**CIGAL Reference Manual, Chapter 3 (Functions): flip**
===== Flip -- Flip a matrix variable about the horizontal or vertical axis =====
**usage: newimage = flip(oldimage,mode)**

FLIP does a 180-degree rotation of a matrix (eg. image) variable about either the
X axis (vertical flip) or the Y axis (horizontal flip).  In both cases the origin
for the rotation is the center of the matrix.

MODE selects which rotation to perform:
     MODE = 0     - No rotation, simply copies the matrix
            1     - Flip about the Y axis (flips left to right)
            2     - Flip about the X axis (flips top to bottom)
            4     - Flip about the diagonal (top left to bottom right)

Note: The X and Y axis flips can be combined in a single operation (MODE=3) but
neither of these can be combined with a diagonal flip (MODE=4).

**See Also:**\\
[[jvs:cigal|CIGAL Home]], 
[[jvs:cigal:manual|CIGAL Manual]], 
[[jvs:cigal:manual:chapter3|Functions List]], 
[[jvs:cigal:manual:help|Manual Help]]