External module "math/base/special/log1p/docs/types/index.d"

Export assignment log1p

• log1p(x: number): number

• Evaluates the natural logarithm of 1+x.

  Notes

  • For x < -1, the function returns NaN, as the natural logarithm is not defined for negative numbers.

  Parameters

  • x: number

    input value

  Returns number

  the natural logarithm of 1+x

  Example

  var v = log1p( 4.0 );
  // returns ~1.609

  Example

  var v = log1p( -1.0 );
  // returns -Infinity

  Example

  var v = log1p( 0.0 );
  // returns 0.0

  Example

  var v = log1p( -0.0 );
  // returns -0.0

  Example

  var v = log1p( -2.0 );
  // returns NaN

  Example

  var v = log1p( NaN );
  // returns NaN