apis/examples_python/special__values_8py_source.html

from gams import *

import sys

import math


def get_model():

    return '''

Scalar GUndef

       GNA    / NA    /

       GPInf  / +Inf  /

       GMInf  / -Inf  /

       GEps   / eps   /

       pythonUndef

       pythonNA

       pythonPInf

       pythonMInf

       pythonEps ;


$onUndf

$gdxIn %myDB%

$load pythonUndef pythonNA pythonPInf pythonMInf pythonEps

$gdxIn


GUndef = 1/0;

ExecError = 0;


abort$(GUndef <> pythonUndef) 'pythonUndef not as expected', GUndef, pythonUndef;

abort$(GNA    <> pythonNA   ) 'pythonNA    not as expected', GNA,    pythonNA;

abort$(GPInf  <> pythonPInf ) 'pythonPInf  not as expected', GPInf,  pythonPInf;

abort$(GMInf  <> pythonMInf ) 'pythonMInf  not as expected', GMInf,  pythonMInf;

abort$(GEps   <> pythonEps  ) 'pythonEps   not as expected', GEps,   pythonEps;'''


if __name__ == "__main__":

    try:

        if len(sys.argv) > 1:

            ws = GamsWorkspace(system_directory = sys.argv[1])

        else:

            ws = GamsWorkspace()


        dbIn = ws.add_database(in_model_name = "myDB")

        dbIn.add_parameter("pythonUndef", 0).add_record().value = SV_UNDEF

        dbIn.add_parameter("pythonNA", 0).add_record().value = float('nan')

        dbIn.add_parameter("pythonPInf", 0).add_record().value = float('inf')

        dbIn.add_parameter("pythonMInf", 0).add_record().value = float('-inf')

        dbIn.add_parameter("pythonEps", 0).add_record().value = SV_EPS


        gj = ws.add_job_from_string(get_model())


        gj.run(databases = dbIn)

        dbOut = gj.out_db


        GUndef = dbOut["GUndef"].first_record().value

        if GUndef != SV_UNDEF:

            raise Exception("GUndef not as expected: " + str(GUndef))

        GNA = dbOut["GNA"].first_record().value

        if not math.isnan(GNA):

            raise Exception("GNA not as expected: " + str(GNA))

        GPInf = dbOut["GPInf"].first_record().value

        if GPInf != float('inf'):

            raise Exception("GPInf not as expected: " + str(GPInf))

        GMInf = dbOut["GMInf"].first_record().value

        if GMInf != float('-inf'):

            raise Exception("GMInf not as expected: " + str(GMInf))

        GEps = dbOut["GEps"].first_record().value

        if GEps != SV_EPS:

            raise Exception("GEps not as expected: " + GEps);

    except Exception as e:

        raise Exception("\n###\n### Exception caught:" + str(e) + "\n###")