Hi , how can i plot of the sum of ode solutions using the sum function?

Hi , I have plotted the following ode equations , and have plotted the sum of the solutions,how can i generalise the solution using the sum function?

clf
[tv,c] = ode45('beckerdorin',[0,3],[6,0,0,0]);
figure(2)
plot(tv,c(:,1),'r');hold on
plot(tv,c(:,2),'b');hold on
plot(tv,c(:,3),'y');hold on
plot(tv,c(:,4),'g');
title('Becker Doring Experiment')
figure(8)

plot(tv,c(:,1) +c(:,2) +c(:,3) +c(:,4),'m-');

I have tried the following, but i get a error.

figure(9)
plot(tv,sum(c(:,(1:1:4))),'m-')

Answer 1

[Aquatris]

You should use;

plot(tv,sum(c(:,1:4)'),'m-')

sum command sums each column, however, what you want is the sum of the rows. A simple transpose does the trick.

[Walter Roberson]

You can alternately use sum(c(:,1:4),2)

Answer 2

[Aishah Malek]

Thankyou it now works