Re: [Gretl-devel] matrix multiplication question

Allin et al, <quote> Proper addition is of course commutative, but the "extended addition" that I'm talking about here maybe is not. I tend to think of the left-hand operand as the "posit", so to speak, and the right-hand operand as the increment (or decrement, in the case of subtraction). And I reckon I can attach a good sense to the case where an m x n matrix is the posit and the increment or decrement is a scalar (applied to all elements of the posit). But I feel queasy about the case where the posit is a scalar value and the increment/decrement is an m x n matrix. This seems a step too far. This may become moot if we decide to tighten up and insist on the dot operators, but I thought I'd just mention it. </quote> My first thought is that if the manual says (mxn) + scalar is allowed, then the order shouldn't matter. Addition is addition. Plus (so to speak), the alternative you suggest is afaik different from the treatments in Matlab, Gauss, etc. So I think if you want to insist on left-vs-right positioning, that should be documented.