d2/dt2*i（t）+25 d/dti（t）+100 *i（t）= 300
我想用二阶导数方程绘制x：time，y：i（t）图，我也用matlab

syms i(t)
eq = diff(i(t),t,2) + 25*diff(i(t),t) + 100*i(t) == 300;
condition = i(0) == 0 ;

sol(t) = dsolve(eq, condition) ; 
fplot(sol, [0,5]);

xlabel('Time (s)'); ylabel('i(t)');

然而，错误是这样出现的：使用fplot〉singleFplot的错误（第240行）输入必须是一个或多个单变量的函数。

Error in fplot>@(f)singleFplot(cax,{f},limits,extraOpts,args) (line 200)
        hObj = cellfun(@(f)
        singleFplot(cax,{f},limits,extraOpts,args),fn{1},'UniformOutput',false);

Error in fplot>vectorizeFplot (line 200)
        hObj = cellfun(@(f)
        singleFplot(cax,{f},limits,extraOpts,args),fn{1},'UniformOutput',false);

Error in fplot (line 166)
hObj = vectorizeFplot(cax,fn,limits,extraOpts,args);

Error in test (line 6)
fplot(sol, [0,5]);`

您知道如何解决此错误吗？