how to calculate functions

Question

sumaiya hossain 2022-8-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1772845-how-to-calculate-functions

回答： Steven Lord 2022-8-2

syms t
t =  -3:0.1:10;
y = 4*sin(2*pi*t) + exp(-t)/t;
tlim = ([-1 10]);
Out = subs(y);
vpa_Out =vpa(Out);
plot(t,y)

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sumaiya hossain 2022-8-2

The code keeps on saying 'syms' requires Symbolic Math Toolbox.

Error in func_t (line 2)

syms t

Just to clarify this is how you code for the function to be calculated?

Torsten 2022-8-2

The code keeps on saying 'syms' requires Symbolic Math Toolbox.

And do you have the license ?

What do you get when you enter

[status,errmsg] = license('checkout','Symbolic_Math_Toolbox')

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Answer 1

Steven Lord 2022-8-2

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1772845-how-to-calculate-functions#answer_1019985

在 MATLAB Online 中打开

You don't need the line of code where you define t as a symbolic variable, since on the next line you throw that symbolic variable away and assign a numeric vector to that identifier.

t = -3:0.1:10;

I believe you will need to make one change to your function. You need to use element-wise division (./) instead of matrix division (/) in the second term if you want to divide each element of exp(-t) by the corresponding element of t.

y = 4*sin(2*pi*t) + exp(-t)./t;

plot(t,y)

Note that your function is undefined at t = 0.