## Developer Reference

• 2020.2
• 07/15/2020
• Public Content
Contents

# cblas_?axpy_batch

Computes a group of vector-scalar products added to a vector.

## Syntax

Description
The
cblas_?axpy_batch
routines perform a series of scalar-vector product added to a vector. They are similar to the
cblas_?axpy
routine counterparts, but the
cblas_?axpy_batch
routines perform vector operations with a group of vectors. The groups contain vectors with the same parameters.
The operation is defined as
```idx = 0
for i = 0 … group_count – 1
n, alpha, incx, incy and group_size at position i in n_array, alpha_array, incx_array, incy_array and group_size_array
for j = 0 … group_size – 1
x and y are vectors of size n at position idx in x_array and y_array
y := alpha * x + y
idx := idx + 1
end for
end for```
The number of entries in
x_array
, and
y_array
is
total_batch_count
= the sum of all of the
group_size
entries.
Input Parameters
n_array
Array of size
group_count
. For the group
i
,
n
i
=
n_array[i]
is the number of elements in vectors
x
and
y
.
alpha_array
Array of size
group_count
. For the group
i
,
alpha
i
=
alpha_array[i]
is the scalar
alpha
.
x_array
Array of size
total_batch_count
of pointers used to store
x
vectors. The array allocated for the
x
vectors of the group
i
must be of size at least (1 + (
n
i
– 1)*abs(
incx
i
)). See Matrix and Vector Storage for more details.
incx_array
Array of size
group_count
. For the group
i
,
incx
i
=
incx_array[i]
is the stride of vector
x
.
y_array
Array of size
total_batch_count
of pointers used to store
y
vectors. The array allocated for the
y
vectors of the group
i
must be of size at least (1 + (
n
i
– 1)*abs(
incy
i
)). See Matrix and Vector Storage for more details.
incy_array
Array of size
group_count
. For the group
i
,
incy
i
=
incy_array[i]
is the stride of vector
y
.
group_count
Number of groups. Must be at least 0.
group_size_array
Array of size
group_count
. The element
group_size_array[i]
is the number of vector in the group
i
. Each element in
group_size_array
must be at least 0.
Output Parameters
y_array
Array of pointers holding the
total_batch_count
updated vector
y
.

#### Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804