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use $ for assigning conditions.

Hi, You mean it should work for t1 till t4 ? In this case you can use ord to restrict it. anywhere in the formula that you wanna use that variable you will use ord to eliminate it. WaterFlow(t)$(ord(t)>=2 and ord(t)<=5).. pumpFlow(t) =E= 5.5586*x_pump(t) + 0.2278; limitSolar(t)$(ord(t)>=2 and ord(t)...

Dear Bussieck,

I guessed so. Thank you very much for your reply.

Regards,
Arman

Dear all,

I have a free variable that I do not want it to accept the value of zero. How can I fix this variable?

Regards,
Arman