Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

ID 766686
Date 3/31/2023
Public

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v?Powr

Computes a to the power b for elements of two vectors, where the elements of vector argument a are all non-negative.

Syntax

call vspowr (n, a, b, y )

call vspowri(n, a, inca, b, incb, y, incy)

call vmspowr (n, a, b, y, mode )

call vmspowri(n, a, inca, b, incb, y, incy, mode)

call vdpowr (n, a, b, y )

call vdpowri(n, a, inca, b, incb, y, incy)

call vmdpowr (n, a, b, y, mode )

call vmdpowri(n, a, inca, b, incb, y, incy, mode)

Include Files
  • mkl_vml.f90
Input Parameters

Name

Type

Description

n

INTEGER

Specifies the number of elements to be calculated.

a, b

REAL for vsPowr

REAL for vmsPowr

DOUBLE PRECISION for vdPowr

DOUBLE PRECISION for vmdPowr

Pointers to arrays containing the input vectors a and b.

inca, incb, incy

INTEGER, INTENT(IN)

Specifies increments for the elements of a, b, and y.

mode

INTEGER (KIND=8)

Overrides the global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Output Parameters

Name

Type

Description

y

REAL for vsPowr

REAL for vmsPowr

DOUBLE PRECISION for vdPowr

DOUBLE PRECISION for vmdPowr

Pointer to an array containing the output vector y.

Description

The v?Powr function raises each element of vector a by the corresponding element of vector b. The elements of a are all nonnegative (ai 0).

Precision Overflow Thresholds for Real Function v?Powr
Data Type Threshold Limitations on Input Parameters
single precision ai < (FLT_MAX)1/bi
double precision ai < (DBL_MAX)1/bi

Special values and VM Error Status treatment for v?Powr function are the same as for v?Pow, unless otherwise indicated in this table:

Special values for Real Function v?Powr(x)
Argument 1 Argument 2 Result VM Error Status Exception
x < 0 any value y NAN VML_STATUS_ERRDOM INVALID
0 < x < ±0 1    
±0 - < y < 0 +    
±0 - +    
±0 y > 0 +0    
1 - < y < 1    
±0 ±0 NAN    
+ ±0 NAN    
1 + NAN    
x 0 NAN NAN    
NAN any value y NAN    
0 < x <1 - +    
x > 1 - +0    
0 x < 1 + +0    
x > 1 + +    
+ x < +0 +0    
+ x > +0 +    
QNAN QNAN QNAN VML_STATUS_ERRDOM  
QNAN SNAN QNAN VML_STATUS_ERRDOM INVALID
SNAN QNAN QNAN VML_STATUS_ERRDOM INVALID
SNAN SNAN QNAN VML_STATUS_ERRDOM INVALID

See Also