error 66 and 256

GAMS
1

Hi everyone,

I keep having error 66 and 256 consequently… I will appreciate your help. Thank you very much… In the model I need to minimize the maximum of something, you will see in the code below
Untitled_6.gms (1.76 KB)
error 66: The symbol shown has not been defined or assigned

2

Hi,

When you look into the lst file, you will find the following error message:

 66  solve data_envelopment  using lp minimizing M;
****                                               $66,256
****  66  The symbol shown has not been defined or assigned
****         A wild shot: You may have spurious commas in the explanatory
****         text of a declaration. Check symbol reference list.
**** 256  Error(s) in analyzing solve statement. More detail appears
****      Below the solve statement above
**** The following LP errors were detected in model data_envelopment:
****  66 equation normalization.. symbol "y" has no values assigned

Maybe you forgot to assign values to parameter y?

I hope this helps!

Fred

3

thank you very much Fred! :slight_smile: