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('--------------------------------------------------------')

# test application
u = m.FV(value=5,name='u')  # define fixed value
x = m.SV(name='state')      # define state variable
m.Equation(x==u)            # define equation
m.options.COLDSTART = 1     # coldstart option
m.options.DIAGLEVEL = 0     # diagnostic level (0-10)
m.options.MAX_ITER = 500    # adjust maximum iterations
m.options.SENSITIVITY = 1   # sensitivity analysis
m.options.SOLVER = 1        # change solver (1=APOPT,3=IPOPT)
m.solve(disp=True)
print('x: ' + str(x.value)) # print variable value