why I cant use laplace?

A=1;

Fs=10000;

f=0.01;

T=3*(1/f);

c=50;

t=0:1/Fs:T-1/Fs;

ut=A*square(2*pi*f*t,c);

plot(t,ut)

Us=laplace(ut)

Check for incorrect argument data type or missing argument in call to function 'laplace'.

Answer 1

[Steven Lord]

which -all laplace

/MATLAB/toolbox/symbolic/symbolic/@sym/laplace.m  % sym method

The laplace function is only defined for symbolic inputs. Your ut is not symbolic, it is a numeric array.

A=1;
Fs=10000;
f=0.01;
T=3*(1/f);
c=50;
t=0:1/Fs:T-1/Fs;
ut=A*square(2*pi*f*t,c);
whos ut

  Name      Size                    Bytes  Class     Attributes

  ut        1x3000000            24000000  double