I have a gekko model that is not producing the solution I expect. It would be great to print the model in a readable form for debugging purposes (much like printing an LP format from CPLEX).
Is this possible?
My model solves perfectly in Matlab.
1 Answers
Use m.open_folder() to open the run directory where gk0_model.apm is located. This is a text version of the model that Gekko produces. Here is a simple application:
from gekko import GEKKO
m = GEKKO() # create GEKKO model
print('--------- Follow local path to view files --------------')
print(m.path) # show source file path
m.open_folder()
print('-'*56)
u = m.Param(value=5,name='u') # define parameter
x = m.Var(name='s') # define variable
m.Equation(x==u) # define equation
m.options.SOLVER = 1 # change solver (1=APOPT,3=IPOPT)
m.solve(disp=False)
print('x: ' + str(x.value)) # print variable value
The following output is produced by the script:
--------- Follow local path to view files --------------
C:\Users\johnh\AppData\Local\Temp\tmp3oqof67rgk_model0
--------------------------------------------------------
x: [5.0]
Opening gk0_model.apm with a text editor shows the model file in APMonitor format:
Model
Parameters
u = 5
End Parameters
Variables
s = 0
End Variables
Equations
s=u
End Equations
End Model
The APM model can be solved with APM Matlab or through a web-browser interface.
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