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how to enter exponential multiplication with a time dependent array

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Given fa(t)=10*e^-5t and a time array of t=0:0.06:3 how do I enter this?
I have tried fa(t)=10*exp(-5*t) and I get an error message saying that the "Array indices must be positive intergers or logical values"

Risposta accettata

Walter Roberson
Walter Roberson il 10 Mar 2024
You need to decide whether you are doing array indexing, or are creating a formula.
t=0:0.06:3;
fa(t)=10*exp(-5*t)
is interpreted as array indexing. Using () indexing on the left hand side of an assignment is almost always interpreted as array indexing.
The formula form would be
t=0:0.06:3;
fa = @(t) 10*exp(-5*t);
plot(t, fa(t))
The major exception is if you are using a symbolic variable, then
syms t
fa(t)=10*exp(-5*t)
creates a formula, which you then apply like
T=0:0.06:3;
plot(T, fa(T))
But easiest is usually what Alexander shows,
t=0:0.06:3;
fa=10*exp(-5*t)
plot(t,fa)
which is pure expression form.

Più risposte (1)

Alexander
Alexander il 10 Mar 2024
Modificato: Alexander il 10 Mar 2024
Do you mean something like that:
t=0:0.06:3;
fa=10*exp(-5*t)
plot(t,fa)

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