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## Matlab Error With Arpack Routine Dnaupd Info

## Error With Arpack Routine Dneupd

## c 'SI' -> want the NEV eigenvalues of smallest imaginary part.

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Without knowing the properties of **your matrix, it's** hard to make precise diagnostic (still difficult even if we would know the matrix). c = 0: Normal exit. The only formal requirement is that NCV > NEV + 2. Thank you! http://sandon.org/error-with/error-with-arpack-routine-dneupd.php

c IPNTR(5): pointer to the NCV by NCV upper Hessenberg matrix c H in WORKL. For instance, I would like to know, out of the k eigenvalue-eigenvector pairs, which one did not converge? Previous by thread: an additional question about using callbacks Next by thread: Re: Why do I get an error when I use eigs? c Eigenvalues of the current upper Hessenberg matrix are located in c WORKL(IPNTR(6)) through WORKL(IPNTR(6)+NCV-1).

c c WORKL Double precision work array of length LWORKL. (OUTPUT/WORKSPACE) c Private (replicated) array on each PE or array allocated on c the front end. Discover... At least, sometimes.More often than not I get back the error below. c = 2: No longer an informational error.

c c INFO Integer. **(INPUT/OUTPUT) c** If INFO .EQ. 0, a randomly initial residual vector is used. MATLAB Central is hosted by MathWorks. NCV must satisfy the two c inequalities 2 <= NCV-NEV and NCV <= N. Apply Today MATLAB Academy New to MATLAB?

c c NCV Integer. (INPUT) c Number of columns of the matrix V. Error With Arpack Routine Dneupd Thanks!The matrix A is a real symmetric matrix in my code, though sometimes it might be singular. 0 Comments Show all comments Tags eigs Products No products are associated with this Apply Today MATLAB Academy New to MATLAB? this c c IPARAM(6) = IUPD c No longer referenced.

c c IPNTR Integer array of length 14. (OUTPUT) c Pointer to mark the starting locations in the WORKD and WORKL c arrays for matrices/vectors used by the Arnoldi iteration. Error using ==> eigs>processEUPDinfo Error with ARPACK routine dneupd: dnaupd did not find any eigenvalues to sufficient accuracy. This is **new starting with release** 2 of ARPACK. c IPNTR(4): pointer to the next available location in WORKL c that is untouched by the program.

You can add tags, authors, threads, and even search results to your watch list. c 'SR' -> want the NEV eigenvalues of smallest real part. Matlab Error With Arpack Routine Dnaupd Info c c BMAT Character*1. (INPUT) c BMAT specifies the type of the matrix B that defines the c semi-inner product for the operator OP. Matlab Eigs One possibility c is to increase the size of NCV relative to NEV.

Deprecated starting c with release 2 of ARPACK. Control is c then given back to the calling routine which has the c responsibility to carry out the requested operation and call c znaupd with the result. Discover... An Error Occurred Unable to complete the action because of changes made to the page.

c c WHICH Character*2. (INPUT) c 'LM' -> want the NEV eigenvalues of largest magnitude. c IPNTR(7): pointer to the imaginary part of the ritz value array c RITZI in WORKL. c = -2: NEV must be positive. c If INFO .NE. 0, RESID contains the initial residual vector, c possibly from a previous run.

c = -9999: Could not build an Arnoldi factorization. See Remark 2 below. IDO must be zero on the first c call to znaupd.

c BMAT = 'I' -> standard eigenvalue problem A*x = lambda*x c BMAT = 'G' -> generalized eigenvalue problem A*x = lambda*M*x c c N Integer. (INPUT) c Dimension of the c See Chapter 8 of Reference 2 for further information. c IPNTR(13): pointer to the NCV by NCV matrix of eigenvectors c of the upper Hessenberg matrix H. Close × Select Your Country Choose your country to get translated content where available and see local events and offers.

c 'SM' -> want the NEV eigenvalues of smallest magnitude. Learn more MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi Learn more Discover what MATLABĀ® can do for your career. B*OP = (OP')*B, then subroutine ssaupd should be used instead. Discover...

This is equivalent to c restarting the iteration with a starting vector c that is a linear combination of approximate Schur c vectors associated with the "wanted" Ritz values. Play games and win prizes! After convergence, approximate eigenvalues c of the original problem may be obtained with the ARPACK subroutine zneupd. It works for k=3000 but not for k=4000 or k=2500.Error using eigs (line ###)Error with ARPACK routine znaupd: info = -8Going through the documentation of the znaupd routine ( http://www.caam.rice.edu/software/ARPACK/UG/node138.html ),

Spam Control Most newsgroup spam is filtered out by the MATLAB Central Newsreader. c NOTE: 2 <= NCV-NEV in order that complex conjugate pairs of Ritz c values are kept together. (See remark 4 below) c c V Complex*16 array N by NCV. (OUTPUT) c . . Close × Select Your Country Choose your country to get translated content where available and see local events and offers.

Discussions are threaded, or grouped in a way that allows you to read a posted message and all of its replies in chronological order. c NOTE: 2 <= NCV-NEV in order that complex conjugate pairs of Ritz c values are kept together. (See remark 4 below) c c V Double precision array N by NCV. c c 3. c c\Remarks c 1.

c = -9999: Could not build an Arnoldi factorization. Appropriate triangular c linear systems should be solved with L and L' rather c than computing inverses.

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