Computes the exponential integral of vector elements.
Buffer API:
void expint1(queue& exec_queue, int64_t n, buffer<T,1>& a, buffer<T,1>& y, uint64_t mode = mode::not_defined, error_handler<T> errhandler = {} );
USM API:
event expint1(queue& exec_queue, int64_t n, T* a, T* y, vector_class<event>* depends, uint64_t mode = mode::not_defined, error_handler<T> errhandler = {} );
expint1 supports the following precisions and devices:
T | Devices supported |
---|---|
float | Host and CPU |
double | Host and CPU |
The expint1(a) function computes the exponential integral of vector elements of the input vector a and writes them to the output vector y.
For positive real values x, this can be written as:
.
For negative real values x, the result is defined as NAN.
Argument | Result | Error Code |
---|---|---|
x < +0 | QNAN | status::errdom |
+0 | +∞ | status::sing |
-0 | +∞ | status::sing |
+∞ | +0 | |
-∞ | QNAN | status::errdom |
QNAN | QNAN | |
SNAN | QNAN |
Buffer API:
The queue where the routine should be executed.
Specifies the number of elements to be calculated.
The buffer a containing input vector of size n.
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.
Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.
USM API:
The queue where the routine should be executed.
Specifies the number of elements to be calculated.
Pointer a to the input vector of size n.
Vector of dependent events (to wait for input data to be ready).
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.
Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.
Buffer API:
The buffer y containing the output vector of size n.
USM API:
Pointer y to the output vector of size n.
Function end event.
An example of how to use expint1can be found in the Intel® oneMKL installation directory, under:
examples/sycl/vml/vexpint1.cpp