Using flops_div() from the lightspeed toolbox by tom minka..

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Gina DiCarlo
Gina DiCarlo 2016-9-26
评论： Walter Roberson 2016-9-27
I'm using the Lightspeed toolbox created by Tom Minka to find the FLOP count for a project I'm using. For multiplication I used: addflops(flops_mul(matrix1, matrix2)); But for division (flops_div) it doesn't allow any input arguments, has anyone else used this toolbox and know how to properly use this function?

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Walter Roberson
Walter Roberson 2016-9-26
Multiply the results of flops_div by the number of scalars you are dividing.
flops_div is for scalar division, not for matrix algebra division.
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Gina DiCarlo
Gina DiCarlo 2016-9-26
Or by the number of scalars do you mean the length of the number, so in this case it would be 2 (2 and 0) and the answer would be 16?
Walter Roberson
Walter Roberson 2016-9-27
For the case of A ./ B
div_count = max(numel(A),numel(B)) * flops_div
This covers the case where one of the two might be a scalar, and also covers the case where the two are the same size. The case where the two are non-scalars of different size is an error for the ./ operator.
For the case of A / B then if B is a scalar then the operation is the same as A ./ B . For the case of A / B where B is not a scalar then that is matrix algebra division and flops_div does not cover that.

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