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invert-transform

Function
Summary

Constructs the inverse of a transform.

Package

graphics-ports

Signature

invert-transform transform &optional into => inverse

Arguments

transform

A transform.

into

A transform or nil .

Values

inverse

A transform.

Description

This function constructs the inverse of transform . If T is transform and T' is its inverse, then TT ' = I. If into is non- nil it is modified to contain T' and returned, otherwise a new transform is constructed and returned.


LispWorks CAPI Reference Manual - 21 Dec 2009

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