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*To*: jpiitula@xxxxxxxxxxxxxxxx (Jussi Piitulainen)*Subject*: Re: linear -> affine and shapes are immutable*From*: Brad Lucier <lucier@xxxxxxxxxxxxxxx>*Date*: Tue, 13 Nov 2001 03:36:05 -0500 (EST)*Cc*: lucier@xxxxxxxxxxxxxxx, srfi-25@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*Delivered-to*: srfi-25@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*In-reply-to*: <qotg07jrv8i.fsf@xxxxxxxxxxxxxxxxxxxxxxx> from "Jussi Piitulainen" at Nov 13, 2001 09:22:05 AM

> > lucier@xxxxxxxxxxxxxxx writes: > > > I would suggest that "affine" would be a better name than > > "linear" for the properties of the access functions. Linear > > is OK (as in linear as opposed to quadratic polynomials), but in > > this context with all the "vector"s and "array"s, I think affine > > would be better. > > Interesting. A book on Java 2D graphics defines affine transformation > as "one in which parallel lines are still parallel after ...". > > I cannot judge which is better. I don't want to put in anything about > parallel lines. Does "each index is a sum of multiples" match "affine" > at least as well as it matches "linear"? An affine map is a linear map plus a constant. Brad

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