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man pages->IRIX man pages -> complib/dpotrs (3)
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### Contents

```
DPOTRS(3F)							    DPOTRS(3F)

```

### NAME[Toc][Back]

```     DPOTRS - solve a system of	linear equations A*X = B with a	symmetric
positive definite matrix A	using the Cholesky factorization A = U**T*U or
A = L*L**T	computed by DPOTRF
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	DPOTRS(	UPLO, N, NRHS, A, LDA, B, LDB, INFO )

CHARACTER	UPLO

INTEGER	INFO, LDA, LDB,	N, NRHS

DOUBLE		PRECISION A( LDA, * ), B( LDB, * )
```

### PURPOSE[Toc][Back]

```     DPOTRS solves a system of linear equations	A*X = B	with a symmetric
positive definite matrix A	using the Cholesky factorization A = U**T*U or
A = L*L**T	computed by DPOTRF.

```

### ARGUMENTS[Toc][Back]

```     UPLO    (input) CHARACTER*1
= 'U':  Upper triangle of A is stored;
= 'L':  Lower triangle of A is stored.

N	     (input) INTEGER
The order of the matrix A.	 N >= 0.

NRHS    (input) INTEGER
The number	of right hand sides, i.e., the number of columns of
the matrix	B.  NRHS >= 0.

A	     (input) DOUBLE PRECISION array, dimension (LDA,N)
The triangular factor U or	L from the Cholesky factorization A =
U**T*U or A = L*L**T, as computed by DPOTRF.

LDA     (input) INTEGER
The leading dimension of the array	A.  LDA	>= max(1,N).

B	     (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
On	entry, the right hand side matrix B.  On exit, the solution
matrix X.

LDB     (input) INTEGER
The leading dimension of the array	B.  LDB	>= max(1,N).

INFO    (output) INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value
DPOTRS(3F)							    DPOTRS(3F)

```

### NAME[Toc][Back]

```     DPOTRS - solve a system of	linear equations A*X = B with a	symmetric
positive definite matrix A	using the Cholesky factorization A = U**T*U or
A = L*L**T	computed by DPOTRF
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	DPOTRS(	UPLO, N, NRHS, A, LDA, B, LDB, INFO )

CHARACTER	UPLO

INTEGER	INFO, LDA, LDB,	N, NRHS

DOUBLE		PRECISION A( LDA, * ), B( LDB, * )
```

### PURPOSE[Toc][Back]

```     DPOTRS solves a system of linear equations	A*X = B	with a symmetric
positive definite matrix A	using the Cholesky factorization A = U**T*U or
A = L*L**T	computed by DPOTRF.

```

### ARGUMENTS[Toc][Back]

```     UPLO    (input) CHARACTER*1
= 'U':  Upper triangle of A is stored;
= 'L':  Lower triangle of A is stored.

N	     (input) INTEGER
The order of the matrix A.	 N >= 0.

NRHS    (input) INTEGER
The number	of right hand sides, i.e., the number of columns of
the matrix	B.  NRHS >= 0.

A	     (input) DOUBLE PRECISION array, dimension (LDA,N)
The triangular factor U or	L from the Cholesky factorization A =
U**T*U or A = L*L**T, as computed by DPOTRF.

LDA     (input) INTEGER
The leading dimension of the array	A.  LDA	>= max(1,N).

B	     (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
On	entry, the right hand side matrix B.  On exit, the solution
matrix X.

LDB     (input) INTEGER
The leading dimension of the array	B.  LDB	>= max(1,N).

INFO    (output) INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value

PPPPaaaaggggeeee 1111```
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