MATLAB示例失败 [英] MATLAB examples are failing

问题描述

我丝毫不知道这里发生了什么，Google也没有提供任何有趣的帮助.我从 http://www.mathworks.com/help中获取了以下示例/toolbox/symbolic/solve.html#inputarg_eqn

I don't have the slightest idea what's going on here, and Google provides no interesting help. I took the following example from http://www.mathworks.com/help/toolbox/symbolic/solve.html#inputarg_eqn

>> syms x
>> solve(x^2 + 4*x + 1 == 0)
??? Error using ==> char
Conversion to char from logical is not possible.

Error in ==> solve>getEqns at 169
   vc = char(v);

Error in ==> solve at 67
[eqns,vars] = getEqns(varargin{:});

这是怎么回事?

推荐答案

您正在阅读的文档不适用于您的MatLab版本.例如，我可以在2008b中重现您​​的错误.

The documentation you're reading doesn't apply to your version of MatLab. I can reproduce your error in 2008b, for example.

较早的文档说:

请注意，这些示例均采用f(x) = 0形式的方程式.如果需要求解形式为f(x) = q(x)的方程式，则必须使用带引号的字符串.特别是命令

Note that these examples assume equations of the form f(x) = 0. If you need to solve equations of the form f(x) = q(x), you must use quoted strings. In particular, the command

s = solve('cos(2*x)+sin(x)=1')

将来，请注意每个MatLab在线文档页面顶部的行，其中指出了文档适用的版本.

In the future, pay attention to the line at the top of every MatLab online documentation page where it says what version the documentation applies to.

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