how to enter exponential multiplication with a time dependent array

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"

Answer 1

[Walter Roberson]

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.

Answer 2

[Alexander]

Do you mean something like that:

t=0:0.06:3;

fa=10*exp(-5*t)

plot(t,fa)