Computes inverse tangent of vector elements.
FORTRAN:
call vsatan( n, a, y )
call vmsatan( n, a, y, mode )
call vdatan( n, a, y )
call vmdatan( n, a, y, mode )
call vcatan( n, a, y )
call vmcatan( n, a, y, mode )
call vzatan( n, a, y )
call vmzatan( n, a, y, mode )
C:
vsAtan( n, a, y );
vmsAtan( n, a, y, mode );
vdAtan( n, a, y );
vmdAtan( n, a, y, mode );
vcAtan( n, a, y );
vmcAtan( n, a, y, mode );
vzAtan( n, a, y );
vmzAtan( n, a, y, mode );
Name |
Type |
Description |
|---|---|---|
n |
FORTRAN 77: INTEGER Fortran 90: INTEGER, INTENT(IN) C: const int |
Specifies the number of elements to be calculated. |
a |
FORTRAN 77: REAL for vsatan, vmsatan DOUBLE PRECISION for vdatan, vmdatan COMPLEX for vcatan, vmcatan DOUBLE COMPLEX for vzatan, vmzatan Fortran 90: REAL, INTENT(IN) for vsatan, vmsatan DOUBLE PRECISION, INTENT(IN) for vdatan, vmdatan COMPLEX, INTENT(IN) for vcatan, vmcatan DOUBLE COMPLEX, INTENT(IN) for vzatan, vmzatan C: const float* for vsAtan, vmsAtan const double* for vdAsin, vmdAtan const MKL_Complex8* for vcAtan, vmcAtan const MKL_Complex16* for vzAsin, vmzAtan |
FORTRAN: Array that specifies the input vector a. C: Pointer to an array that contains the input vector a. |
mode |
FORTRAN 77: INTEGER*8 Fortran 90: INTEGER(KIND=8), INTENT(IN) C: const MKL_INT64 |
Overrides global VML mode setting for this function call. See vmlSetMode for possible values and their description. |
Name |
Type |
Description |
|---|---|---|
y |
FORTRAN 77: REAL for vsatan, vmsatan DOUBLE PRECISION for vdatan, vmdatan COMPLEX for vcatan, vmcatan DOUBLE COMPLEX for vzatan, vmzatan Fortran 90: REAL, INTENT(OUT) for vsatan, vmsatan DOUBLE PRECISION, INTENT(OUT) for vdatan, vmdatan COMPLEX, INTENT(OUT) for vcatan, vmcatan DOUBLE COMPLEX, INTENT(OUT) for vzatan, vmzatan C: float* for vsAtan, vmsAtan double* for vdAsin, vmdAtan MKL_Complex8* for vcAtan, vmcAtan MKL_Complex16* for vzAsin, vmzAtan |
FORTRAN: Array that specifies the output vector y. C: Pointer to an array that contains the output vector y. |
The v?Atan function computes inverse tangent of vector elements.
| Argument | Result | VML Error Status | Exception |
|---|---|---|---|
| +0 | +0 | ||
| -0 | -0 | ||
| +∞ | +π/2 | ||
| -∞ | -π/2 | ||
| QNAN | QNAN | ||
| SNAN | QNAN | INVALID |
Specifications for special values of the complex functions are defined according to the following formula
Atan(z) = -i*Atanh(i*z).