File: rotate.man

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.TH rotate 2 "April 1993" "Scilab Group" "Scilab Function" 
.so ../sci.an
.SH NAME
rotate - geometric rotation of a set of points  
.SH CALLING SEQUENCE
.nf
[xy1]=rotate(xy,[theta,orig])
.fi
.SH PARAMETERS 
.TP 15
xy,xy1  
:  matrices of size (2,.)
.TP
theta 
: real (angle en radian) , (default value=0)
.TP
orig 
: center of the rotation [0;0] if omitted 
.SH DESCRIPTION
\fVxy1(:,i) = M(theta) *xy(:,i) + orig\fR
where \fVM\fR stands for a rotation matrix of angle \fVtheta\fR
.SH EXAMPLE 
.nf 
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

.fi