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Output mostly NaN

PostPosted: Thu Nov 04, 2010 4:57 pm
by wedgef5
I'm having a problem, where da_wrfvar runs to completion, but most of the output variables are all NaNs. I enabled print_detail for xa, xb and grad, and it appears to me that this is where problems begin...

Code: Select all
Starting outer iteration :   1
Starting cost function:  1.76504398D+03, Gradient=  NaN           
For this outer iteration gradient target is:        NaN           

It then goes through 200 iterations of the inner loop, all of which look like...

Code: Select all
Iter    Cost Function         Gradient             Step
  1      NaN                 NaN                 0.00000000D+00
  2      NaN                 NaN                 0.00000000D+00
  3      NaN                 NaN                 0.00000000D+00
  4      NaN                 NaN                 0.00000000D+00
  5      NaN                 NaN                 0.00000000D+00
  6      NaN                 NaN                 0.00000000D+00
  7      NaN                 NaN                 0.00000000D+00
  8      NaN                 NaN                 0.00000000D+00
  9      NaN                 NaN                 0.00000000D+00
 10      NaN                 NaN                 0.00000000D+00

It's frustrating, as I've run wrfvar successfully before.

Does anyone have any ideas as to what is going wrong here?


Re: Output mostly NaN

PostPosted: Tue Apr 05, 2011 3:43 pm
by hnlim
Hi Matt,

You did not provide enough information to allow for diagnosis.