Developer Reference for Intel® oneAPI Math Kernel Library for C
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v?Acos
vsAcos vdAcos vcAcos vzAcos vmsAcos vmdAcos vmcAcos vmzAcos Computes inverse cosine of vector elements.
Syntax
vhAcos ( n , a , y ) ;
vhAcosI(n, a, inca, y, incy);
vmhAcos ( n , a , y , mode ) ;
vmhAcosI(n, a, inca, y, incy, mode);
vsAcos ( n , a , y ) ;
vsAcosI(n, a, inca, y, incy);
vmsAcos ( n , a , y , mode ) ;
vmsAcosI(n, a, inca, y, incy, mode);
vdAcos ( n , a , y ) ;
vdAcosI(n, a, inca, y, incy);
vmdAcos ( n , a , y , mode ) ;
vmdAcosI(n, a, inca, y, incy, mode);
vcAcos ( n , a , y ) ;
vcAcosI(n, a, inca, y, incy);
vmcAcos ( n , a , y , mode ) ;
vmcAcosI(n, a, inca, y, incy, mode);
vzAcos ( n , a , y ) ;
vzAcosI(n, a, inca, y, incy);
vmzAcos ( n , a , y , mode ) ;
vmzAcosI(n, a, inca, y, incy, mode);
Include Files
mkl.h
Input Parameters
Name |
Type |
Description |
|---|---|---|
n |
const int |
Specifies the number of elements to be calculated. |
a |
const _Float16* for vhAcos , vmhAcos const float* for vsAcos , vmsAcos const double* for vdAcos , vmdAcos const MKL_Complex8* for vcAcos , vmcAcos const MKL_Complex16* for vzAcos , vmzAcos |
Pointer to an array that contains the input vector a . |
inca , incy |
const MKL_INT |
Specifies increments for the elements of a and y . |
mode |
const MKL_INT64 |
Overrides global VM mode setting for this function call. See vmlSetMode (Sets a new mode for VM functions according to the mode parameter and stores the previous VM mode to oldmode.) for possible values and their description. |
Output Parameters
Name |
Type |
Description |
|---|---|---|
y |
_Float16* for vhAcos , vmhAcos float* for vsAcos , vmsAcos double* for vdAcos , vmdAcos MKL_Complex8* for vcAcos , vmcAcos MKL_Complex16* for vzAcos , vmzAcos |
Pointer to an array that contains the output vector y . |
Description
The v?Acos function computes inverse cosine of vector elements.
Special Values for Real Function v?Acos(x)
Argument |
Result |
VM Error Status |
Exception |
|---|---|---|---|
+0 |
|
||
-0 |
|
||
+1 |
+0 |
||
-1 |
|
||
\(|X| > 1\) |
QNAN |
VML_STATUS_ERRDOM |
INVALID |
|
QNAN |
VML_STATUS_ERRDOM |
INVALID |
|
QNAN |
VML_STATUS_ERRDOM |
INVALID |
QNAN |
QNAN |
||
SNAN |
QNAN |
INVALID |
See Special Value Notations for the conventions used in the table below.
Special Values for Complex Function v?Acos(z)
RE(z) i · IM(z) |
|
-X |
-0 |
+0 |
+X |
|
NAN |
|---|---|---|---|---|---|---|---|
+i · ∞ |
+3 · π /4-i · ∞ |
|
|
|
|
|
QNAN-i · ∞ |
+i · Y |
|
+0-i · ∞ |
QNAN+i · QNAN |
||||
+i · 0 |
|
|
|
+0-i · ∞ |
QNAN+i · QNAN |
||
-i · 0 |
|
|
|
+0+i · ∞ |
QNAN+i · QNAN |
||
-i · Y |
|
+0+i · ∞ |
QNAN+i · QNAN |
||||
-i · ∞ |
+3 π /4+i · ∞ |
|
|
|
|
|
QNAN+i · ∞ |
+i · NAN |
QNAN+i · ∞ |
QNAN+i · QNAN |
|
|
QNAN+i · QNAN |
QNAN+i · ∞ |
QNAN+i · QNAN |
Notes:
raises INVALID exception when real or imaginary part of the argument is SNAN
\(Acos(CONJ(z))=CONJ(Acos(z))\) .