| Line 214... |
Line 214... |
| 214 |
|
214 |
|
| 215 |
/**
|
215 |
/**
|
| 216 |
\name Find eigensolutions of a symmetric real matrix.
|
216 |
\name Find eigensolutions of a symmetric real matrix.
|
| 217 |
This function accepts a real symmetric matrix Q and a vector b.
|
217 |
This function accepts a real symmetric matrix Q and a vector b.
|
| 218 |
When the function returns, the eigenvalues of the matrix Q will be stored in b and
|
218 |
When the function returns, the eigenvalues of the matrix Q will be stored in b and
|
| 219 |
the eigenvectors form the columns of Q. This function is based on the
|
219 |
the eigenvectors form the rows of Q. This function is based on the
|
| 220 |
Lapack function dsyev, and returns its info code. A code of 0 indicates
|
220 |
Lapack function dsyev, and returns its info code. A code of 0 indicates
|
| 221 |
success, and a code < 0 indicates an error. Probably Q is not a real symmetric matrix.
|
221 |
success, and a code < 0 indicates an error. Probably Q is not a real symmetric matrix.
|
| 222 |
If the code is > 0 "the algorithm failed to converge; code off-diagonal elements
|
222 |
If the code is > 0 "the algorithm failed to converge; code off-diagonal elements
|
| 223 |
of an intermediate tridiagonal form did not converge to zero." Presumably this means that
|
223 |
of an intermediate tridiagonal form did not converge to zero." Presumably this means that
|
| 224 |
code contains the number of eigenvalues which are ok.
|
224 |
code contains the number of eigenvalues which are ok.
|