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1<title>RG</title>
2<h2>SUBROUTINE RG(NM,N,A,WR,WI,MATZ,Z,IV1,FV1,IERR)</h2>
3 
4RG calls the recommended sequence of EISPACK subroutines to
5find the eigenvalues and, if desired, the eigenvectors of a
6real, general matrix.
7<p>
8<dl>
9<p><dt><b>NM</b>     
10<dd>Input, INTEGER NM, the row dimension (first dimension) of the two
11       dimensional arrays as declared in the calling program.
12 
13<p><dt><b>N</b>     
14<dd>Input, INTEGER N, the order (=size=number of rows=number of columns)
15       of the matrix whose eigenvalues are sought.
16 
17<p><dt><b>A</b>     
18<dd>Input/output, REAL A(NM,N), on input, the matrix, which is overwritten
19       on output.
20 
21<p><dt><b>WR</b>     
22<dd>Output, REAL WR(N), the real parts of the eigenvalues.
23 
24<p><dt><b>WI</b>     
25<dd>Output, REAL WI(N), the imaginary parts of the eigenvalues.
26 
27<p><dt><b>MATZ</b>   
28<dd>Input, INTEGER MATZ, set to 0 if only eigenvalues are desired.
29       Otherwise all eigenvectors will also be calculated.
30 
31<p><dt><b>Z</b>     
32<dd>Output, REAL Z(NM,N), if MATZ is not zero, Z contains the
33       eigenvectors of A.  If the J-th eigenvalue is real, the
34       J-th column of Z is its eigenvector.  If the J-th
35       eigenvalue is complex with positive real part (then the
36       J+1-th eigenvalue is its complex conjugate), its eigenvector
37       has real part in the J-th column of Z and imaginary part
38       in the J+1-th column of Z.
39 
40<p><dt><b>IV1</b>   
41<dd>Work vector, INTEGER IV1(N).
42 
43<p><dt><b>FV1</b>   
44<dd>Work vector, REAL FV1(N).
45 
46<p><dt><b>IERR</b>   
47<dd>Output, INTEGER IERR, an error flag.  0 if no errors, or
48       J if eigenvalues 1 through J were not found.
49</dl>
50<p>
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59<font size=-1>
60<i><a href=/copyright.html>&#169;</a> Pittsburgh Supercomputing Center (PSC)<br>
61Revised: October 1996 <br>
62</i></font>
63<font size=-2>
64<i>URL: http://www.psc.edu/general/software/packages/eispack/subroutines/rg.html</i>
65</font>
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