Hi Mariano

This error you found is a bug in the software. The back calculation function is very old and I did not make the transition to the newer data management inside NESSY. I have fixed the issue now. As far as I can see are you working on Windows. The fixed version of NESSY is only included in the source code (svn development version) of NESSY. If you would like to access the newer version, you will have to install each Python package (and python) as described on http://home.gna.org/nessy/download.html. Then you will need to use subversion to access the development code (http://subversion.tigris.org/). Alternatively, you can download the source code of NESSY 12.3.1 and I can send you the patched file in another mail.

All the new fixes will be included in the next NESSY release, which won't be too soon.

Hope this helped.

Cheers,
Michael

Am 19.05.2012 04:11, schrieb Mariano Gonzalez:
Dear Michael,

I have three sets of experiments with the following delays (Hz):
1) 0 (reference 1)    66    100    166    266    400    600
2) 0 (reference 2)    33    133    200    333    766
3) 0 (reference 3)    33    966
I used the first data set as Data Experiment 1 and then when I tried to use the option "Back calculate Intensities":
Select new reference peak list: 0 (reference 2)
Select peak list: 33
I get the following error message and cannot obtain the ouput sparky-format 
file:
Execution Protocol......
NESSY error> Traceback (most recent call last):
NESSY error> File "C:\Users\michael\Python\pyinstaller-1.4\nessy\build\pyi.win32\nessy\outPYZ1.pyz/func.backcalc", line 176, in calc
NESSY error> TypeError
NESSY error> :
NESSY error> float() argument must be a string or a number
NESSY error>
the sparky-file is:
Assignment         w1         w2   Data Height
      V4N-H    122.113      8.207      7425034
      E5N-H    125.856      8.448      5615799
Thanks for your help.
Cheers
Mariano Gonzalez


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