# How do I get a loop that takes a sum to store each value in a vector?

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Adam Palmer el 5 de Ag. de 2014
Comentada: Star Strider el 5 de Ag. de 2014
Hey Matlab community, y'all have been very helpful. I got another one for ya. I have a potential formula that takes the sum of series I made. What I want is each sum to be stored in a vector after each iteration, so that I can plot it. heres my code. Also I think it requires an empty vector of correct dimensions such as zeros(blah,blah) but I must have done it wrong because it returns empty
sumv=0;
n=0;
an=0;
for k=1:120
an=.68+sumv-(.68+sumv).*.0693;
sumv=an;
end
Your help and suggestions are greatly appreciated
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Star Strider el 5 de Ag. de 2014
Editada: Star Strider el 5 de Ag. de 2014
If you want the value of sumv stored at each iteration of your k loop, index it to create a vector from it:
sumv(1)=0;
n=0;
an=0;
for k=1:120
an=.68+sumv(k)-(.68+sumv(k)).*.0693;
sumv(k+1)=an;
end
figure(1)
plot(sumv)
grid
You could preallocate by putting:
sumv = zeros(1,121);
in place of:
sumv(1)=0;
That’s good programming practice, but here it likely doesn’t make much of a difference in terms of speeding up your loop. I decided to keep with your original construction rather than preallocate.
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Adam Palmer el 5 de Ag. de 2014
Alright, I gotcha. Thanks Star Strider!
Star Strider el 5 de Ag. de 2014
My pleasure!
(Your ‘y’all’ got my attention. W&L and UVA here...)

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