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Scilab Help >> Graphics > transform > rotate

# rotate

rotation of a set of points

### Calling Sequence

`xy1=rotate(xy,[theta,orig])`

### Arguments

xy

matrix of size (2,.).

xy1

matrix of size (2,.).

theta

real, angle in radians; default value is 0.

orig

center of the rotation [xc;yc]; default value is [0;0].

### Description

`rotate` performs a rotation with angle `theta`:

`xy1(:,i) = M(theta) *(xy(:,i) - orig) + orig`

where `M` stands for the corresponding rotation matrix.

### Examples

```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```
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