Matlab CPLEX&x2B；雅尔米普--”；未找到解算器"；？

我正在尝试开始，这是一个Matlab接口，用于优化解算器，如。我有一个目标函数obj和约束cons，我把它们插入了Yalmip

options=sdpsettings('solver','Cplex'); %windows needs uppercase 'Cplex' and unix is ok with 'cplex' or 'Cplex'
solvesdp(cons,obj,options); %prints 'Warning: Solver not found'

在上述代码中，

solvesdp

打印警告：未找到解算器。包含

obj

、

cons

的

.m

和对Yalmip的调用在我朋友的计算机上工作，我们很困惑为什么它在我的计算机上不工作

---

以下是我在我的Ubuntu 12.04机器上使用Matlab R2012b对CPLEX和Yalmip的设置步骤：

在此处安装IBM CPLEX:

/home/user/IBM/ILOG/CPLEX_Studio125/CPLEX

在此处安装Yalmip:

home/user/Yalmip

将CPLEX和Yalmip添加到我的Matlab路径（并确认所有目录都存在）：

---

下面，我将解释我是如何尝试诊断问题的。很明显，Matlab可以看到CPLEX，Matlab可以看到Yalmip，但是Yalmip看不到CPLEX。

确认Yalmip和CPLEX在我的matlab路径中：

MATLAB> path
    /home/user/ibm/ILOG/CPLEX_Studio125/cplex/examples/src/matlab
    /home/user/ibm/ILOG/CPLEX_Studio125/cplex/matlab
    /home/forrest/ibm/ILOG/CPLEX_Studio125/cplex/matlab/help
    /home/forrest/ibm/ILOG/CPLEX_Studio125/cplex/matlab/help/helpsearch
    /home/forrest/ibm/ILOG/CPLEX_Studio125/cplex/matlab/help/topics
    /home/user/yalmip
    /home/user/yalmip/demos
    /home/user/yalmip/extras
    /home/user/yalmip/modules
    /home/user/yalmip/modules/bilevel
    /home/user/yalmip/modules/global
    /home/user/yalmip/modules/moment
    /home/user/yalmip/modules/parametric
    /home/user/yalmip/modules/robust
    /home/user/yalmip/modules/sos
    /home/user/yalmip/operators
    /home/user/yalmip/solvers
    ...

为了验证Matlab确实可以找到CPLEX，我运行了

help cplexlp

。它给出了有效的输出：

MATLAB> help cplexlp
cplexlp
Solve linear programming problems.
x = cplexlp(f,Aineq,bineq) solves the linear programming problem min f*x such that Aineq*x <= bineq.
...

---

我还环顾了IBM论坛，寻找这方面的答案。一位朋友向我指出了诊断CPLEX/Yalmip的问题，但这篇文章更关注Windows，并没有真正解决我的问题

---

更多详情：

• Yalmip版本2012-09-26
• CPLEX版本12.5

---

在深入研究Yalmip源代码之后，我最终发现了问题所在

在Yalmip源代码中，有一个名为

Yalmip/solvers/definesolvers.m

的文件。在definesolvers.m中，有一系列类似这样的语句：

solver(i) = lpsolver;
solver(i).tag     = 'CPLEX';
solver(i).version = 'IBM';
solver(i).subversion = '12.4';
solver(i).checkfor = {'cplexlp.m','cplexlink124'};
...

这些语句适用于CPLEX 12.0、12.1、12.2、12.3和12.4。但是，我使用的是CPLEX 12.5，对于CPLEX 12.5没有这样的声明

我将

12.4

的所有实例替换为

12.5

，并将

cplexlink124

的实例替换为

cplexlink125

。我的优化代码现在可以工作了

下面是

yalmiptest

的新输出：

>> yalmiptest
+++++++++++++++++++++++++++++++++++++++++++++++
|       Searching for installed solvers       |
+++++++++++++++++++++++++++++++++++++++++++++++
|        Solver|   Version/module|      Status|
+++++++++++++++++++++++++++++++++++++++++++++++
|         CPLEX|              IBM|       found|
|         CPLEX|              IBM|       found|
|         CPLEX|              IBM|       found|
|       LINPROG|                 |       found|
|      QUADPROG|                 |       found|
|        LMILAB|                 |       found|
|       FMINCON|        geometric|       found|
|       FMINCON|         standard|       found|
|    FMINSEARCH|                 |       found|
|           BNB|                 |       found|
|      BINTPROG|                 |       found|
|        CUTSDP|                 |       found|
|        BMIBNB|                 |       found|
|         KKTQP|                 |       found|
|          NONE|                 |       found|
|     LSQNONNEG|                 |       found|
|        LSQLIN|                 |       found|
|        GUROBI|           GUROBI|   not found|
|        GUROBI|              MEX|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
...

我猜剩余的

CPLEX | IBM | notfound |

行意味着没有找到CPLEX 12.0、12.1、12.2和12.3

solver(i) = lpsolver;
solver(i).tag     = 'CPLEX';
solver(i).version = 'IBM';
solver(i).subversion = '12.4';
solver(i).checkfor = {'cplexlp.m','cplexlink124'};
...

>> yalmiptest
+++++++++++++++++++++++++++++++++++++++++++++++
|       Searching for installed solvers       |
+++++++++++++++++++++++++++++++++++++++++++++++
|        Solver|   Version/module|      Status|
+++++++++++++++++++++++++++++++++++++++++++++++
|         CPLEX|              IBM|       found|
|         CPLEX|              IBM|       found|
|         CPLEX|              IBM|       found|
|       LINPROG|                 |       found|
|      QUADPROG|                 |       found|
|        LMILAB|                 |       found|
|       FMINCON|        geometric|       found|
|       FMINCON|         standard|       found|
|    FMINSEARCH|                 |       found|
|           BNB|                 |       found|
|      BINTPROG|                 |       found|
|        CUTSDP|                 |       found|
|        BMIBNB|                 |       found|
|         KKTQP|                 |       found|
|          NONE|                 |       found|
|     LSQNONNEG|                 |       found|
|        LSQLIN|                 |       found|
|        GUROBI|           GUROBI|   not found|
|        GUROBI|              MEX|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
|         CPLEX|              IBM|   not found|
...