dont work syms??

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thanos zisopoulos
thanos zisopoulos 2017-11-14
评论： Baojun Yuan 2023-1-23
nothing example with syms dont work in matlab for example this syms y(t) a eqn = diff(y,t,2) == a*y; ySol(t) = dsolve(eqn)
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thanos zisopoulos
thanos zisopoulos 2017-11-14
编辑：Stephen23 2017-11-14
syms y(t) a
eqn = diff(y,t,2) == a*y;
ySol(t) = dsolve(eqn)
Error using assignin
Invalid variable name "y(t)" in ASSIGNIN.
Error in syms (line 56)
assignin('caller',varargin{i},sym(varargin{i}));
Baojun Yuan
Baojun Yuan 2023-1-23
same problem ...........

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回答（1 个）

Steven Lord
Steven Lord 2017-11-14
Which release of MATLAB and Symbolic Math Toolbox are you using? Based on that error I suspect you're using a release prior to release R2012a, when the ability to create symbolic functions was introduced.
The functionality described in the online documentation is for the most recent release. If you're using a sufficiently older release (6+ years is "sufficiently older") I recommend referring to the documentation included in your installation. That local documentation will not refer to features introduced after the release you're using.

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