Nassim Khaled

Hi Jan. Thanks for the constructive comment.You are right(in all of what you said). This function is very similar to plotyy, yet people are always asking about this, and for some reason, it is easier to find these files on Matlab central than Matlab help.

There should be something built-in/matlab to manipulate equations and text. Thanks

Determine the intersection of these two planes:
% 2x - 5y + 3z = 12 and 3x + 4y - 3z = 6
% The first plane is represented by the normal vector N1=[2 -5 3]
% and any arbitrary point that lies on the plane, ex: A1=[0 0 4]
% The second plane is represented by the normal vector N2=[3 4 -3]
% and any arbitrary point that lies on the plane, ex: A2=[0 0 -2]
% [P,N,check]=plane_intersect([2 -5 3],[0 0 4],[3 4 -3],[0 0 -2]);