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Question about the conditional statement ('m.if3') in the GEKKO

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问题 I would like to add some conditional statements in the GEKKO code. I added the below statement with 'm.if3'. However, it has returned syntax error that I didn't have without the conditional statement. 'R1_1 = m.if3(R1<0, 0, R1)' #%% GEKKO m = GEKKO(remote=False) #print(m.version) #m.time = np.linspace(0, 3600, 100) m.time = np.array([0,tstep]) cH = m.CV(value=cs0[0]) cM = m.CV(value=cs0[1]) cW = m.CV(value=cs0[2]) cF = m.CV(value=cs0[3]) R1_1 = m.Var() r3 = m.Intermediate(r0*(1-cF/cFeMax)**(1

GEKKO - optimization in matrix form

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问题 I am trying to solve an optimization problem where I need to specify the problem and the constraints using a 2D matrix. I have been using SCIPY, where the 1D arrays are the requirements. I want to check if GEKKO allows one to specify the objective function, bounds and constraints using a 2D matrix. I have provided details and a reproducible version of the problem in the post here: SCIPY - building constraints without listing each variable separately Thanks C 回答1: You can use the m.Array

GEKKO RTO vs MPC MODES

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问题 This is a question derived from this one. After posting my question I found a solution (more like a patch to force the optimizer to optimize). There is something that baffles me. John Hedengren correctly points out that a b=1.0 in the ODE leads to an infeasible solution with IMODE=6 . However in my patchy work around with IMODE=3 I do get a solution. I'm trying to understand what's happening here reading GEKKO's documentation for IMODE=3 and 6 but it is not clear to me IMODE=3 RTO Real-Time

Variable bounds in MPC with GEKKO

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问题 I'm trying to implement a thermostat control using MPC and GEKKO. The state variable (temperature) should be within a lower and upper pre-specified temp values , temp_low and temp_upper in the code below. Both bound vary along the day: one value per hour. The objective function is the cost-to-go of using the heating. The price also changes along the day, TOU below. T_external is the room's exterior temperature that plays a role in the differential equation. How can implement this so that it

How do you implement a Python Gekko application for real time systems? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 months ago . I want to connect a Python Gekko application to a real-time system. For each "cycle" of the controller there are three steps: current values are read from the measurement devices the Python application creates a new move plan based on the measurements and a predictive model the move plan is re-inserted into the

How to define time-dependent, discrete parameter?

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问题 Recently, I have built a small model with GEKKO. It contains a Parameter which actually changes with time. How can I implement that? I tried using if3 , but it gives an error. Here's the MWE: #!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Started on 10-08-2019 @author: rotton """ import numpy as np import matplotlib.pyplot as plt from gekko import GEKKO #Initialize Model m = GEKKO(remote=False) # Parameters k_1 = m.Param(value = 0.19) f_1 = m.Param(value = 29.0) V_liq = m.Param(value =

How to define time-dependent, discrete parameter?

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Recently, I have built a small model with GEKKO. It contains a Parameter which actually changes with time. How can I implement that? I tried using if3 , but it gives an error. Here's the MWE: #!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Started on 10-08-2019 @author: rotton """ import numpy as np import matplotlib.pyplot as plt from gekko import GEKKO #Initialize Model m = GEKKO(remote=False) # Parameters k_1 = m.Param(value = 0.19) f_1 = m.Param(value = 29.0) V_liq = m.Param(value = 159.0) q_in = m.Param(value = 2.5) X_in = m.Param(value = 271.77) Y_in = m.Param(value = 164.34) X = m

How to check if python package is latest version programmatically?

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问题 How do you check if a package is at its latest version programmatically in a script and return a true or false? I can check with a script like this: package='gekko' import pip if hasattr(pip, 'main'): from pip import main as pipmain else: from pip._internal import main as pipmain pipmain(['search','gekko']) or with command line: (base) C:\User>pip search gekko gekko (0.2.3) - Machine learning and optimization for dynamic systems INSTALLED: 0.2.3 (latest) But how do I check programmatically