copysign

Returns vector of elements of one argument with signs changed to match other argument elements.

Syntax

Buffer API:

void copysign(queue &exec_queue, int64_t n, buffer<T, 1> &a, buffer<T, 1> &b, buffer<T, 1> &y, uint64_t mode = mode::not_defined)

USM API:

event copysign(queue &exec_queue, int64_t n, T *a, T *b, T *y, vector_class<event> *depends, uint64_t mode = mode::not_defined)

copysign supports the following precisions.

T
float
double

Description

The copysign(a,b) function returns the first vector argument elements with the sign changed to match the sign of the second vector argument’s corresponding elements.

Argument 1	Argument 2	Result	Error Code
any value	positive value	+any value
any value	negative value	-any value

The copysign(a,b) function does not generate any errors.

Input Parameters

Buffer API:

exec_queue

The queue where the routine should be executed.

n

Specifies the number of elements to be calculated.

a

The buffer a containing 1st input vector of size n.

b

The buffer b containing 2nd input vector of size n.

mode

Overrides the global VM mode setting for this function call. See set_mode function for possible values and their description. This is an optional parameter. The default value is mode::not_defined.

USM API:

exec_queue

The queue where the routine should be executed.

n

Specifies the number of elements to be calculated.

a

Pointer a to the 1st input vector of size n.

b

Pointer b to the 2nd input vector of size n.

depends

Vector of dependent events (to wait for input data to be ready).

mode

Overrides the global VM mode setting for this function call. See the set_mode function for possible values and their description. This is an optional parameter. The default value is mode::not_defined.

Output Parameters

Buffer API:

y

The buffer y containing the output vector of size n.

USM API:

y

Pointer y to the output vector of size n.

return value (event)

Function end event.

Example

An example of how to use copysign can be found in the oneMKL installation directory, under:

examples/sycl/vml/vcopysign.cpp

Parent topic: Miscellaneous VM Functions