When I tried to Laplace transform a differential equation, errors appeared, HELP

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Poojitha Ariyathilaka
评论： Poojitha Ariyathilaka 2020-6-13
syms x t s X F
F=laplace('diff(x(t),t,t)+7*diff(x(t),t)+10*x(t)=20',s)
How this transformation could be done otherwise?

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Ameer Hamza
Ameer Hamza 2020-6-13
编辑：Ameer Hamza 2020-6-13
According to documentation, laplace() accepts symbolic inputs. You should input the symbolic equation
syms x(t) s X F
F = laplace(diff(x(t),t,t)+7*diff(x(t),t)+10*x(t)==20, s)
Also, define syms x(t) as a symbolic function. Defining them seperately will give an error.
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Ameer Hamza
Ameer Hamza 2020-6-13
I am glad to be of help!
My guess is that you have followed a tutorial for an older version. In the past, char arrays were supported for symbolic toolbox functions, now that support is being removed.

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