File: rotate.cat

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rotate(2)                      Scilab Function                      rotate(2)
NAME
  rotate - geometric rotation of a set of points

CALLING SEQUENCE
  [xy1]=rotate(xy,[theta,orig])

PARAMETERS

  xy,xy1         :  matrices of size (2,.)

  theta          : real (angle en radian) , (default value=0)

  orig           : center of the rotation [0;0] if omitted

DESCRIPTION
  xy1(:,i) = M(theta) *xy(:,i) + orig where M stands for a rotation matrix of
  angle theta

EXAMPLE
  xsetech([0,0,1,1],[-1,-1,1,1])
  xy=[(0:0.1:10);sin(0:0.1:10)]/10;
  for i=2*%pi*(0:10)/10,[xy1]=rotate(xy,i);
          xpoly(xy1(1,:),xy1(2,:),"lines")
  end