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

```
DTRSL(3F)							     DTRSL(3F)

```

### NAME[Toc][Back]

```     DTRSL   - DTRSL solves systems of the form

T * X =	B or
TRANS(T) * X = B

where T is	a triangular matrix of order N.	 Here TRANS(T) denotes the
transpose of the matrix T.

```

### SYNOPSYS[Toc][Back]

```      SUBROUTINE DTRSL(T,LDT,N,B,JOB,INFO)
```

### DESCRIPTION[Toc][Back]

```     On	Entry

T DOUBLE PRECISION(LDT,N)
T contains the matrix of the system.  The zero
elements of the	matrix are not referenced, and
the corresponding elements of the array	can be
used to	store other information.

LDT INTEGER
LDT is the leading dimension of	the array T.

N INTEGER
N is the order of the system.

B DOUBLE PRECISION(N).
B contains the right hand side of the system.

JOB INTEGER
JOB specifies what kind	of system is to	be solved.
If JOB is
00   solve T*X=B, T lower triangular,
01   solve T*X=B, T upper triangular,
10   solve TRANS(T)*X=B, T lower triangular,
11   solve TRANS(T)*X=B, T upper triangular.  On Return

B B contains the solution,	if INFO	.EQ. 0.
Otherwise B is unaltered.

INFO INTEGER
INFO contains zero if the system is nonsingular.
Otherwise INFO contains	the index of
the first zero diagonal	element	of T.  LINPACK.	 This version dated
08/14/78 .	 G. W. Stewart,	University of Maryland,	Argonne	National Lab.
Subroutines and Functions BLAS DAXPY,DDOT Fortran MOD

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