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Diffstat (limited to 'txr.1')
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@@ -8996,6 +8996,37 @@ The cum-norm-dist function calculates an approximation to the cumulative normal distribution function: the integral, of the normal distribution function, from negative infinity to the <argument>. +.SS Functions n-choose-k and n-perm-k + +.TP +Syntax: + + (n-choose-k <n> <k>) + (n-perm-k <n> <k>) + +.TP +Description: + +The n-choose-k function computes the binomial coefficient nCk which +expresses the number of combinations of <k> items that can be chosen from +a set of <n>, where combinations are subsets. + +The n-choose-k function computes nPk: the number of permutations of size <k> +that can be drawn from a set of <n>, where permutations are sequences, +whose order is significant. + +The calculations only make sense when <n> and <k> are nonnegative integers, and +<k> does not exceed <n>. The behavior is not specified if these conditions +are not met. + +.TP +Description: + +The cum-norm-dist function calculates an approximation to the cumulative normal +distribution function: the integral, of the normal distribution function, from +negative infinity to the <argument>. + + .SS Functions fixnump, bignump, integerp, floatp, numberp .TP |