GAMS World Forum

Hello,

I am trying to read some parameters from excel to gams. I am creating the gdx. file with this command:

$call gdxxrw.exe Book1.xls par=alpha rng=sheet1!A2:B3 ;

And then I am trying to load the data with:

$gdxin Book1.gdx
$load alpha
$gdxin

As you can see in the attachment the error I am taking says that there is no such file and it is true. Why there is no Book1.gdx file? Can anybody help me please..

Hi,

Never call an external program without checking the return code:
In your case gdxxrw fails and gives the message "Unknown option =" (from your screenshot). Not clear I understand why that is giving your description of the gdxxrw command. The only thing that looks suspicious is the tailing semicolon ';' at the end of the $call gdxxrw line. GAMS statements are terminated by ';' $call is a compile directive (also called dollar control option, https://www.gams.com/latest/docs/UG_Dol ... DOLLARcall) to call an external program at compile time, not a GAMS statement (https://www.gams.com/latest/docs/UG_GAM ... Statements). If removing the ';' does not help, post your spreadsheet and the part of your GAMS code that does the Excel reading.

-Michael

Hello,
I am learning to code in GAMS. I recently came across an issue while linking a gdxrrw file with the code, it is returning this error(placed in attachments along with the corresponding code). I can provide additional information if this is insufficient. Please help me to debug this error. Awaiting a reply.
Thank you in advance.

The error is: The code which produced the error:

I need use a input file with parameters. Is there some syntax that I can put the parameters in a simple file .txt?