 | | Re: LPub4 Alpha3 available —Travis Cobbs
| | | | (...) Actually, the matrix can have negative coefficients without being a mirror. If I remember correctly, mirror detection is a matter of checking if the determinant of the matrix is positive or negative. If the determinant is negative, then the (...) (16 years ago, 28-Jun-08, to lugnet.cad)
| | | | | | | | | | Re: LPub4 Alpha3 available —Timothy Gould
| | | | | (...) You remember correctly. A 90 or 270 degree rotation will have a negative and positive coefficient off the diagonal while a 180 will have two negatives on the diagonal. Tim (16 years ago, 28-Jun-08, to lugnet.cad)
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