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

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?

Answer 1

[Ameer Hamza]

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.

[Poojitha Ariyathilaka]

Great! That happened. I think I hv followed a wrong tutorial of a later version of MATLAB on my R2018a.

[Ameer Hamza]

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.

[Poojitha Ariyathilaka]

Yes an older version, thank you!