File: rotate.cat

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scilab 2.6-4
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rotate            Scilab Group            Scilab Function            rotate
NAME
   rotate - rotation of a set of points  
  
CALLING SEQUENCE
 xy1=rotate(xy,[theta,orig])
PARAMETERS
 xy      : matrice of size (2,.).
         
 xy1     : matrice of size (2,.).
         
 theta   : real, angle en radian; default value is 0.
         
 orig    : center of the rotation; default value is [0;0].
         
DESCRIPTION
   rotate performs a rotation with angle theta:  xy1(:,i) = M(theta) *xy
  (:,i) + orig  where M stands for the corresponding rotation matrix.
  
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