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

Export assignment kernelCos

• kernelCos(x: number, y: number): number

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

  Notes

  • For increased accuracy, the number for which the cosine 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 two numbers must satisfy |y| < 0.5 * ulp( x ).

  Parameters

  • x: number

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

  • y: number

    tail of x

  Returns number

  cosine

  Example

  var v = kernelCos( 0.0, 0.0 );
  // returns ~1.0

  Example

  var v = kernelCos( 3.141592653589793/6.0, 0.0 );
  // returns ~0.866

  Example

  var v = kernelCos( 0.785, -1.144e-17 );
  // returns ~0.707

  Example

  var v = kernelCos( NaN, 0.0 );
  // returns NaN