repl.txt (805B)
1 2 {{alias}}( n, x ) 3 Evaluates the polygamma function of order `n`; i.e., the (n+1)th derivative 4 of the natural logarithm of the gamma function. 5 6 If `n` is not a nonnegative integer, the function returns `NaN`. 7 8 If `x` is zero or a negative integer, the function returns `NaN`. 9 10 If provided `NaN` as either parameter, the function returns `NaN`. 11 12 Parameters 13 ---------- 14 n: integer 15 Derivative order. 16 17 x: number 18 Input value. 19 20 Returns 21 ------- 22 y: number 23 Function value. 24 25 Examples 26 -------- 27 > var v = {{alias}}( 3, 1.2 ) 28 ~3.245 29 > v = {{alias}}( 5, 1.2 ) 30 ~41.39 31 > v = {{alias}}( 3, -4.9 ) 32 ~60014.239 33 > v = {{alias}}( -1, 5.3 ) 34 NaN 35 > v = {{alias}}( 2, -1.0 ) 36 Infinity 37 38 See Also 39 -------- 40