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From Ted Dunning <>
Subject Re: [math] Transposable linear operators
Date Thu, 12 Jan 2012 14:13:58 GMT
One such example is a text retrieval engine.  A x is easy since that is
what the engine does.  A' y is very expensive.

2012/1/12 S├ębastien Brisard <>

> In other words, I do not know how to access
> efficiently the (i, j) coefficient, but I *do* know how to compute
> efficiently A.x. There might be some cases where computing A'.x would
> still be difficult. I do not have an example here, but that's the
> reason why initially
> RealVector operateTranspose(RealVector)
> was not put in the RealLinearOperator abstract class.

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