Author Topic: dimension too large error?  (Read 6564 times)

sazabi

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dimension too large error?
« on: May 04, 2010, 05:20:57 PM »
Greetings,

I am doing a calculation of Ti cluster, and when I used RICC2 on excited state energies, the following error was reported


 dimension of red. space became too large.
  try internal restart...


After several of that, the calculation died. Can anyone please give some suggestions?

Thanks a lot!

---RICC2 OUTPUT FOR EXCITED STATE---
**************************************************************
 *                                                            *
 *    OPTIMIZATION OF THE EXCITED STATE CLUSTER AMPLITUDES    *
 *                                                            *
 **************************************************************


  preoptimize excitation energies/vectors using CCS:

  ==================================================


 ======== LINEAR CC RESPONSE SOLVER ========

    threshold for convergence:0.10E-02
    maximum number of simultaneous jacoby matrix transformations: 30

    Iter  #Vectors  time (min)    max. residual
    --------------------------------------------

     summary of start vectors generation:
     -------------------------------------------
     type of solution vectors      : RE0
     symmetry                      : a
     number of vectors requested   :    30
     number of vectors generated   :    30
       -- restarted from file      :     0
       -- from root homing vectors :     0
       -- supplied by input        :     0
       -- guessed as rhs/(e_a-e_i) :    30
     skipped because of zero norm  :     0
     skipped because of linear dep.:     0
     -------------------------------------------

      1      30        12.43     0.92E-01  (  3)    0.00E+00
      2      30         7.43     0.83E-01  ( 21)    0.75E-29
  dimension of red. space became too large.
  try internal restart...
      3      30        12.32     0.12E+00  ( 28)    0.32E-28

     summary of start vectors generation:
     -------------------------------------------
     type of solution vectors      : RE0
     symmetry                      : a
     number of vectors requested   :    30
     number of vectors generated   :    30
       -- restarted from file      :    30
       -- from root homing vectors :     0
       -- supplied by input        :     0
       -- guessed as rhs/(e_a-e_i) :     0
     skipped because of zero norm  :     0
     skipped because of linear dep.:     0
     -------------------------------------------

      4      30        11.42     0.12E+00  ( 28)    0.27E-29
      5      30        12.60     0.78E-01  ( 30)    0.77E-28
  dimension of red. space became too large.
  try internal restart...
      6      30        12.82     0.58E-01  ( 29)    0.27E-27

     summary of start vectors generation:
     -------------------------------------------
     type of solution vectors      : RE0
     symmetry                      : a
     number of vectors requested   :    30
     number of vectors generated   :    30
       -- restarted from file      :    30
       -- from root homing vectors :     0
       -- supplied by input        :     0
       -- guessed as rhs/(e_a-e_i) :     0
     skipped because of zero norm  :     0
     skipped because of linear dep.:     0
     -------------------------------------------

      7      30        12.33     0.58E-01  ( 29)    0.26E-29
      8      30         7.81     0.25E-01  ( 30)    0.31E-27
  dimension of red. space became too large.
  try internal restart...
      9      30        11.91     0.23E-01  ( 29)    0.17E-26

     summary of start vectors generation:
     -------------------------------------------
     type of solution vectors      : RE0
     symmetry                      : a
     number of vectors requested   :    30
     number of vectors generated   :    30
       -- restarted from file      :    30
       -- from root homing vectors :     0
       -- supplied by input        :     0
       -- guessed as rhs/(e_a-e_i) :     0
     skipped because of zero norm  :     0
     skipped because of linear dep.:     0
     -------------------------------------------

     10      30        11.57     0.23E-01  ( 29)    0.33E-29
     11      25        10.65     0.18E-01  ( 29)    0.14E-26
     12      20         8.70     0.22E-01  ( 27)    0.46E-26
  dimension of red. space became too large.
  try internal restart...
     13      18         8.62     0.21E-01  ( 26)    0.13E-25

     summary of start vectors generation:
     -------------------------------------------
     type of solution vectors      : RE0
     symmetry                      : a
     number of vectors requested   :    30
     number of vectors generated   :    30
       -- restarted from file      :    30
       -- from root homing vectors :     0
       -- supplied by input        :     0
       -- guessed as rhs/(e_a-e_i) :     0
     skipped because of zero norm  :     0
     skipped because of linear dep.:     0
     -------------------------------------------

     14      30         9.23     0.21E-01  ( 26)    0.35E-29
     15      18         5.83     0.16E-01  ( 26)    0.51E-26
     16      18         7.24     0.64E-02  ( 26)    0.18E-25
     17      12         4.75     0.40E-02  ( 26)    0.30E-25
  dimension of red. space became too large.
  try internal restart...
     18      12         4.47     0.58E-02  ( 26)    0.54E-25

     summary of start vectors generation:
     -------------------------------------------
     type of solution vectors      : RE0
     symmetry                      : a
     number of vectors requested   :    30
     number of vectors generated   :    30
       -- restarted from file      :    30
       -- from root homing vectors :     0
       -- supplied by input        :     0
       -- guessed as rhs/(e_a-e_i) :     0
     skipped because of zero norm  :     0
     skipped because of linear dep.:     0
     -------------------------------------------

     19      30        11.78     0.58E-02  ( 26)    0.38E-29
     20      12         5.50     0.37E-02  ( 26)    0.14E-25
     21      10         4.31     0.40E-02  ( 26)    0.36E-25
     22      10         4.20     0.42E-02  ( 26)    0.79E-25
     23       9         4.03     0.40E-02  ( 30)    0.11E-24
     24       7         3.48     0.35E-02  ( 30)    0.11E-24
     25       4         1.65     0.19E-02  ( 30)    0.12E-24

Arnim

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Re: dimension too large error?
« Reply #1 on: May 08, 2010, 12:15:21 PM »
Hi,

you could change the dimension of the reduced space with 'maxred'. Also, increasing the number of iteration could be necessary for you example.
The data group could look like this e.g.:
$ricc2
cc2
maxred = 1000
maxiter = 50

Cheers,
Arnim

sazabi

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Re: dimension too large error?
« Reply #2 on: May 09, 2010, 07:26:11 PM »
Thank you!