The listing will look something like:. If sigma is None, M is positive definite If sigma is specified, M is positive semi-definite. The command soft can be used to manipulate the environment from the command line. Describe listed modules The -h option to module will list all available commands.
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The input matrix is never given explicitly. The second argument is extra. Always supply TRUE here if it is, since it can speed up the computation. See details below. The function supplied in the fun argument is expected to perform this product.
If the product can be done efficiently, e. The options argument specifies what kind of calculation to perform. The dimension of the eigenproblem. You only need to set this if you call arpack directly. Possible values for symmetric input matrices: "LA" Compute nev largest algebraic eigenvalues. When nev is odd, compute one more from the high end than from the low end. Possible values for non-symmetric input matrices: "LM" Compute nev eigenvalues of largest magnitude.
This parameter is sometimes overwritten by the various functions, e. The number of eigenvalues to be computed. Stopping criterion: the relative accuracy of the Ritz value is considered acceptable if its error is less than tol times its estimated value.
If this is set to zero then machine precision is used. It should be set to zero in the current implementation. If zero then the shifts are provided by the user via reverse communication. Please always set this to one. Please always leave this on the default value, one. Cayley transformed mode. Possible values if the input matrix is not symmetric: 1.
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The input matrix is never given explicitly. The second argument is extra. Always supply TRUE here if it is, since it can speed up the computation. See details below. Format An object of class list of length The package is designed to compute a few eigenvalues and corresponding eigenvectors of a general n by n matrix A.
ARPACK DOCUMENTATION PDF