How to create a contour plot from 3 vectors

Hello,

I have a table with 3 columns X,Y,Z.

how do I create a contour ploy for Z(x,y)?

Thank you

Answer 1

[Walter Roberson]

numcontours = 5;

[minx, maxx] = bounds(X);
[miny, maxy] = bounds(Y);
xv = linspace(minx, maxx);
yv = linspace(miny, maxy);
[XGrid, YGrid] = meshgrid(xv, yv);

F = scatteredInterpolant(X, Y, Z);
ZGrid = F(XGrid, YGrid);

contour(XGrid, YGrid, ZGrid, numcontours);

[Robert Jones]

Thank you

Answer 2

[Walter Roberson]

numcontours = 5;
%https://www.mathworks.com/matlabcentral/fileexchange/38858-contour-plot-for-scattered-data
TRI = delaunay(X, Y, Z);
tricontour(TRI, X, Y, Z, numcontours);