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

SPTTRS(3F)							    SPTTRS(3F)

### NAME[Toc][Back]

SPTTRS - solve a system of	linear equations A * X = B with	a symmetric
positive definite tridiagonal matrix A using the factorization A =
L*D*L**T or A = U**T*D*U computed by SPTTRF

### SYNOPSIS[Toc][Back]

SUBROUTINE	SPTTRS(	N, NRHS, D, E, B, LDB, INFO )

INTEGER	INFO, LDB, N, NRHS

REAL		B( LDB,	* ), D(	* ), E(	* )

### PURPOSE[Toc][Back]

SPTTRS solves a system of linear equations	A * X =	B with a symmetric
positive definite tridiagonal matrix A using the factorization A =
L*D*L**T or A = U**T*D*U computed by SPTTRF.  (The	two forms are
equivalent	if A is	real.)

### ARGUMENTS[Toc][Back]

N	     (input) INTEGER
The order of the tridiagonal 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.

D	     (input) REAL array, dimension (N)
The n diagonal elements of	the diagonal matrix D from the
factorization computed by SPTTRF.

E	     (input) REAL array, dimension (N-1)
The (n-1) off-diagonal elements of	the unit bidiagonal factor U
or	L from the factorization computed by SPTTRF.

B	     (input/output) REAL 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
SPTTRS(3F)							    SPTTRS(3F)

### NAME[Toc][Back]

SPTTRS - solve a system of	linear equations A * X = B with	a symmetric
positive definite tridiagonal matrix A using the factorization A =
L*D*L**T or A = U**T*D*U computed by SPTTRF

### SYNOPSIS[Toc][Back]

SUBROUTINE	SPTTRS(	N, NRHS, D, E, B, LDB, INFO )

INTEGER	INFO, LDB, N, NRHS

REAL		B( LDB,	* ), D(	* ), E(	* )

### PURPOSE[Toc][Back]

SPTTRS solves a system of linear equations	A * X =	B with a symmetric
positive definite tridiagonal matrix A using the factorization A =
L*D*L**T or A = U**T*D*U computed by SPTTRF.  (The	two forms are
equivalent	if A is	real.)

### ARGUMENTS[Toc][Back]

N	     (input) INTEGER
The order of the tridiagonal 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.

D	     (input) REAL array, dimension (N)
The n diagonal elements of	the diagonal matrix D from the
factorization computed by SPTTRF.

E	     (input) REAL array, dimension (N-1)
The (n-1) off-diagonal elements of	the unit bidiagonal factor U
or	L from the factorization computed by SPTTRF.

B	     (input/output) REAL 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

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