why I cant use laplace?

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Pablo Álvarez García
回答： Steven Lord 2022-1-6
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'.

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采纳的回答

Steven Lord
Steven Lord 2022-1-6
Ran in:
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

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