Simplest version I can think of
t=0:0.1:100; % Time vector
A=0.1; % Value of A that you can change
plot(t,1-exp(-A(n)*t)) % Represent it on a figure
If you place the cursor on the value of A you can try several values using the Editor tools (look on the tools of your editor window - 1.0 + ... press those symbols and the script runs with a new value for A)
Just for fun here's a version using subplots
clf
t=0:0.1:10;
A=[0.01 0.1 0 1];
for n=1:4
subplot(2,2,n)
plot(t,1-exp(-A(n)*t))
title(['A=' num2str(A(n))])
end
