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# for loop help matlab error

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B on 24 Mar 2015
Closed: MATLAB Answer Bot on 20 Aug 2021
I really can't understand the arrays and matrices system in matlab...:( Please help with the following; I'm getting (??? Attempted to access Tc(21); index out of bounds because numel(Tc)=20.
Error in ==> newestt at 9 Tc0=Tc(i);) ================================================================================================== num=20; for i=2:num; Tc0=110; Tc(20)=27; Tc(1)=109; detaTc=(Tc0-Tc(20))/num; Tc(i)=(Tc0- detaTc) i=i+1; Tc0=Tc(i); end
Thanks!~

Julia on 24 Mar 2015
Hi,
The error states clearly, that you try to access the 21st entry of Tc, but Tc has only 20 entries:
i=i+1;
Tc0=Tc(i);
In the last iteration for i=num (in your example i=20), this leads to the error.
Julia on 24 Mar 2015
num=20;
Tc0=110;
Tc(20)=27;
Tc(1)=109;
for i=2:num;
detaTc=(Tc0-Tc(20))/num;
Tc(i)=(Tc0- detaTc)
Tc0=Tc(i);
end
If you set Tc0=110 inside the loop it will always overwrite the vale Tc0=Tc(i).

Stalin Samuel on 24 Mar 2015
num=20;
for i=2:num;
Tc0=110;
Tc(20)=27;
Tc(1)=109;
detaTc=(Tc0-Tc(20))/num;
Tc(i)=(Tc0- detaTc)
Tc0=Tc(i);
i=i+1;
end
##### 2 CommentsShowHide 1 older comment
Stephen23 on 24 Mar 2015
@stalin samuel: Note that you should avoid using i and j as loop variable names, as these are names of the inbuilt imaginary unit.

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