MATLAB: How to plot decaying exponential

MATLABplotting

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.
decaying.gif
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)

Best Answer

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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