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"
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Walter Roberson
2024-3-10
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.
更多回答（1 个）
Do you mean something like that:
t=0:0.06:3;
fa=10*exp(-5*t)
plot(t,fa)
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