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

Export assignment betainc

• betainc(x: number, a: number, b: number, regularized?: undefined | false | true, upper?: undefined | false | true): number

• Evaluates the incomplete beta function.

  Notes

  • The regularized and upper parameters specify whether to evaluate the non-regularized and/or upper incomplete beta functions, respectively.
  • If provided x < 0 or x > 1, the function returns NaN.
  • If provided a < 0 or b < 0, the function returns NaN.

  Parameters

  • x: number

    function parameter

  • a: number

    function parameter

  • b: number

    function parameter

  • Optional regularized: undefined | false | true

    boolean indicating if the function should evaluate the regularized or non-regularized incomplete beta function (default: true)

  • Optional upper: undefined | false | true

    boolean indicating if the function should return the upper tail of the incomplete beta function (default: false)

  Returns number

  function value

  Example

  var y = betainc( 0.5, 2.0, 2.0 );
  // returns 0.5

  Example

  var y = betainc( 0.5, 2.0, 2.0, false );
  // returns ~0.083

  Example

  var y = betainc( 0.2, 1.0, 2.0 );
  // returns 0.36