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pag 742
"
....
[example of one use of setmatrix ]
matrix currentmatix   /* places on the stack the current CTM */
rx rx scale
0 0 1 0 360 arc
setmatrix
stroke

This exaple .....However, do not use this operator to perform
such operations as flipping the coordinate axes. Instead, use
the concat operator and concatenate to the current transformation
matrix. Ordinarily, Postscrip programs should modify the CTM
rather than replacing it."


Chema