# how to plot decaying exponential

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Romio il 6 Mag 2019
Commentato: gonzalo Mier il 6 Mag 2019
Hello,
I'd like to plot a decaying exponential function similar to this plot, while being able to vary the spike time and rate of decay as well as the amplitude.
I tried to use the following script but it does not produce a similar plot
t=0:100;
spike_time = 20;
spike_peak =0.2;
spike_decay =5;
g = zeros(length(t),1);
for k = 1:length(t)
if t(k) <= spike_time
g = 0;
else
g = spike_peak*exp(-(t-spike_time)/spike_decay);
end
end
plot(t,g)
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### Risposta accettata

gonzalo Mier il 6 Mag 2019
Congratulation! You have your algorithm almost working, but you are using vector when you should be using scalars (As you have your code implemented. Try with this:
t=0:100;
spike_time = 20;
spike_peak =0.2;
spike_decay =5;
g = zeros(length(t),1);
for k = 1:length(t)
if t(k) <= spike_time
g(k) = 0;
else
g(k) = spike_peak*exp(-(t(k)-spike_time)/spike_decay);
end
end
plot(t,g)
As I said before, good job
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Romio il 6 Mag 2019
Thank you!
gonzalo Mier il 6 Mag 2019
Don't forget to accept the answer if it worked for you ;)

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