The EIGENVEC function computes the eigenvectors of an n by n real, non-symmetric array using Inverse Subspace Iteration. The result is a complex array with a column dimension equal to n and a row dimension equal to the number of eigenvalues. Use ELMHES and HQR to find the eigenvalues of an n by n real, nonsymmetric array.
This routine is
written in the IDL language. Its source code can be found in the file
subdirectory of the IDL distribution.
Use this keyword to specify a named variable that will contain the residuals for each eigenvalue/eigenvector ( l / x ) pair. The residual is based on the definition A x - l x = 0 and is an array of the same size and type as that returned by the function. The rows of this array correspond to the residuals for each eigenvalue/eigenvector pair.