# How to plot c(t) vs t

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vetri veeran on 12 Aug 2014
Commented: Yu Jiang on 12 Aug 2014
How to plot c(t) vs t with these parameters for various values of v
c(t)=c0-c03*k*(1/cmin-1/cmax)*v*u(t)
where,
u(t)=1, t0
0, t<0
Cmin=10e-9
Cmax=10e-6
C0=100e-9
K=10e6

Yu Jiang on 12 Aug 2014
Edited: Yu Jiang on 12 Aug 2014
I would first define a function as follows:
function y = Cfun(t, v)
u = double(t>=0);
Cmin = 10e-9;
Cmax = 10e-6;
C0 = 100e-9;
K = 10e6;
C03 = C0; % I don't know what C03 is, so I set it the same as C0.
y = C0-C03*K*(1/Cmin-1/Cmax)*v*u;
end
Then, create a different MATLAB file with the following code
t = linspace(-10,10,100);
y = [];
for v = [1,5,-1,-5]
y = [y; Cfun(t,v)];
end
plot(t,y(1,:),t,y(2,:),t,y(3,:),t,y(4,:))
legend('v=1', 'v=5', 'v=-1', 'v=-5')
Then, you should be able to see the figure as expected.
-Yu
Yu Jiang on 12 Aug 2014
Did you put them into to different MATLAB files and execute the script file? It seems to me that you are executing the function file.