# ExecX1D

Computes convolution or correlation for one-dimensional case with the fixed first operand vector.

## Syntax

Fortran:

status = vslsconvexecx1d(task, y, ystride, z, zstride)

status = vsldconvexecx1d(task, y, ystride, z, zstride)

status = vslscorrexecx1d(task, y, ystride, z, zstride)

status = vsldcorrexecx1d(task, y, ystride, z, zstride)

C:

status = vslsConvExecX1D(task, y, ystride, z, zstride);

status = vsldConvExecX1D(task, y, ystride, z, zstride);

status = vslsCorrExecX1D(task, y, ystride, z, zstride);

status = vsldCorrExecX1D(task, y, ystride, z, zstride);

## Description

Each of the ExecX1D routines computes convolution or correlation of one-dimensional (assuming that dims =1)data provided by the arrays x and y and then stores the results in the array z. These routines represent a special version of the operation, which expects that the first operand vector was set on the task construction stage.

Parameters of the operation are read from the task descriptor created previously by a corresponding NewTaskX1D constructor and pointed to by task. If task is NULL, no operation is done.

Using this form of execution routines is recommended when you need to compute multiple one-dimensional convolutions or correlations with the same data vector in array x against different vectors in array y. This helps improve performance by eliminating unnecessary overhead in repeated computation of intermediate data required for the operation.

## Input Parameters

Name | Type | Description
--- | --- | ---
task | FORTRAN: TYPE(VSL_CONV_TASK) for vslsconvexecx1d and vsldconvexecx1d TYPE(VSL_CORR_TASK) for vslscorrexecx1d and vsldcorrexecx1d C: VSLConvTaskPtr for vslsConvExecX1D and vsldConvExecX1D VSLCorrTaskPtr for vslsCorrExecX1D and vsldCorrExecX1D | Pointer to the task descriptor.
x , y | FORTRAN: REAL(KIND=4), DIMENSION(*) for vslsconvexecx1d and vslscorrexecx1d REAL(KIND=8), DIMENSION(*) for vsldconvexecx1d and vsldcorrexecx1d C: float[] for vslsConvExecX1D and vslsCorrExecX1D double[] for vsldConvExeX1D and vsldCorrExecX1D | Pointer to array containing input data (for the second operand vector). See Data Allocation for more information.
ystride, zstride | FORTRAN: INTEGER C: int | Strides for input and output data. For more information, see stride parameters.

## Output Parameters

Name | Type | Description
--- | --- | ---
z | FORTRAN: REAL(KIND=4), DIMENSION(*) for vslsconvexecx1d and vslscorrexecx1d REAL(KIND=8), DIMENSION(*) for vsldconvexecx1d and vsldcorrexec1d C: float[] for vslsConvExecX1D and vslsCorrExecX1D double[] for vsldConvExecX1D and vsldCorrExecX1D | Pointer to the array that stores output data. See Data Allocation for more information.
status | FORTRAN: INTEGER C: int | Set to VSL_STATUS_OK if the task is executed successfully or set to non-zero error code otherwise.

Parent topic: Task Execution Routines