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Root of polynomial equation with rational exponents

Hi .. I am working on IRR calculations and setting it up as a polynomial with exponent for each cashflow as the daytime fraction .. so it could be something like

5x(0.99) + 4x(0.76) + .... = 0

I tried using some python libraries (numpy etc) to find the solution but they are taking substantial time. Is there a good python lib/package that someone can refer,


Daniel Duffy

C++ author, trainer
Off the top of my head

numba to parallelise code for each flow
Which solver does IRR use?

And is your own code efficient?