Numerical results for symbolic expressions could not be obtained

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L siky
L siky 2023-11-16
编辑： Dyuman Joshi 2023-11-16
syms z T t s;
cz = (1-exp(-10*T)*z^(-1))/((2-exp(-10*T)*z^(-1))*(1-z^(-1)))
cs = subs(cz, z,exp(s*T))
ct = ilaplace(subs(cs,T,0.07),s,t)
y = eval(subs(ct,t,0.1))
stem(0.1,eval(y))
while I got
Unable to convert expression containing remaining symbolic function calls into double array. Argument must be expression that evaluates to number.
Any help would be appreciated！
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Dyuman Joshi
Dyuman Joshi 2023-11-16
编辑：Dyuman Joshi 2023-11-16
Ran in:
Firstly, do not use eval(). It is strongly recommended to not use it nor is it required here.
Secondly, "y" is a symbolic expression, how do you plan to plot a stem plot using it? As a stem() requires numerical data to plot.
What are you trying to do? What is the objective here?
syms z T t s;
cz = (1-exp(-10*T)*z^(-1))/((2-exp(-10*T)*z^(-1))*(1-z^(-1)));
cs = subs(cz, z,exp(s*T));
ct = ilaplace(subs(cs,T,0.07),s,t);
y = subs(ct,t,0.1)
y = 

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