$Title Transportation Problem $Ontext In this example GAMS runs only in the background. We use the vba version of the GDX API to write a GDX file from data defined in the spreadsheet. With the option object API we set several GAMS options from vba and solve the model using the gams executable. At the end the solution is written into the workbook using the GDX vba API again. $Offtext $callTool win32.msappavail Excel $if errorlevel 1 $abort.noError "No Excel available" $call "start transport.xlsm"