Python 如何将多次迭代的pyomo解决方案(仅包括参数、目标和变量)写入excel/csv文件?
我有一个pyomo模型和一个可变参数模型。通过for循环,模型能够迭代并找到最优解。但我不知道如何将包括参数值、目标、所有迭代的变量在内的解决方案写入excel/csv文件 这是for循环Python 如何将多次迭代的pyomo解决方案(仅包括参数、目标和变量)写入excel/csv文件?,python,pandas,pyomo,Python,Pandas,Pyomo,我有一个pyomo模型和一个可变参数模型。通过for循环,模型能够迭代并找到最优解。但我不知道如何将包括参数值、目标、所有迭代的变量在内的解决方案写入excel/csv文件 这是for循环 for RapeseedPrice in range(300, 600, 100): # change the value of parameter model.Prices model.Prices["rapeseed"] = RapeseedPrice print("When pr
for RapeseedPrice in range(300, 600, 100):
# change the value of parameter model.Prices
model.Prices["rapeseed"] = RapeseedPrice
print("When price of rapeseed = {}".format(RapeseedPrice))
opt = SolverFactory('ipopt')
opt.solve(model, tee = True)
results = opt.solve
model.display()
如果包括以下三个for循环,则可以访问所需的所有值:
for RapeseedPrice in range(300, 600, 100):
# change the value of parameter model.Prices
model.Prices["rapeseed"] = RapeseedPrice
print("When price of rapeseed = {}".format(RapeseedPrice))
opt = SolverFactory('ipopt')
opt.solve(model, tee = True)
results = opt.solve
model.display()
for parmobject in model.component_objects(Param, active=True):
nametoprint = str(str(parmobject.name))
print ("Parameter ", nametoprint) # doctest: +SKIP
for index in parmobject:
vtoprint = value(parmobject[index])
print (" ",index, vtoprint) # doctest: +SKIP
for o in model.component_data_objects(Objective, active=True):
print(o, value(o))
for v in model.component_data_objects(Var, active=True):
print(v, value(v))
我期望一个excel文件,它以列的形式显示不同的交互,以行的形式显示所有参数、目标和变量
it1 it2 it3
param 1
param 2
param 3
...
objective
var 1
var 2
var 3
...
类似的方法应该可以将您的值放入Pandas数据框中,并从中很容易输出到csv文件:
from pyomo.environ import *
import pandas as pd
m = ConcreteModel()
m.s = Set(initialize=[1,2,3])
m.p = Param(initialize=1, mutable=True)
m.x = Var(m.s, bounds=(1,3))
m.obj = Objective(expr=m.p*sum(m.x[k]**2 for k in m.s))
solver = SolverFactory('ipopt')
all_data={}
for j in range(1,4):
m.p = j
solver.solve(m)
data = {}
for i in m.component_data_objects(Param):
data[i.name] = value(i)
for i in m.component_data_objects(Var):
data[i.name] = value(i)
for i in m.component_data_objects(Objective):
data[i.name] = value(i)
all_data['Solve '+str(j)] = pd.Series(data)
df = pd.DataFrame(all_data)
让我回答我自己的问题 为此,我们需要进口:
import pandas as pd
import numpy as np
from copy import deepcopy
首先,您需要获取标题:
header0 = []
header1 = []
for parmobject in model.component_objects(Param, active=True):
nametoprint = str(str(parmobject.name))
for index in parmobject:
header0.append(nametoprint)
header1.append(index)
for o in model.component_data_objects(Objective, active=True):
header0.append("Objective")
header1.append(str(o.name))
for v in model.component_data_objects(Var, active=True):
header0.append("Variable")
header1.append(str(v.name))
MultiHeaders = [header0, header1]
其次,你必须获得价值观:
AllData = []
pov_data = []
for RapeseedPrice in range(100, 500, 100):
model.Prices['rapeseed'] = RapeseedPrice
# solve the model
opt.solve(model)
# access pov_dat
for parmobject in model.component_objects(Param, active=True):
for index in parmobject:
vtoprint = value(parmobject[index])
pov_data.append(vtoprint)
for o in model.component_data_objects(Objective, active=True):
pov_data.append(value(o))
for v in model.component_data_objects(Var, active=True):
pov_data.append(value(v))
AllData.append(deepcopy(pov_data))
pov_data.clear()
第三,将数据与标题合并到数据框中:
CDFarm_results = pd.DataFrame(data = np.array(AllData), columns =
MultiHeaders)
最后,将数据框保存到excel文件中
writer = pd.ExcelWriter('CDFarm_results_pandas.xlsx', engine='xlsxwriter')
CDFarm_results.to_excel(writer, 'Sheet1')
writer.save()
请看我的要点:此脚本能够将所有参数、目标和变量的名称和值保存到excel文件中
最终的excel如下所示:此代码适用于存储变量和目标,但不适用于参数。我试图只保存变量和目标,这非常有效。对于参数行,它表示:numpy.float64对象没有属性名。然后,我将参数代码修改为以下内容:请参见model.component_objectsParam中parmobject的下一个注释,active=True:nametoprint=strsttrparmobject.name用于parmobject中的索引:vtoprint=valueparmobject[index]data[index]=vtoprint,但这些代码可以存储每个pamameter;但不是模型价格。这是因为模型。价格是可变的吗?