how to plot decaying exponential

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)

Answer 1

[gonzalo Mier]

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

[Romio]

Thank you!

[gonzalo Mier]

Don't forget to accept the answer if it worked for you ;)