Intel® Math Kernel Library 2019 Developer Reference - Fortran
Computes a natural logarithm of vector elements that are increased by 1.
call vslog1p( n, a, y )
call vmslog1p( n, a, y, mode )
call vdlog1p( n, a, y )
call vmdlog1p( n, a, y, mode )
Name |
Type |
Description |
|---|---|---|
n |
INTEGER, INTENT(IN) |
Specifies the number of elements to be calculated. |
a |
DOUBLE PRECISION for vdlog1p, vmdlog1p REAL, INTENT(IN) for vslog1p, vmslog1p DOUBLE PRECISION, INTENT(IN) for vdlog1p, vmdlog1p |
Array that specifies the input vector a. |
mode |
INTEGER(KIND=8), INTENT(IN) |
Overrides global VM mode setting for this function call. See vmlSetMode for possible values and their description. |
Name |
Type |
Description |
|---|---|---|
y |
DOUBLE PRECISION for vdlog1p, vmdlog1p REAL, INTENT(OUT) for vslog1p, vmslog1p DOUBLE PRECISION, INTENT(OUT) for vdlog1p, vmdlog1p |
Array that specifies the output vector y. |
The v?Log1p function computes a natural logarithm of vector elements that are increased by 1.
| Argument | Result | VM Error Status | Exception |
|---|---|---|---|
| -1 | -∞ | VML_STATUS_SING | ZERODIVIDE |
| X < -1 | QNAN | VML_STATUS_ERRDOM | INVALID |
| +0 | +0 | ||
| -0 | -0 | ||
| -∞ | QNAN | VML_STATUS_ERRDOM | INVALID |
| +∞ | +∞ | ||
| QNAN | QNAN | ||
| SNAN | QNAN | INVALID |