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

Export assignment negalucas

• negalucas(n: number): number

• Computes the nth negaLucas number.

  Notes

  • The negaLucas numbers follow the recurrence relation L_{n-2} = L_{n} - L_{n-1} with seed values L_0 = 2 and L_{-1} = -1.
  • If |n| is greater than 76, the function returns NaN as larger negaLucas numbers cannot be accurately represented due to limitations of double-precision floating-point format.
  • If not provided a non-positive integer value, the function returns NaN.

  Parameters

  • n: number

    the negaLucas number to compute

  Returns number

  negaLucas number

  Example

  var y = negalucas( 0 );
  // returns 2

  Example

  var y = negalucas( -1 );
  // returns -1

  Example

  var y = negalucas( -2 );
  // returns 3

  Example

  var y = negalucas( -3 );
  // returns -4

  Example

  var y = negalucas( -4 );
  // returns 7

  Example

  var y = negalucas( -5 );
  // returns -11

  Example

  var y = negalucas( -6 );
  // returns 18

  Example

  var y = negalucas( NaN );
  // returns NaN

  Example

  var y = negalucas( -3.14 );
  // returns NaN