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|
C****************************************************
C **** RDMPS1 ... READ THE MPS FILE ****
C****************************************************
SUBROUTINE rdmps1(RCODE,buffer,MAXM,MAXN,MAXNZA,
X M,N,NZA,IROBJ,BIG,DLOBND,DUPBND,
X NAMEC,NAMEB,NAMRAN,NAMBND,NAMMPS,inmps,
X RWNAME,CLNAME,STAVAR,RWSTAT,
X HDRWCD,LNKRW,HDCLCD,LNKCL,
X RWNMBS,CLPNTS,IROW,
X ACOEFF,RHSB,RANGES,
X UPBND,LOBND,RELT)
C
C *** PARAMETERS
INTEGER*4 RCODE,MAXM,MAXN,MAXNZA,M,N,NZA,IROBJ
DOUBLE PRECISION BIG,DLOBND,DUPBND
CHARACTER*(*) NAMEC,NAMEB,NAMRAN,NAMBND,NAMMPS
CHARACTER*(*) BUFFER
CHARACTER*8 RWNAME(MAXM),CLNAME(MAXN)
INTEGER*4 STAVAR(*),RWSTAT(*),RWNMBS(*)
INTEGER*4 HDRWCD(*),LNKRW(*)
INTEGER*4 HDCLCD(*),LNKCL(*)
INTEGER*4 CLPNTS(*),IROW(*)
DOUBLE PRECISION ACOEFF(*),RHSB(*),RANGES(*)
DOUBLE PRECISION UPBND(*),LOBND(*),RELT(*)
C
C
C
C *** PARAMETERS DESCRIPTION
C RCODE Return code:
C 0 Everything OK;
C 21 Number of constraints exceeds MAXM.
C 22 Number of variables exceeds MAXN.
C 23 Number of nonzeros exceeds MAXNZA.
C 83 Error in MPS file (in RHSB or RANGES).
C 84 Error in MPS file (in ROWS, COLUMNS or BOUNDS).
C 86 Unable to open the MPS file.
C MAXM Maximum number of constraints.
C MAXN Maximum number of variables.
C MAXNZA Maximum number of nonzeros of the LP constraint matrix.
C M Current number of constraints.
C N Current number of variables.
C NZA Current number of nonzeros of the LP constraint matrix.
C IROBJ Index of the objective row.
C BIG "Big" number.
C DUPBND Default UPPER bound.
C DLOBND Default LOWER bound.
C NAMEC Name of the objective row.
C NAMEB Name of the right hand side section.
C NAMRAN Name of the ranges section.
C NAMBND Name of the bounds section.
C NAMMPS Name of the LP problem.
C FILMPS Name of the MPS input file.
C RWNAME Array of row names.
C CLNAME Array of column names.
C STAVAR Work array for (local) variable status.
C RWSTAT Array of row types:
C 1 row type is = ;
C 2 row type is >= ;
C 3 row type is <= ;
C 4 objective row;
C 5 other free row.
C HDRWCD Header to the linked list of rows with the same codes.
C LNKRW Linked list of rows with the same codes.
C HDCLCD Header to the linked list of columns with the same codes.
C LNKCL Linked list of columns with the same codes.
C RWNMBS Row numbers of nonzeros in columns of matrix A.
C CLPNTS Pointers to the beginning of columns of matrix A.
C IROW Integer work array.
C ACOEFF Array of nonzero elements for each column.
C RHSB Right hand side of the linear program.
C RANGES Array of constraint ranges.
C UPBND Array of upper bounds.
C LOBND Array of lower bounds.
C RELT Real work array.
C
C
C
C *** LOCAL VARIABLES
INTEGER*4 LINE,I,INMPS,J,COLLEN,INDEX,IPOS,STATUS,NSTRCT,KCODE
INTEGER*4 IMPSOK
DOUBLE PRECISION SMALLA,VAL1,VAL2
CHARACTER*8 NAME0,NAMRW1,NAMRW2,NAMCLN
CHARACTER*2 TYPROW,BNDTYP
CHARACTER*4 NM
CHARACTER*100 RDLINE
CHARACTER SECT
C
C
C
C *** PURPOSE
C This routine reads the MPS input file.
C
C *** SUBROUTINES CALLED
C LKINDX,RDRHS,LKCODE
C
C *** NOTES
C
C
C *** REFERENCES:
C Altman A., Gondzio J. (1993). An efficient implementation of
C a higher order primal-dual interior point method for large
C sparse linear programs, Archives of Control Sciences 2,
C No 1-2, pp. 23-40.
C Altman A., Gondzio J. (1993). HOPDM - A higher order primal-
C dual method for large scale linear programmming, European
C Journal of Operational Research 66 (1993) pp 158-160.
C Gondzio J., Tachat D. (1994). The design and application of
C IPMLO - a FORTRAN library for linear optimization with
C interior point methods, RAIRO Recherche Operationnelle 28,
C No 1, pp. 37-56.
C Murtagh B. (1981). Advanced Linear Programming, McGrew-Hill,
C New York, 1981.
C Murtagh B., Saunders M. (1983). MINOS 5.0 User's guide,
C Technical Report SOL 83-20, Department of Operations Research,
C Stanford University, Stanford, 1983.
C
C *** HISTORY:
C Written by: Jacek Gondzio, Systems Research Institute,
C Polish Academy of Sciences, Newelska 6,
C 01-447 Warsaw, Poland.
C Date written: November 15, 1992
C Last modified: February 8, 1997
C
C
C *** BODY OF (RDMPS1) ***
C
SMALLA=1.0D-10
C
C Format used to read every line of the MPS file.
1000 FORMAT(A80)
C
C
C Initialize.
M=0
LINE=0
IROBJ=-1
C
DO 20 I=1,MAXM
RWNAME(I)=' '
RWSTAT(I)=0
20 CONTINUE
C
C Initialize linked lists of rows/cols with the same codes.
DO 40 I=1,MAXM
HDRWCD(I)=0
LNKRW(I)=0
40 CONTINUE
DO 50 J=1,MAXN
HDCLCD(J)=0
LNKCL(J)=0
50 CONTINUE
C
C
C
C Read the problem name.
60 LINE=LINE+1
READ(INMPS,1000,END=9000) RDLINE
IF(RDLINE(1:1).EQ.'*') GO TO 60
READ(RDLINE,61,ERR=9000) NM,NAMMPS
61 FORMAT(A4,10X,A8)
IF(NM.NE.'NAME'.AND.NM.NE.'name') GO TO 60
70 LINE=LINE+1
READ(INMPS,1000,END=9000) RDLINE
IF(RDLINE(1:1).EQ.'*') GO TO 70
READ(RDLINE,71,ERR=9000) SECT
71 FORMAT(A1)
IF(SECT.NE.'R'.AND.SECT.NE.'r') GO TO 9000
C
C
C
C
C Read the ROWS section.
100 LINE=LINE+1
READ(INMPS,1000,END=9000) RDLINE
IF(RDLINE(1:1).EQ.'*') GO TO 100
READ(RDLINE,101,ERR=9000) SECT,TYPROW,NAMRW1
101 FORMAT(A1,A2,1X,A8)
IF(SECT.NE.' ') GO TO 200
C
C Here if a constraint has been found. Determine its type.
C Check if there is enough space for a new row.
M=M+1
css IF(M.GE.MAXM) GO TO 9010
IF(M.GT.MAXM) GO TO 9010
C
IF(TYPROW.EQ.' E'.OR.TYPROW.EQ.'E '.OR.
X TYPROW.EQ.' e'.OR.TYPROW.EQ.'e ') THEN
RWSTAT(M)=1
GO TO 120
ENDIF
C
IF(TYPROW.EQ.' G'.OR.TYPROW.EQ.'G '.OR.
X TYPROW.EQ.' g'.OR.TYPROW.EQ.'g ') THEN
RWSTAT(M)=2
GO TO 120
ENDIF
C
IF(TYPROW.EQ.' L'.OR.TYPROW.EQ.'L '.OR.
X TYPROW.EQ.' l'.OR.TYPROW.EQ.'l ') THEN
RWSTAT(M)=3
GO TO 120
ENDIF
C
IF(TYPROW.EQ.' N'.OR.TYPROW.EQ.'N '.OR.
X TYPROW.EQ.' n'.OR.TYPROW.EQ.'n ') THEN
IF(NAMRW1.EQ.NAMEC(1:8)) THEN
C
C Save index of the objective row.
IROBJ=M
RWSTAT(M)=4
ELSE
RWSTAT(M)=5
C
C The first free row is a default objective.
IF(NAMEC(1:8).EQ.' ') THEN
IROBJ=M
RWSTAT(M)=4
NAMEC(1:8)=NAMRW1
ENDIF
ENDIF
GO TO 120
ENDIF
C
C Invalid row type.
GO TO 9050
C
C Here to save the row name.
120 RWNAME(M)=NAMRW1
C
C Continue reading of the ROWS section.
GO TO 100
C
C
C
C
C
C
C Read COLUMNS section.
200 CONTINUE
INDEX=1
C
C ENCODE all row names and create linked lists of rows
C with the same codes.
IMPSOK=1
DO 210 I=1,M
CALL MYCODE(IOLOG,RWNAME(I),KCODE,M)
LNKRW(I)=HDRWCD(KCODE)
HDRWCD(KCODE)=I
C
C Check for multiple row definition (February 10, 1996).
C Scan all rows with the same code.
IPOS=LNKRW(I)
205 IF(IPOS.EQ.0) GO TO 210
IF(RWNAME(IPOS).EQ.RWNAME(I)) THEN
WRITE(BUFFER,206) RWNAME(IPOS)
206 FORMAT(1X,'RDMPS1 error: Row ',A8,'repeated.')
C CALL basout(io,wte,BUFFER)
IMPSOK=0
GO TO 210
ENDIF
IPOS=LNKRW(IPOS)
GO TO 205
210 CONTINUE
IF(IMPSOK.EQ.0) GO TO 9400
C
IF(SECT.NE.'C'.AND.SECT.NE.'c') GO TO 9000
NAME0=' '
220 LINE=LINE+1
READ(INMPS,1000,END=9000) RDLINE
IF(RDLINE(1:1).EQ.'*') GO TO 220
READ(RDLINE,221,ERR=9000) SECT,NAMCLN,NAMRW1,VAL1,NAMRW2,VAL2
221 FORMAT(A1,3X,A8,2X,A8,2X,D12.0,3X,A8,2X,D12.0)
C
IF(NAMCLN.EQ.NAME0) GO TO 260
C
C Here if the new column has been found.
C Save the previous column in the LP data structures.
C
C Check if this is the first column.
IF(NAME0.EQ.' ') THEN
NAME0=NAMCLN
COLLEN=0
NZA=0
N=1
GO TO 260
ENDIF
C
IF(NZA+COLLEN.GT.MAXNZA) GO TO 9020
C
CLPNTS(N)=NZA+1
CLNAME(N)=NAME0
DO 240 I=1,COLLEN
IPOS=NZA+I
RWNMBS(IPOS)=IROW(I)
ACOEFF(IPOS)=RELT(I)
240 CONTINUE
NZA=NZA+COLLEN
C
C Check if there are still columns to be read.
IF(SECT.NE.' ') THEN
CLPNTS(N+1)=NZA+1
NSTRCT=N
GO TO 300
ELSE
C
C Initialize the new column.
N=N+1
css IF(N.GE.MAXN) GO TO 9030
IF(N.GT.MAXN) GO TO 9030
NAME0=NAMCLN
COLLEN=0
GO TO 260
ENDIF
C
C
C Find the position of the nonzero element.
C 260 CALL LKINDX(RWNAME,M,NAMRW1,INDEX)
260 CALL LKCODE(RWNAME,M,NAMRW1,INDEX,HDRWCD,LNKRW,IOLOG)
IF(INDEX.EQ.0) GO TO 9040
C
C
C Save nonzero element of the N-th column.
IF(DABS(VAL1).LE.SMALLA) GO TO 280
COLLEN=COLLEN+1
IROW(COLLEN)=INDEX
RELT(COLLEN)=VAL1
C
C Check if there is another nonzero read in the analysed line.
280 IF(NAMRW2.NE.' ') THEN
NAMRW1=NAMRW2
VAL1=VAL2
NAMRW2=' '
GO TO 260
ELSE
GO TO 220
ENDIF
C
C
C
C
C Initialize RHSB and RANGES arrays.
300 DO 320 I=1,MAXM
RHSB(I)=0.0
RANGES(I)=BIG
320 CONTINUE
C
C
C
C Set the default bounds for all structural variables.
DO 520 J=1,MAXN
STAVAR(J)=0
LOBND(J)=DLOBND
UPBND(J)=DUPBND
520 CONTINUE
C
C
C
C
C
C
C Read the RHSB section.
C
IF(SECT.NE.'R'.AND.SECT.NE.'r') GO TO 9000
CALL RDRHS(RCODE,BUFFER,MAXM,M,LINE,
X HDRWCD,LNKRW,HDCLCD,LNKCL,
X NAMEB,RHSB,RWNAME,SECT,INMPS,IOLOG)
C
IF(RCODE.GT.0) GO TO 6000
C
C
C
C
C Check if there is a RANGES section to be read.
IF(SECT.NE.'R'.AND.SECT.NE.'r') GO TO 400
C
C
C
C
C
C
C Read the RANGES section.
C
CALL RDRHS(RCODE,BUFFER,MAXM,M,LINE,
X HDRWCD,LNKRW,HDCLCD,LNKCL,
X NAMRAN,RANGES,RWNAME,SECT,INMPS,IOLOG)
C
IF(RCODE.GT.0) GO TO 6000
C
C
C
400 CONTINUE
IF(SECT.NE.'B'.AND.SECT.NE.'b') GO TO 600
C
C
C
C
C
C
C Read the BOUNDS section.
C
INDEX=1
550 LINE=LINE+1
READ(INMPS,1000,END=9000) RDLINE
IF(RDLINE(1:1).EQ.'*') GO TO 550
C
C ENCODE all column names and create linked lists of columns
C with the same codes.
C DO 560 J=1,N
C LNKCL(J)=HDCLCD(KCODE)
C HDCLCD(KCODE)=J
C 560 CONTINUE
C
READ(RDLINE,561,ERR=9000) SECT,BNDTYP,NAME0,NAMCLN,VAL1
561 FORMAT(A1,A2,1X,A8,2X,A8,2X,D12.0)
C
IF(SECT.NE.' ') GO TO 600
C
C First record met defines default section name.
IF(NAMBND(1:8).EQ.' ') THEN
NAMBND(1:8)=NAME0
ENDIF
C
C Ignore the record that define unimportant bound.
IF(NAME0.NE.NAMBND(1:8)) GO TO 550
C
C Determine index of the variable to which the bound refers.
CALL LKINDX(CLNAME,N,NAMCLN,INDEX)
C CALL LKCODE(CLNAME,N,NAMCLN,INDEX,HDCLCD,LNKCL,IOLOG)
IF(INDEX.EQ.0) GO TO 9060
C
C
C Here to detect the type of the bound read.
STATUS=STAVAR(INDEX)
C
C
C
IF(BNDTYP.EQ.'UP'.OR.BNDTYP.EQ.'up') THEN
C
C Here when an UPPER bound is being defined.
C Accept multiple definition of the UPPER bound.
C The last definition is valid.
IF(STATUS.EQ.6) GO TO 9070
IF(STATUS.EQ.-1) GO TO 9080
C
IF(STATUS.EQ.0.OR.STATUS.EQ.1) THEN
C
C Not yet bounded variable (or multiple UPPER bound).
UPBND(INDEX)=VAL1
STAVAR(INDEX)=1
GO TO 550
ENDIF
C
IF(STATUS.EQ.2.OR.STATUS.EQ.3) THEN
C
C Already LOWER bounded variable.
UPBND(INDEX)=VAL1
STAVAR(INDEX)=3
GO TO 550
ENDIF
C
ENDIF
C
C
C
IF(BNDTYP.EQ.'LO'.OR.BNDTYP.EQ.'lo') THEN
C
C Here when a LOWER bound is being defined.
IF(STATUS.EQ.2.OR.STATUS.EQ.3.OR.STATUS.EQ.6) GO TO 9070
IF(STATUS.EQ.-1) GO TO 9080
C
IF(STATUS.EQ.0) THEN
C
C Not yet bounded variable.
LOBND(INDEX)=VAL1
STAVAR(INDEX)=2
GO TO 550
ENDIF
C
IF(STATUS.EQ.1) THEN
C
C Already UPPER bounded variable.
LOBND(INDEX)=VAL1
STAVAR(INDEX)=3
GO TO 550
ENDIF
C
ENDIF
C
C
C
IF(BNDTYP.EQ.'FR'.OR.BNDTYP.EQ.'fr') THEN
C
C Here when a FREE variable is being defined.
IF(STATUS.GT.0) GO TO 9090
C
C Not yet bounded variable.
LOBND(INDEX)=-BIG
UPBND(INDEX)=BIG
STAVAR(INDEX)=-1
GO TO 550
C
ENDIF
C
C
C
IF(BNDTYP.EQ.'FX'.OR.BNDTYP.EQ.'fx') THEN
C
C Here when a FIXED variable is being defined.
IF(STATUS.EQ.-1) GO TO 9080
IF(STATUS.NE.0) GO TO 9100
C
C Not yet bounded variable.
LOBND(INDEX)=VAL1
UPBND(INDEX)=VAL1
STAVAR(INDEX)=6
GO TO 550
C
ENDIF
C
C
C
IF(BNDTYP.EQ.'PL'.OR.BNDTYP.EQ.'pl') THEN
C
C Here when a PLUS INFINITY bound is being defined.
IF(STATUS.EQ.-1) GO TO 9080
IF(STATUS.NE.0) GO TO 9070
C
C Not yet bounded variable.
C LOBND(INDEX)=VAL1
UPBND(INDEX)=BIG
STAVAR(INDEX)=2
GO TO 550
C
ENDIF
C
C
C
IF(BNDTYP.EQ.'MI'.OR.BNDTYP.EQ.'mi') THEN
C
C Here when a MINUS INFINITY bound is being defined.
IF(STATUS.EQ.-1) GO TO 9080
IF(STATUS.NE.0) GO TO 9070
C
C Not yet bounded variable.
LOBND(INDEX)=-BIG
C UPBND(INDEX)=VAL1
STAVAR(INDEX)=1
GO TO 550
C
ENDIF
C
GO TO 9110
C
C
C
600 CONTINUE
IF(SECT.NE.'E'.AND.SECT.NE.'e') GO TO 9000
C
C
C
C
C
C
C The ENDATA card has been found.
C
IF(IROBJ.EQ.-1) GO TO 9130
5000 CONTINUE
RCODE=0
C
6000 CONTINUE
C Close the MPS input file.
css call clunit(-inmps,filmps(1:ilen),mode)
c CLOSE(INMPS)
RETURN
C
C
C
C
C
C Here when error occurs.
9000 WRITE(BUFFER,9001) LINE
9001 FORMAT(1X,'RDMPS1: Error while reading line',I10,
X ' of the MPS file.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9010 WRITE(BUFFER,9011)
9011 FORMAT(1X,'RDMPS1 ERROR: Number of constraints',
X ' in the MPS file exceeds MAXM.')
css CALL basout(io,wte,BUFFER)
RCODE=21
GO TO 6000
C
9020 WRITE(BUFFER,9021)
9021 FORMAT(1X,'RDMPS1 ERROR: Number of nonzeros',
X ' of matrix A exceeds MAXNZA.')
css CALL basout(io,wte,BUFFER)
RCODE=23
GO TO 6000
C
9030 WRITE(BUFFER,9031)
9031 FORMAT(1X,'RDMPS1 ERROR: Number of variables',
X ' in the MPS file exceeds MAXN.')
css CALL basout(io,wte,BUFFER)
RCODE=22
GO TO 6000
C
9040 WRITE(BUFFER,9041) LINE
9041 FORMAT(1X,'RDMPS1 ERROR: Unknown row found',
X ' at line',I10,' of the MPS file.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9050 WRITE(BUFFER,9051) TYPROW,LINE
9051 FORMAT(1X,'RDMPS1 ERROR: Unknown row type=',A2,
X ' at line',I10,' of the MPS file.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9060 WRITE(BUFFER,9061) LINE
9061 FORMAT(1X,'RDMPS1 ERROR: Unknown column found',
X ' at line',I10,' of the MPS file.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9070 WRITE(BUFFER,9071) LINE,BNDTYP
9071 FORMAT(1X,'RDMPS1 ERROR: Line',I10,' in MPS file',
X ' defines ',A2,' bound')
css CALL basout(io,wte,BUFFER)
WRITE(BUFFER,9072) NAMCLN
9072 FORMAT(14X,'for variable ',A8,
X ' that has already been bounded.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9080 WRITE(BUFFER,9081) LINE,BNDTYP
9081 FORMAT(1X,'RDMPS1 ERROR: Line',I10,' in MPS file',
X ' defines ',A2,' bound')
CALL basout(io,wte,BUFFER)
WRITE(BUFFER,9082) NAMCLN
9082 FORMAT(14X,'for variable ',A8,
X ' that has earlier been declared FREE.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9090 WRITE(BUFFER,9091) LINE
9091 FORMAT(1X,'RDMPS1 ERROR: Line',I10,' in MPS file',
X ' declares as FREE')
css CALL basout(io,wte,BUFFER)
WRITE(BUFFER,9092) NAMCLN
9092 FORMAT(14X,' variable ',A8,
X ' that has earlier been bounded.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9100 WRITE(BUFFER,9101) LINE,NAMCLN
9101 FORMAT(1X,'RDMPS1 ERROR: Line',I10,' in MPS file',
X ' declares as FIXED',14X,' variable ',A8,
X ' that has earlier been bounded.')
css CALL basout(io,wte,BUFFER)
css WRITE(BUFFER,9102) NAMCLN
css 9102 FORMAT(14X,' variable ',A8,
css X ' that has earlier been bounded.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9110 WRITE(BUFFER,9111) LINE,BNDTYP
9111 FORMAT(1X,'RDMPS1 ERROR: Line',I10,' in MPS file',
X ' has invalid bound type ',A2)
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9130 WRITE(BUFFER,9131) NAMEC(1:8)
9131 FORMAT(1X,'RDMPS1 ERROR: Objective row =',A8,
X ' has no entries.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C
9400 WRITE(BUFFER,9401)
9401 FORMAT(1X,'RDMPS1 ERROR: Multiple row definition.')
css CALL basout(io,wte,BUFFER)
RCODE=84
GO TO 6000
C *** LAST CARD OF (RDMPS1) ***
END
C******************************************************************
SUBROUTINE LKCODE(RWNAME,M,NAME,INDEX,HEADER,LINKS,IOLOG)
C
INTEGER*4 KCODE,M,I,INDEX,IOLOG
INTEGER*4 HEADER(M),LINKS(M)
CHARACTER*8 RWNAME(M),NAME
CHARACTER*100 BUFFER
C
C Get code of the NAME.
CALL MYCODE(IOLOG,NAME,KCODE,M)
INDEX=HEADER(KCODE)
C
C Determine the index such that RWNAME(index) = NAME.
DO 100 I=1,M
IF(INDEX.EQ.0) GO TO 200
IF(RWNAME(INDEX).EQ.NAME) GO TO 200
INDEX=LINKS(INDEX)
100 CONTINUE
C
200 CONTINUE
RETURN
END
C*******************************************************************
SUBROUTINE LKINDX(RWNAME,M,NAME,INDEX)
C
INTEGER*4 M,I,INDEX,INDEX2
CHARACTER*8 RWNAME(M),NAME
C
INDEX2=INDEX
C WRITE(0,10) INDEX
C 10 FORMAT(1X,' old index=',I5)
INDEX=0
DO 100 I=INDEX2,M
IF(RWNAME(I).EQ.NAME) THEN
INDEX=I
GO TO 200
ENDIF
100 CONTINUE
DO 150 I=1,INDEX2
IF(RWNAME(I).EQ.NAME) THEN
INDEX=I
GO TO 200
ENDIF
150 CONTINUE
C
200 CONTINUE
RETURN
END
C********************************************************************
C ******* RDRHS ... READ THE RHS SECTION OF THE MPS FILE *******
C********************************************************************
C
SUBROUTINE RDRHS(RCODE,BUFFER,MAXM,M,LINE,
X HDRWCD,LNKRW,HDCLCD,LNKCL,
X NAMEB,RRHS,RWNAME,SECT,INMPS,IOLOG)
C
C
include '../stack.h'
C
C *** PARAMETERS
INTEGER*4 RCODE,MAXM,M,LINE,INMPS,IOLOG
CHARACTER*8 NAMEB,RWNAME(MAXM)
INTEGER*4 HDRWCD(M+1),LNKRW(M+1)
INTEGER*4 HDCLCD(M+1),LNKCL(M+1)
DOUBLE PRECISION RRHS(MAXM)
CHARACTER*100 BUFFER
CHARACTER SECT
C
C
C
C *** LOCAL VARIABLES
INTEGER*4 INDEX
DOUBLE PRECISION VAL1,VAL2
CHARACTER*8 NAME0,NAMRW1,NAMRW2
CHARACTER*100 RDLINE
C
C
C
C *** PARAMETERS DESCRIPTION
C ON INPUT:
C MAXM Maximum number of constraints.
C M Current number of constraints.
C LINE Current number of the line read from the MPS file.
C NAMEB The name of the right hand side section chosen.
C RWNAME Array of row names.
C HDRWCD Header to the linked list of rows with the same codes.
C LNKRW Linked list of rows with the same codes.
C HDCLCD Header to the linked list of columns with the same codes.
C LNKCL Linked list of columns with the same codes.
C IOLOG Output unit number where log messages are to be written.
C INMPS Input unit number where the input MPS file is read from.
C
C ON OUTPUT:
C RCODE Return code:
C 0 Everything OK;
C 83 Error in MPS file (in RRHS or RANGES section).
C RRHS The right hand side vector.
C SECT Indicator of the section that follows RRHS one.
C
C
C
C *** SUBROUTINES CALLED
C LKINDX
C
C
C
C *** PURPOSE
C This routine reads the RRHS section of the MPS file.
C (It can also be used to read the RANGES section).
C
C
C
C *** NOTES
C
C
C
C *** REFERENCES:
C Altman A., Gondzio J. (1993). An efficient implementation of
C a higher order primal-dual interior point method for large
C sparse linear programs, Archives of Control Sciences 2,
C No 1-2, pp. 23-40.
C Altman A., Gondzio J. (1993). HOPDM - A higher order primal-
C dual method for large scale linear programmming, European
C Journal of Operational Research 66 (1993) pp 158-160.
C Gondzio J., Tachat D. (1994). The design and application of
C IPMLO - a FORTRAN library for linear optimization with
C interior point methods, RAIRO Recherche Operationnelle 28,
C No 1, pp. 37-56.
C
C
C
C *** HISTORY:
C Written by: Jacek Gondzio, Systems Research Institute,
C Polish Academy of Sciences, Newelska 6,
C 01-447 Warsaw, Poland.
C Last modified: February 8, 1997
C
C
C
C *** BODY OF (RDRHS) ***
C
C Format used to read every line of the MPS file.
1000 FORMAT(A80)
C
C
C
C
C Main loop begins here.
200 LINE=LINE+1
READ(INMPS,1000,ERR=9000) RDLINE
IF(RDLINE(1:1).EQ.'*') GO TO 200
INDEX=1
READ(RDLINE,201,ERR=9000) SECT,NAME0,NAMRW1,VAL1,NAMRW2,VAL2
201 FORMAT(A1,3X,A8,2X,A8,2X,D12.0,3X,A8,2X,D12.0)
C
C Check if the line belongs to the same section.
IF(SECT.NE.' ') GO TO 300
C
C First record met defines default section name.
IF(NAMEB.EQ.' ') THEN
NAMEB=NAME0
ENDIF
IF(NAME0.NE.NAMEB) GO TO 9000
C
C
C Find the position of the nonzero element.
C 250 CALL LKINDX(RWNAME,M,NAMRW1,INDEX)
250 CALL LKCODE(RWNAME,M,NAMRW1,INDEX,HDRWCD,LNKRW,IOLOG)
IF(INDEX.EQ.0) GO TO 9010
C
C Save the RRHS coefficient.
RRHS(INDEX)=VAL1
C WRITE(BUFFER,251) INDEX,RWNAME(INDEX),VAL1
C 251 FORMAT(1X,'RDRHS: rw=',I6,' rwname=',A8,' elt=',D14.6)
C CALL MYWRT(IOLOG,BUFFER)
C
C Check if there is another nonzero read in the analysed line.
IF(NAMRW2.NE.' ') THEN
NAMRW1=NAMRW2
VAL1=VAL2
NAMRW2=' '
GO TO 250
ELSE
GO TO 200
ENDIF
C
C
C
300 CONTINUE
RCODE=0
C
6000 CONTINUE
RETURN
C
C
C
C Here if an error occurs.
9000 WRITE(BUFFER,9001) LINE
9001 FORMAT(1X,'RDRHS ERROR: Unexpected characters found',
X ' at line',I10,' of the MPS file.')
css CALL basout(io,wte,BUFFER)
RCODE=83
GO TO 6000
C
9010 WRITE(BUFFER,9011) LINE
9011 FORMAT(1X,'RDRHS ERROR: Unknown row was found',
X ' at line',I10,' of the MPS file.')
css CALL basout(io,wte,BUFFER)
RCODE=83
GO TO 6000
C
C
C
C *** LAST CARD OF (RDRHS) ***
END
C*******************************************************************
C ** MYCODE ... ENCODE THE 8-CHARACTER NAME INTO AN INTEGER **
C*******************************************************************
C
SUBROUTINE MYCODE(IOLOG,NAME,KCODE,M)
C
C
C *** PARAMETERS
CHARACTER*9 NAME
INTEGER*4 IOLOG,KCODE,M
C
C
C *** LOCAL VARIABLES
INTEGER*4 IPOS
CHARACTER*100 BUFFER
C
C
C *** PARAMETERS DESCRIPTION
C NAME 8-character name (row or column name).
C KCODE Integer code associated to the name.
C M The number of rows (or columns) in matrix A.
C IOLOG Output unit number where log messages are to be written.
C
C *** HISTORY:
C Written by: Jacek Gondzio, Systems Research Institute,
C Polish Academy of Sciences, Newelska 6,
C 01-447 Warsaw, Poland.
C Date written: October 14, 1994
C Last modified: May 17, 1995
C
C
C *** BODY OF (MYCODE) ***
C
C
KCODE=0
DO 100 IPOS=1,8
KCODE=KCODE+ICHAR(NAME(IPOS:IPOS))*IPOS
C WRITE(BUFFER,101) IPOS,NAME(IPOS:IPOS)
C 101 FORMAT(1X,'ipos=',I2,' char=',A1)
C CALL MYWRT(IOLOG,BUFFER)
100 CONTINUE
KCODE=MOD(KCODE,M)+1
C WRITE(BUFFER,102) NAME,KCODE
C 102 FORMAT(1X,' name=',A8,' has a code=',I6)
C CALL MYWRT(IOLOG,BUFFER)
RETURN
C
C
C *** LAST CARD OF (MYCODE) ***
END
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