copysign

copysign(x1: array, x2: array, /) → array

Composes a floating-point value with the magnitude of x1_i and the sign of x2_i for each element of the input array x1.

Parameters:

  • x1 (array) – input array containing magnitudes. Should have a real-valued floating-point data type.

  • x2 (array) – input array whose sign bits are applied to the magnitudes of x1. Must be compatible with x1 (see Broadcasting). Should have a real-valued floating-point data type.

Returns:

out (array) – an array containing the element-wise results. The returned array must have a floating-point data type determined by Type Promotion Rules.

Notes

Special cases

For real-valued floating-point operands, let |x| be the absolute value, and if x1_i is not NaN,

  • If x2_i is less than 0, the result is -|x1_i|.

  • If x2_i is -0, the result is -|x1_i|.

  • If x2_i is +0, the result is |x1_i|.

  • If x2_i is greater than 0, the result is |x1_i|.

  • If x2_i is NaN and the sign bit of x2_i is 1, the result is -|x1_i|.

  • If x2_i is NaN and the sign bit of x2_i is 0, the result is |x1_i|.

  • If x1_i is NaN and x2_i is less than 0, the result is NaN with a sign bit of 1.

  • If x1_i is NaN and x2_i is -0, the result is NaN with a sign bit of 1.

  • If x1_i is NaN and x2_i is +0, the result is NaN with a sign bit of 0.

  • If x1_i is NaN and x2_i is greater than 0, the result is NaN with a sign bit of 0.

  • If x1_i is NaN and x2_i is NaN and the sign bit of x2_i is 1, the result is NaN with a sign bit of 1.

  • If x1_i is NaN and x2_i is NaN and the sign bit of x2_i is 0, the result is NaN with a sign bit of 0.

New in version 2023.12.