Mattias Engdegård 0e00f199cd Calc: fix binomial coefficients for negative arguments (bug#16999) ... For some values outside integers 0≤k≤n, (n choose k) gave wrong results, entered infinite recursion or used unreasonably amounts of stack space. This change fixes that and extends the function to all integer arguments using the definitions from M. J. Kronenburg (https://arxiv.org/abs/1105.3689). * lisp/calc/calc-comb.el (calcFunc-choose): Fix sign error to prevent infinite recursion and extend function to handle all integer arguments. (math-choose-iter, math-choose-float-iter): Rewrite in iterative form; no TCO in elisp yet. * test/lisp/calc/calc-tests.el (calc-tests--fac, calc-tests--choose) (calc-tests--check-choose, calc-tests--explain-choose) (calc-tests--calc-to-number): New helper functions. (calc-choose): New test.		2020-09-14 11:19:22 +02:00
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calc-tests.el	Calc: fix binomial coefficients for negative arguments (bug#16999)	2020-09-14 11:19:22 +02:00