DTRSL man page on IRIX

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DTRSL(3F)							     DTRSL(3F)

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

DESCRIPTION
     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

									Page 1

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