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How to figure out if a tranform has no inverse?

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How to figure out if a tranform has no inverse?

Subject: How to figure out if a tranform has no inverse?
From: Antonio Nunes <email@hidden>
Date: Sat, 21 Apr 2007 23:01:21 +0100

Hi,

Looking for "NSAffineTransform inverse" and similar searches both in the docs and on the net doesn't give me any hits that discuss how to find out if a transform has no inverse, rather than getting an exception raised when it hasn't. Is there any way to figure this out when given a transform?

António

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