How can i draw contours of a function of the form f(x)=X1^2+X2^2?

contour(X1,X2,f) doesn't draw contours.

Answer 1

[Honglei Chen]

Are you looking for something like this?

ezcontour(@(x1,x2)x1.^2+x2.^2)

HTH

[Peter Mose]

yes,something like that. can it plot contours/

[Honglei Chen]

What I showed is a contour plot. Could you explain what you want?