# error using plot data must be numeric, datetime, duration or an array convertible to double

3 views (last 30 days)
Pablo Álvarez García on 10 Feb 2022
Answered: Steven Lord on 10 Feb 2022
WHY IT GIVE ME AN ERROR???
t=[0:0.1:50]
syms s
gs=1/(s^2 + 5*s + 6);
roots([1 5 6])
gjw=fourier(gs)
plot(t,gjw)

Steven Lord on 10 Feb 2022
Let's see what you're trying to plot.
t=[0:0.1:50]
t = 1×501
0 0.1000 0.2000 0.3000 0.4000 0.5000 0.6000 0.7000 0.8000 0.9000 1.0000 1.1000 1.2000 1.3000 1.4000 1.5000 1.6000 1.7000 1.8000 1.9000 2.0000 2.1000 2.2000 2.3000 2.4000 2.5000 2.6000 2.7000 2.8000 2.9000
syms s
gs=1/(s^2 + 5*s + 6);
roots([1 5 6]);
gjw=fourier(gs)
gjw =
If you want to evaluate gjw for w equal to each of the elements in t you can do this, and then you can plot the result.
syms w
gjw_at_t = subs(gjw, w, t);
plot(t, gjw_at_t)
Warning: Imaginary parts of complex X and/or Y arguments ignored.
You might want to plot the real and imaginary parts of gjw_at_t separately.

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