MATLAB Answers

How can i solve for this issue with the logical flow

2 views (last 30 days)
Mark Loui
Mark Loui on 6 May 2021
Commented: Mark Loui on 6 May 2021
n=length(q);
coef=k*dt/dr;
q_new=zeros(n,1);
q(0)=0;
% for i=1:n+1
% q_new(i)=q(i)+(coef*(q(i+1)-(2*q(i))+q(i-1)));
% end
for i=1:n+1
term1=(q(i+1)*((r(i+1)+dr)/r(i)*dr));
term2=2*q(i)*(1/dr);
term3=q(i-1)*((r(i)-dr)/r(i)*dr);
qnew(i)=q(i)+(coef*(term1-term2+term3));
q_new=qnew(i);
end
Can someone please help me with this i cant seem to make it work, what can i do to make the the error of logical go away?
Array indices must be positive integers or logical values: %This is the error show

Accepted Answer

Chad Greene
Chad Greene on 6 May 2021
I think the error is here:
term3=q(i-1)*((r(i)-dr)/r(i)*dr);
The first time through the loop, i=1, meaning i-1=0. There is no zeroth element of q. Which element of q are you trying to access?
  3 Comments

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by