我正在嘗試在 Python 中運(yùn)行 CPLEX .mod 文件。有關(guān)如何執(zhí)行此操作的講師位于以下鏈接中：如何使用 python 運(yùn)行 .mod 文件 (CPLEX)？但似乎（也許）只有元組從 Python 發(fā)送到 CPLEX。就我而言，CPLEX .mod 文件中有一個(gè)循環(huán)，如下所示：for (var i = lowerBound; i <= upperBound; i++) {...} 我想將參數(shù) lowerBound 和 upperBound 從 Python 發(fā)送到 CPLEX .mod 文件。為此，我在 CPLEX .mod 文件內(nèi)、for 循環(huán)之前定義了一個(gè)變量，如下所示：var lowerBound = ...;var upperBound = ...;然后，我在 Python 中使用以下命令：from doopl.factory import *with create_opl_model(model="model.mod") as opl: opl.set_input("upperBound", 50) opl.set_input("lowerBound", 1) opl.run()但出現(xiàn)以下錯(cuò)誤：ERROR at 17:18 model.mod: Scripting parser error: missing expression.我想說(shuō)的是，在 CPLEX .mod 中，第 17 行和第 18 行是：var lowerBound = ...; var upperBound = ...;問(wèn)題：我想知道是否只發(fā)送元組opl.set_input ()？為了理解這一點(diǎn)，我做了如下的事情：CPLEX .mod 內(nèi)部：tuple bounds { int lowerBound; int upperBound; } for (var i = lowerBound; i <= upperBound; i++) { ...}Python 內(nèi)部：from doopl.factory import *Bounds = [ (1, 50), ]with create_opl_model(model=" model.mod") as opl: opl.set_input("bounds", Bounds) opl.run()但這一次，出現(xiàn)了如下錯(cuò)誤：ERROR at 20:7 model.mod: Scripting parser error: missing ';' or newline between statements.我想說(shuō)的是，在 CPLEX .mod 文件中，第 20 行與元組邊界的定義相關(guān)，即：tuple bounds { int lowerBound; int upperBound; }有什么辦法可以解決這個(gè)問(wèn)題？
1 回答
慕神8447489
TA貢獻(xiàn)1780條經(jīng)驗(yàn) 獲得超1個(gè)贊
你需要使用元組集，但在
tuple bounds {
int lowerBound;
int upperBound;
}
那不是你所做的。
你應(yīng)該寫(xiě)
tuple typebounds {
int lowerBound;
int upperBound;
}
{typebounds} bounds=...;
在你的 .mod 文件中
讓我分享一個(gè)完整的例子：
from doopl.factory import *
# Data
Buses=[
(40,500),
(30,400)
]
MinAndMax=[(1,5)]
# Create an OPL model from a .mod file
with create_opl_model(model="zootuplesetwithminandmax.mod") as opl:
# tuple can be a list of tuples, a pandas dataframe...
opl.set_input("buses", Buses)
opl.set_input("singletonMinAndMax", MinAndMax)
# Generate the problem and solve it.
opl.run()
# Get the names of post processing tables
print("Table names are: "+ str(opl.output_table_names))
# Get all the post processing tables as dataframes.
for name, table in iteritems(opl.report):
print("Table : " + name)
for t in table.itertuples(index=False):
print(t)
# nicer display
for t in table.itertuples(index=False):
print(t[0]," buses ",t[1], "seats")
與zootuplesetwithminandmax.mod
int nbKids=300;
// a tuple is like a struct in C, a class in C++ or a record in Pascal
tuple bus
{
key int nbSeats;
float cost;
}
// This is a tuple set
{bus} buses=...;
tuple minandmax
{
int m;
int M;
}
{minandmax} singletonMinAndMax=...;
int minBuses=first(singletonMinAndMax).m;
int maxBuses=first(singletonMinAndMax).M;
// asserts help make sure data is fine
assert forall(b in buses) b.nbSeats>0;
assert forall(b in buses) b.cost>0;
// decision variable array
dvar int+ nbBus[buses] in minBuses..maxBuses;
// objective
minimize
sum(b in buses) b.cost*nbBus[b];
// constraints
subject to
{
sum(b in buses) b.nbSeats*nbBus[b]>=nbKids;
}
tuple solution
{
int nbBus;
int sizeBus;
}
{solution} solutions={<nbBus[b],b.nbSeats> | b in buses};
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