External module "math/base/special/polygamma/docs/types/index.d"

Export assignment polygamma

• polygamma(n: number, x: number): number

• Evaluates the polygamma function.

  Notes

  • If n is not a nonnegative integer, the function returns NaN.
  • If x is zero or a negative integer, the function returns NaN.

  Parameters

  • n: number

    order of derivative

  • x: number

    input value

  Returns number

  (n+1)'th derivative

  Example

  var v = polygamma( 3, 1.2 );
  // returns ~3.245

  Example

  var v = polygamma( 5, 1.2 );
  // returns ~41.39

  Example

  var v = polygamma( 3, -4.9 );
  // returns ~60014.239

  Example

  var v = polygamma( 2.5, -1.2 );
  // returns NaN

  Example

  var v = polygamma( -1, 5.3 );
  // returns NaN

  Example

  var v = polygamma( 2, -2.0 );
  // returns NaN

  Example

  var v = polygamma( NaN, 2.1 );
  // returns NaN

  Example

  var v = polygamma( 1, NaN );
  // returns NaN

  Example

  var v = polygamma( NaN, NaN );
  // returns NaN