External module "math/base/special/kernel-tan/docs/types/index.d"

Export assignment kernelTan

• kernelTan(x: number, y: number, k: -1 | 1): number

• Computes the tangent of a number on [-π/4, π/4].

  Notes

  • For increased accuracy, the number for which the tangent should be evaluated can be supplied as a double-double number (i.e., a non-evaluated sum of two double-precision floating-point numbers x and y).
  • The numbers x and y must satisfy |y| < 0.5 * ulp( x ).
  • If either x or y is NaN, the function returns NaN.

  Parameters

  • x: number

    input value (in radians, assumed to be bounded by ~π/4 in magnitude)

  • y: number

    tail of x

  • k: -1 | 1

    indicates whether tan (if k = 1) or -1/tan (if k = -1) is returned

  Returns number

  tangent

  Example

  var out = kernelTan( 3.141592653589793/4.0, 0.0, 1 );
  // returns ~1.0

  Example

  var out = kernelTan( 3.141592653589793/4.0, 0.0, -1 );
  // returns ~-1.0

  Example

  var out = kernelTan( 3.141592653589793/6.0, 0.0, 1 );
  // returns ~0.577

  Example

  var out = kernelTan( 0.664, 5.288e-17, 1 );
  // returns ~0.783

  Example

  var out = kernelTan( NaN, 0.0, 1 );
  // returns NaN

  Example

  var out = kernelTan( 3.0, NaN, 1 );
  // returns NaN

  Example

  var out = kernelTan( NaN, NaN, 1 );
  // returns NaN