embeddedcode: Python

GAMS
1

Hi,

I am trying to get the level values of my variable using embeddedcode: Python to do some transformation on them in Python and finally output a CSV file. I am running into an issue while doing gams.get(‘x.l’). There must be some other way to get the level values. Does anyone have any idea how to do this?
Thanks in advance

2

Hi,

With gams.get() in embedded code Python, you will get all values of a symbol - e.g. level, marginal, etc. for a GAMS variable and need to process them manually afterwards. Here is some code snippet that reads and prints a variable x:

embeddedCode Python:
var_x = list(gams.get('x'))
print(var_x)
endEmbeddedCode

For more information see the documentation for embedded Python code: https://www.gams.com/latest/docs/UG_EmbeddedCode.html?search=embedded%20code#UG_EmbeddedCode_Python

Depending on the transformations that you want to do, GAMS Connect might also be helpful for you:

embeddedCode Connect:
- GAMSReader:  # read variable x from GAMS into the Connect database
    symbols:
      - name: x
- Projection:  # turn variable x into parameter x_new with level values only
    name: x.l(i,j)
    newName: x_new(i,j)
    asParameter: True
- CSVWriter:  # write x_new to CSV
    file: x_level.csv
    name: x_new
endembeddedCode

For more information on GAMS Connect, see the documentation: https://www.gams.com/latest/docs/UG_GAMSCONNECT.html

Best,
Clemens