matlab - Matlab cvx错误与cvx_begin

Question

我使用 windows x64、cvx x64 和 Matlab x64 R2012a

但是当我运行一个简单的例子时（\cvx\examples\quickstart.m）它给了我一个错误：

>> quickstart

has_quadprog = exist( 'quadprog' );
has_quadprog = has_quadprog == 2 | has_quadprog == 3;
has_linprog  = exist( 'linprog' );
has_linprog  = has_linprog == 2 | has_linprog == 3;
rnstate = randn( 'state' ); randn( 'state', 1 );
s_quiet = cvx_quiet(true);
s_pause = cvx_pause(false);
cvx_clear; echo on

prob = evalin( 'caller', 'cvx_problem', '[]' );
if isa( prob, 'cvxprob' ),

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% SECTION 2.1: LEAST SQUARES %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Input data
m = 16; n = 8;
A = randn(m,n);
b = randn(m,1);

% Matlab version
x_ls = A \ b;

% cvx version
cvx_begin
Attempt to reference field of non-structure array.

Error in cvxprob (line 48)
    selected = cvx___.solvers.selected;

Error in cvx_begin (line 41)
assignin( 'caller', 'cvx_problem', cvxprob( varargin{:} ) );

Error in quickstart (line 25)
cvx_begin

score 8 · Accepted Answer

安装比较简单：

下载 CVX（我得到的cvx-rd.zip发行版只包含免费的求解器，所有支持的平台都包含预编译的 MEX 二进制文件）。
在某处解压缩 ZIP 文件，例如C:\cvx

在 MATLAB 中导航到该目录，然后运行cvx_setup：

>> cd('C:\cvx')
>> cvx_setup

---------------------------------------------------------------------------
CVX: Software for Disciplined Convex Programming       (c)2014 CVX Research
Version 2.1, Build 1088 (e790d80)                  Sat Sep 20 22:03:02 2014
---------------------------------------------------------------------------
Installation info:
    Path: C:\cvx
    MATLAB version: 8.3 (R2014a)
    OS: Windows 8 amd64 version 6.2
    Java version: 1.7.0_11
Verfying CVX directory contents:
    No missing files.
Preferences: none found; defaults loaded.
---------------------------------------------------------------------------
Setting CVX paths...done.
Saving updated path...done.
Searching for solvers...3 shims found.
2 solvers initialized (* = default):
 *  SDPT3    4.0     {cvx}\sdpt3
    SeDuMi   1.34    {cvx}\sedumi
1 solver skipped:
    GLPK             
        Could not find a GLPK installation.
Saving updated preferences...done.
Testing with a simple model...done!
---------------------------------------------------------------------------
To change the default solver, type "cvx_solver <solver_name>".
To save this change for future sessions, type "cvx_save_prefs".
Please consult the users' guide for more information.
---------------------------------------------------------------------------

现在您可以运行以下示例之一：
```
>> cd('C:\cvx\examples')
>> quickstart
```

如果您想连接到外部求解器（Gurobi 和 MOSEK），请阅读文档中的相应部分。这需要 CVX Professional 许可证。

matlab - Matlab cvx错误与cvx_begin

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