# How can I calculate a formula h(t)=4.0+6​.0te^-0.5t​-4.0e^-0.2​5cos(0.75p​i.t)?

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Keith on 29 Sep 2022
Edited: Les Beckham on 29 Sep 2022
Im so confused

Kevin Holly on 29 Sep 2022
Edited: Kevin Holly on 29 Sep 2022
You need to make sure all terms that are multiplied use *. Also replace e with 10^ assuming the e is exponent notation.
t = 1:100;
h = 4.0+6.0*t*10^-0.5-(4*10^-0.25)*cos(0.75*pi*t);
plot(t,h)
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Les Beckham on 29 Sep 2022
Edited: Les Beckham on 29 Sep 2022
I think that the e terms are actually exponentials, like e^-1, rather than exponential notation like 10e-1. So, e^-0.5t, for example, might actually be intended to be exp(-0.5*t). If this is the case the code and resulting plot are as shown below.
@Keith will have to decide which is correct.
t = 0:0.01:100;
h = 4.0 + 6.0*t.*exp(-0.5*t) - 4.0*exp(-0.25*cos(0.75*pi*t));
plot(t, h)
grid on

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