p?lacpy

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 3/31/2023

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p?lacpy

Copies all or part of one two-dimensional array to another.

Syntax

call pslacpy(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

call pdlacpy(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

call pclacpy(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

call pzlacpy(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

Description

The p?lacpyroutine copies all or part of a distributed matrix A to another distributed matrix B. No communication is performed, p?lacpy performs a local copy sub(B):= sub(A), where sub(A) denotes A(ia:ia+m-1,ja:ja+n-1) and sub(B) denotes B(ib:ib+m-1,jb:jb+n-1).

Input Parameters

uplo

(global) CHARACTER. Specifies the part of the distributed matrix sub(A) to be copied:

= 'U': Upper triangular part; the strictly lower triangular part of sub(A) is not referenced;

= 'L': Lower triangular part; the strictly upper triangular part of sub(A) is not referenced.

Otherwise: all of the matrix sub(A) is copied.

m

(global) INTEGER.

The number of rows in the distributed matrix sub(A). (m≥0).

n

(global) INTEGER.

The number of columns in the distributed matrix sub(A). (n≥0).

a

(local).

REAL for pslacpy

DOUBLE PRECISION for pdlacpy

COMPLEX for pclacpy

COMPLEX*16 for pzlacpy.

Pointer into the local memory to an array of size (lld_a, LOCc(ja+n-1)).

On entry, this array contains the local pieces of the distributed matrix sub(A).

ia, ja

(global) INTEGER. The row and column indices in the global matrix A indicating the first row and the first column of the matrix sub(A), respectively.

desca

(global and local) INTEGER array of size dlen_. The array descriptor for the distributed matrix A.

ib, jb

(global) INTEGER. The row and column indices in the global matrix B indicating the first row and the first column of sub(B) respectively.

descb

(global and local) INTEGER array of size dlen_. The array descriptor for the distributed matrix A.

Output Parameters

b

(local).

REAL for pslacpy

DOUBLE PRECISION for pdlacpy

COMPLEX for pclacpy

COMPLEX*16 for pzlacpy.

Pointer into the local memory to an array of size (lld_b, LOCc(jb+n-1)). This array contains on exit the local pieces of the distributed matrix sub(B) set as follows:

if uplo = 'U', B(ib+i-1, jb+j-1) = A(ia+i-1, ja+j-1), 1≤i≤j, 1≤j≤n;

if uplo = 'L', B(ib+i-1, jb+j-1) = A(ia+i-1, ja+j-1), j≤i≤m, 1≤j≤n;

otherwise, B(ib+i-1, jb+j-1) = A(ia+i-1, ja+j-1), 1≤i≤m, 1≤j≤n.

Parent topic: ScaLAPACK Auxiliary Routines

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

p?lacpy

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