Why Matlab's IRR (internal rate of return) is much slower than Excel's

Question

Weijun 2012-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/26983-why-matlab-s-irr-internal-rate-of-return-is-much-slower-than-excel-s

回答： condor 2014-9-29

I am converting a financial cash flow model from Excel VBA to matlab. My code is much faster after vectorization, however to my surprise, my matlab code spent most of its time computing the internal rate of return (IRR) of a set of cash flows. (Let's say I have a 10000 x 36 matrix) containing 10000 iteration of cash flow of 36 month. VBA IRR or Excel's spreadsheet function IRR spends about 1 second finding 10000 IRRs (I believe it doing some kind of goal seek.) However, it takes Matlab 14'' to do that. I also try to write my own Matlab IRR function using fzero and loop through 10000 cash flows, but it's on the same scale of time in computing if not slower.

So I am wondering how Excel can do it so fast? Is there a better way to compute IRR in Matlab?

Thanks!