SGESL(3F)							     SGESL(3F)

NAME    [Toc]    [Back]

     SGESL   - SGESL solves the	real system A *	X = B  or  TRANS(A) * X	= B
     using the factors computed	by SGECO or SGEFA.

SYNOPSYS    [Toc]    [Back]

      SUBROUTINE SGESL(A,LDA,N,IPVT,B,JOB)

DESCRIPTION    [Toc]    [Back]

     On	Entry

     A REAL(LDA, N)
	the output from	SGECO or SGEFA.

     LDA INTEGER
	the leading dimension of the array  A .

     N INTEGER
	the order of the matrix	 A .

     IPVT INTEGER(N)
	the pivot vector from SGECO or SGEFA.

     B REAL(N)
	the right hand side vector.

     JOB INTEGER
	= 0	    to solve  A*X = B ,
	= nonzero   to solve  TRANS(A)*X = B  where
	TRANS(A)  is the transpose.  On	Return

     B the solution vector  X .	Error Condition

     A division	by zero	will occur if the input	factor contains	a zero on the
     diagonal.	Technically, this indicates singularity, but it	is often
     caused by improper	arguments or improper setting of LDA .	It will	not
     occur if the subroutines are called correctly and if SGECO	has set	RCOND
     .GT. 0.0 or SGEFA has set INFO .EQ. 0 .  To compute  INVERSE(A) * C
     where  C  is a matrix with	 P  columns
	CALL SGECO(A,LDA,N,IPVT,RCOND,Z)
	IF (RCOND is too small)	GO TO ...
	DO 10 J	= 1, P
	CALL SGESL(A,LDA,N,IPVT,C(1,J),0) 10 CONTINUE LINPACK.	This version
     dated 08/14/78 .  Cleve Moler, University of New Mexico, Argonne National
     Lab.  Subroutines and Functions BLAS SAXPY,SDOT


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