p?lacp2

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?lacp2

Copies all or part of a distributed matrix to another distributed matrix.

Syntax

call pslacp2(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

call pdlacp2(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

call pclacp2(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

call pzlacp2(uplo, m, n, a, ia, ja, desca, b, ib, jb, descb)

Description

The p?lacp2routine copies all or part of a distributed matrix A to another distributed matrix B. No communication is performed, p?lacp2 performs a local copy sub(A):= sub(B), where sub(A) denotes A(ia:ia+m-1, a:ja+n-1) and sub(B) denotes B(ib:ib+m-1, jb:jb+n-1).

p?lacp2 requires that only dimension of the matrix operands is distributed.

Input Parameters

uplo

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

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

= 'L': Lower triangular part is copied; 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 pslacp2

DOUBLE PRECISION for pdlacp2

COMPLEX for pclacp2

COMPLEX*16 for pzlacp2.

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 m-by-n 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 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 B.

Output Parameters

b

(local).

REAL for pslacp2

DOUBLE PRECISION for pdlacp2

COMPLEX for pclacp2

COMPLEX*16 for pzlacp2.

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?lacp2

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