jacobian.py writes "jac_out.gdx" when called as follows:

    jacobian.py gamsSysDir [jacFile] [dictFile]

gamsSysDir: Path to the GAMS system directory.

jacFile: gdx-file that contains a coefficient matrix with Symbol name "A".
If not specified, the program tries to open "jacobian.gdx" in the current directory.

dictFile: txt-file that contains the dictionary-informations.
If not specified, the program tries to open "dict.txt" in the current directory.
The file is searched for the key-words "Equations" and "Variables".


Example 1) trnsport:

    jacobian.py "C:\Program Files\GAMS23.6" jacobian.gdx dict.txt



Example 2) batchdesoa:

This example implements a simple Outer Approximation Scheme. The
linearization is done using the Convert option 'Jacobian' and a
Python script to transform the scalar structure of the Convert
jacobian.gdx into an index version
    
    gams batchdesoa