我正在尝试开始使用

YALMIP,这是一个优化求解器的Matlab接口,例如

CPLEX.我有一个目标函数obj和约束缺点,我已将它们插入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'

在上面的代码中,solvesdp打印警告：未找到解算器. .m包含对象,缺点和对Yalmip的调用在我朋友的计算机上运行,​​我们很难理解为什么它不能在我的计算机上运行.

以下是我在使用Matlab R2012b的Ubuntu 12.04机器上执行的CPLEX和Yalmip的设置步骤：

>在此处安装IBM CPLEX：/ home / user / ibm / ILOG / CPLEX_Studio125 / cplex

>在这里安装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)：

addpath(genpath('/home/user/yalmip'))

addpath(genpath('/home/user/ibm/ILOG/CPLEX_Studio125/cplex/matlab'))

addpath(genpath('/home/user/ibm/ILOG/CPLEX_Studio125/cplex/examples/src/matlab'))

下面,我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,我运行了帮助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.

...

此外,哪个cplex提供此输出：/home/user/ibm/ILOG/CPLEX_Studio125/cplex/matlab/@Cplex/Cplex.p

yalmip给出了这个输出：/home/user/yalmip/extras/yalmip.m

我在Matlab命令提示符下运行了yalmiptest.输出验证Matlab可以找到Yalmip,但Yalmip找不到CPLEX：

MATLAB> yalmiptest

+++++++++++++++++++++++++++++++++++++++++++++++

| Searching for installed solvers |

+++++++++++++++++++++++++++++++++++++++++++++++

| Solver| Version/module| Status|

+++++++++++++++++++++++++++++++++++++++++++++++

| 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|

| CPLEX| IBM| not found|

| CPLEX| IBM| not found|

| CPLEX| IBM| not found|

| CPLEX| CPLEXINT| not found|

| CBC| | not found|

| GLPK| GLPKMEX-CC| not found|

我还在IBM论坛周围寻找答案.一位朋友向我指出了this post in the IBM forums关于诊断CPLEX / Yalmip的问题,但该帖子更侧重于Windows,并没有真正解决我的问题.

更多细节：

> Yalmip版本2012-09-26

> CPLEX 12.5版