How to limit the contour plot to specific points?

How could I plot contour until the toppest scatter points?

Answer 1

[Star Strider]

See the documentation on Contours at One Level (link) in the contour (link) documentation.

[Philippe Corner]

Im not trying to plot only that line, im trying to plot the contour below that line only.. (below the black line in attached image)

[Star Strider]

You can set the contour levels you want as the third argument to contour or contourf:

[X,Y,Z] = peaks;
contourf(X,Y,Z, [0 : 7])

This creates and draws the contours from 0 to 7 for that function. Those less than or equal to 0 are white, those greater than equal to 7 are all colored with the color for 7.

[Philippe Corner]

Not sure why is not working. I had to create my contour using a matrix

[c,h]=contourf(xq,yq,reshape(zq,100,100));

[Star Strider]

I cannot determine the reason it is not working without your data and code. The first two arguments can be vectors or matrices, the third must be a matrix. The dimensions must match in any event.

Apparently your reshape call solved the problem.