How rotate a dscrete 2D curve around the Y axis for obtaining the surface?
in [Matlab]
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From: Yung Olivier on 18 Jun 2010 10:00 Hey everybody: Now there is a 1×100 array，using plot(), we can get its curve, but how to obtain its surface with rotating around Y axis? Thank you very much!
From: Roger Stafford on 18 Jun 2010 19:54
"Yung Olivier" <gyolive(a)qq.com> wrote in message <hvfu5l$gg0$1(a)fred.mathworks.com>... > Hey everybody: > Now there is a 1×100 array，using plot(), we can get its curve, but how to obtain its surface with rotating around Y axis? > Thank you very much! If you were plotting an x-array against a y-array, then you can do this: n = 100; [rho,theta] = meshgrid(x,linspace(0,2*pi,n)); Z = repmat(y(:).',n,1); X = rho.*cos(theta); Y = rho.*sin(theta); surf(X,Y,Z) In the surface here the curve will be rotated about the z-axis of the three-dimensional surf space. If instead you were plotting y against its own index, just use x = 1:m in the above where m is the length of y. Roger Stafford |