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

```
CPPTRS(3F)							    CPPTRS(3F)

```

### NAME[Toc][Back]

```     CPPTRS - solve a system of	linear equations A*X = B with a	Hermitian
positive definite matrix A	in packed storage using	the Cholesky
factorization A = U**H*U or A = L*L**H computed by	CPPTRF
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	CPPTRS(	UPLO, N, NRHS, AP, B, LDB, INFO	)

CHARACTER	UPLO

INTEGER	INFO, LDB, N, NRHS

COMPLEX	AP( * ), B( LDB, * )
```

### PURPOSE[Toc][Back]

```     CPPTRS solves a system of linear equations	A*X = B	with a Hermitian
positive definite matrix A	in packed storage using	the Cholesky
factorization A = U**H*U or A = L*L**H computed by	CPPTRF.

```

### 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.

AP	     (input) COMPLEX array, dimension (N*(N+1)/2)
The triangular factor U or	L from the Cholesky factorization A =
U**H*U or A = L*L**H, packed columnwise in	a linear array.	 The
j-th column of U or L is stored in	the array AP as	follows:  if
UPLO = 'U', AP(i +	(j-1)*j/2) = U(i,j) for	1<=i<=j; if UPLO =
'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

B	     (input/output) COMPLEX 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
CPPTRS(3F)							    CPPTRS(3F)

```

### NAME[Toc][Back]

```     CPPTRS - solve a system of	linear equations A*X = B with a	Hermitian
positive definite matrix A	in packed storage using	the Cholesky
factorization A = U**H*U or A = L*L**H computed by	CPPTRF
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	CPPTRS(	UPLO, N, NRHS, AP, B, LDB, INFO	)

CHARACTER	UPLO

INTEGER	INFO, LDB, N, NRHS

COMPLEX	AP( * ), B( LDB, * )
```

### PURPOSE[Toc][Back]

```     CPPTRS solves a system of linear equations	A*X = B	with a Hermitian
positive definite matrix A	in packed storage using	the Cholesky
factorization A = U**H*U or A = L*L**H computed by	CPPTRF.

```

### 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.

AP	     (input) COMPLEX array, dimension (N*(N+1)/2)
The triangular factor U or	L from the Cholesky factorization A =
U**H*U or A = L*L**H, packed columnwise in	a linear array.	 The
j-th column of U or L is stored in	the array AP as	follows:  if
UPLO = 'U', AP(i +	(j-1)*j/2) = U(i,j) for	1<=i<=j; if UPLO =
'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

B	     (input/output) COMPLEX 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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