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

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Aishah Malek
Aishah Malek 2018-7-18
回答： Aishah Malek 2018-7-22
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-')

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回答（2 个）

Aquatris
Aquatris 2018-7-18
编辑：Aquatris 2018-7-18
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.
Aishah Malek
Aishah Malek 2018-7-22
Thankyou it now works

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