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## Matlab Error With Arpack Routine Dnaupd Info

## Error With Arpack Routine Dneupd

## c ===> shift-and-invert mode (in real arithmetic) c If OP*x = amu*x, then c amu = 1/2 * [ 1/(lambda-sigma) + 1/(lambda-conjg(sigma)) ].

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c **c\Remarks c** 1. Join the conversation Toggle Main Navigation Log In Products Solutions Academia Support Community Events Contact Us How To Buy Contact Us How To Buy Log In Products Solutions Academia Support Community 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. Close × Select Your Country Choose your country to get translated content where available and see local events and offers. http://idearage.com/error-with/error-with-arpack-routine-dneupd.php

c = -11: **IPARAM(7) = 1 and** BMAT = 'G' are incompatable. If many problems of c the same type are to be solved, one should experiment with increasing c NCV while keeping NEV fixed for a given test problem. c = -4: The maximum number of Arnoldi update iteration c must be greater than zero. United States Patents Trademarks Privacy Policy Preventing Piracy Terms of Use © 1994-2016 The MathWorks, Inc. https://www.mathworks.com/matlabcentral/newsreader/view_thread/262324

c c IPARAM(4) = NB: blocksize to be used in the recurrence. Control is c then given back to the calling routine which has the c responsibility to carry out the requested operation and call c dnaupd with the result. As you can see, if it does not converge, it gives an error and stops all the experiment, loosing by that hours and hours of simulations. IDO must be zero on the first c call to znaupd.

I could probably be circumvented easily with the aforementioned loop-like design. Discover... Most of the cost in generating each Arnoldi vector is c in the matrix-vector operation OP*x. At least, sometimes.More often than not I get back the error below.

This way you can easily keep track of topics that you're interested in. United States Patents Trademarks Privacy Policy Preventing Piracy Terms of Use © 1994-2016 The MathWorks, Inc. The computed Ritz values are approximate eigenvalues of OP. https://www.mathworks.com/matlabcentral/answers/112264-error-using-eigs-error-with-arpack-routine-dnaupd c ------------------------------------------------------------- c c WORKD Double precision work array of length 3*N. (REVERSE COMMUNICATION) c Distributed array to be used in the basic Arnoldi iteration c for reverse communication.

Related Content Join the 15-year community celebration. However, as lambda goes to infinity, c the operator OP in mode 4 dampens the eigenvalues more strongly than c does OP defined in mode 3. Tags are public and visible to everyone. IPARAM(5) c returns the number of wanted converged Ritz values.

c 'LR' -> want the NEV eigenvalues of largest real part. check here The optimal "cross-over" with respect to CPU time c is problem dependent and must be determined empirically. Matlab Error With Arpack Routine Dnaupd Info c If INFO .NE. 0, RESID contains the initial residual vector, c possibly from a previous run. Matlab Eigs Log In to answer or comment on this question.

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Download now × About Newsgroups, Newsreaders, and MATLAB Central What are newsgroups? c 'SI' -> want the NEV eigenvalues of smallest imaginary part. c See Data Distribution Note below. This is new starting with release 2 of ARPACK.

c The shifts selected at each iteration are used to filter out c the components of the unwanted eigenvector. Based on your location, we recommend that you select: . c = -9999: Could not build an Arnoldi factorization.

TOL*ABS(RITZ(I)) c where ABS(RITZ(I)) is the magnitude when RITZ(I) is complex. c IPNTR(14): pointer to the NP shifts in WORKL. c c RESID Double precision array of length N. (INPUT/OUTPUT) c On INPUT: c If INFO .EQ. 0, a random initial residual vector is used. You can also select a location from the following list: Americas Canada (English) United States (English) Europe Belgium (English) Denmark (English) Deutschland (Deutsch) España (Español) Finland (English) France (Français) Ireland (English)

c 'SR' -> want the NEV eigenvalues of smallest real part. Bruno Subject: Error with ARPACK routine when using eigs From: Cezary Cezary (view profile) 1 post Date: 28 Sep, 2012 14:40:08 Message: 3 of 3 Reply to this message Add author Play games and win prizes! c c IPARAM(4) = NB: blocksize to be used in the recurrence.

See Remark 2 below. When operating in Mode = 3 setting WHICH = 'LM' will c compute the NEV eigenvalues of the original problem that are c closest to the shift SIGMA . The only formal requirement is that NCV > NEV + 2. c c\Remarks c 1.

Please c check actual array dimensions and layout. Close × Select Your Country Choose your country to get translated content where available and see local events and offers. Apply Today MATLAB Academy New to MATLAB? You can also select a location from the following list: Americas Canada (English) United States (English) Europe Belgium (English) Denmark (English) Deutschland (Deutsch) España (Español) Finland (English) France (Français) Ireland (English)

c = -8: Error return from LAPACK eigenvalue calculation; c = -9: Starting vector is zero. Error in ==> eigs at 369 flag = processEUPDinfo(nargin<3); 0 Comments Show all comments Tags processeupdinfolrarpack Products MATLAB Related Content 1 Answer MathWorks Support Team (view profile) 13,637 questions 13,637 answers c c 5. c If INFO .NE. 0, RESID contains the initial residual vector, c possibly from a previous run.

The newsgroups are a worldwide forum that is open to everyone. If a basis for the invariant subspace corresponding to the converged Ritz c values is needed, the user must call dneupd immediately following c completion of dnaupd. c IDO = 2: compute Y = B * X where c IPNTR(1) is the pointer into WORKD for X, c IPNTR(2) is the pointer into WORKD for Y.

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