---
name: "clacpy"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/clacpy/3lapack"
---

# clacpy(3lapack)

copies all or part of a two-dimensional matrix A to another matrix B

## NAME

CLACPY - copies all or part of a two-dimensional matrix A to another matrix B

## SYNOPSIS

- SUBROUTINE CLACPY(

  UPLO, M, N, A, LDA, B, LDB )

- CHARACTER

  UPLO

- INTEGER

  LDA, LDB, M, N

- COMPLEX

  A( LDA, \* ), B( LDB, \* )

## PURPOSE

CLACPY copies all or part of a two-dimensional matrix A to another matrix B.

## ARGUMENTS

- UPLO (input) CHARACTER\*1

  Specifies the part of the matrix A to be copied to B. = 'U':      Upper triangular part\
   \= 'L':      Lower triangular part\
   Otherwise:  All of the matrix A

- M (input) INTEGER

  The number of rows of the matrix A.  M \>= 0.

- N (input) INTEGER

  The number of columns of the matrix A.  N \>= 0.

- A (input) COMPLEX array, dimension (LDA,N)

  The m by n matrix A.  If UPLO = 'U', only the upper trapezium is accessed; if UPLO = 'L', only the lower trapezium is accessed.

- LDA (input) INTEGER

  The leading dimension of the array A.  LDA \>= max(1,M).

- B (output) COMPLEX array, dimension (LDB,N)

  On exit, B = A in the locations specified by UPLO.

- LDB (input) INTEGER

  The leading dimension of the array B.  LDB \>= max(1,M).