How do I plot a symbolic function of one variable for a specific set of argument values?

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Valeri Aronov 2021-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/843445-how-do-i-plot-a-symbolic-function-of-one-variable-for-a-specific-set-of-argument-values

编辑： Valeri Aronov 2021-6-3

Say, I have a symbolic function y(x). There is no support for plotting it when x=logspace(1, 5, 101) in fplot(). How do I do it nicely?

回答（1 个）

Walter Roberson 2021-5-30

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/843445-how-do-i-plot-a-symbolic-function-of-one-variable-for-a-specific-set-of-argument-values#answer_712600

在 MATLAB Online 中打开

syms y(x)

y(x) = cos(x) * exp(-x/10)

y(x) =

fplot(y, [10 100])

title('fplot')

X = logspace(1, 2, 101);

Y = double(subs(y, x, X));

plot(X, Y)

title('subs')

I have unaccepted the almost good given answer after a closer examination. I am sorry about being too quick. The purpose of using logspace for x was to spread its values in such a way that they are equidistant on the plot. They are not in the given solution.

Valeri Aronov 2021-6-3