Javascript IRR (Internal rate of return) Formula Accuracy

Question

I\'m using a IRR function in javascript to create calculation a that is done in excel using its own IRR function. The problem is mine is little off and I have no idea why. Here\

Answer 1

Don't set your min IRR to 0. That is what bounds your answer. Try allowing it to go negative. Also don't try to calc an IRR on one number.