chart itself with a value written on each line. I would be really grateful if you could help. Thanks

Best Answer

Probably the easiest option is to use the griddata (link) function.

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MATLAB: Creating a 3D surface plot from a matrix

That would only be possible if your data are gridded (so the x and y data are in regular patterns).

Probably the easiest way to determine that is to plot it with stem3. If the (x,y) data appear to regularly-spaced so the z data approximates a surface, use the reshape function on each of the vectors to form the required matrices.

If your data are scattered, use the griddata (link) function or one of its friends (linked to at the end of that page) to create your requisite gridded data to use with surf.

MATLAB: Having trouble to contour plot the results of a matrix.

I am not certain what the problem is.

Try this:

x = M(1,:);
y = M(2,:);
z = M(3,:);
N = 100;                                            % Choose The Appropriate Value
xv = linspace(min(x), max(x), N);                   % ‘x’ Vector
yv = linspace(min(y), max(y), N);                   % ‘y’ Vector
[Xm,Ym] = ndgrid(xv, yv);                           % Can Also Use ‘meshgrid’ With Different Results
Zm = griddata(x, y, z, Xm, Ym);                     % Interpolate To Produce ‘Z’ MAtrix
figure
contour(Xm, Ym, Zm)                                % Works With Ycontour’, ‘surf’, ‘mesh’ And Similar Fucntions

It would help to have your data to test this, however this approach usually works.

Best Answer

Related Solutions

MATLAB: Creating a 3D surface plot from a matrix

MATLAB: Having trouble to contour plot the results of a matrix.

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