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SUBROUTINE RG(NM,N,A,WR,WI,MATZ,Z,IV1,FV1,IERR)
C
INTEGER N,NM,IS1,IS2,IERR,MATZ
DOUBLE PRECISION A(NM,N),WR(N),WI(N),Z(NM,N),FV1(N)
INTEGER IV1(N)
C
C THIS SUBROUTINE CALLS THE RECOMMENDED SEQUENCE OF
C SUBROUTINES FROM THE EIGENSYSTEM SUBROUTINE PACKAGE (EISPACK)
C TO FIND THE EIGENVALUES AND EIGENVECTORS (IF DESIRED)
C OF A REAL GENERAL MATRIX.
C
C ON INPUT
C
C NM MUST BE SET TO THE ROW DIMENSION OF THE TWO-DIMENSIONAL
C ARRAY PARAMETERS AS DECLARED IN THE CALLING PROGRAM
C DIMENSION STATEMENT.
C
C N IS THE ORDER OF THE MATRIX A.
C
C A CONTAINS THE REAL GENERAL MATRIX.
C
C MATZ IS AN INTEGER VARIABLE SET EQUAL TO ZERO IF
C ONLY EIGENVALUES ARE DESIRED. OTHERWISE IT IS SET TO
C ANY NON-ZERO INTEGER FOR BOTH EIGENVALUES AND EIGENVECTORS.
C
C ON OUTPUT
C
C WR AND WI CONTAIN THE REAL AND IMAGINARY PARTS,
C RESPECTIVELY, OF THE EIGENVALUES. COMPLEX CONJUGATE
C PAIRS OF EIGENVALUES APPEAR CONSECUTIVELY WITH THE
C EIGENVALUE HAVING THE POSITIVE IMAGINARY PART FIRST.
C
C Z CONTAINS THE REAL AND IMAGINARY PARTS OF THE EIGENVECTORS
C IF MATZ IS NOT ZERO. IF THE J-TH EIGENVALUE IS REAL, THE
C J-TH COLUMN OF Z CONTAINS ITS EIGENVECTOR. IF THE J-TH
C EIGENVALUE IS COMPLEX WITH POSITIVE IMAGINARY PART, THE
C J-TH AND (J+1)-TH COLUMNS OF Z CONTAIN THE REAL AND
C IMAGINARY PARTS OF ITS EIGENVECTOR. THE CONJUGATE OF THIS
C VECTOR IS THE EIGENVECTOR FOR THE CONJUGATE EIGENVALUE.
C
C IERR IS AN INTEGER OUTPUT VARIABLE SET EQUAL TO AN ERROR
C COMPLETION CODE DESCRIBED IN THE DOCUMENTATION FOR HQR
C AND HQR2. THE NORMAL COMPLETION CODE IS ZERO.
C
C IV1 AND FV1 ARE TEMPORARY STORAGE ARRAYS.
C
C QUESTIONS AND COMMENTS SHOULD BE DIRECTED TO BURTON S. GARBOW,
C MATHEMATICS AND COMPUTER SCIENCE DIV, ARGONNE NATIONAL LABORATORY
C
C THIS VERSION DATED AUGUST 1983.
C
C ------------------------------------------------------------------
C