Spliting arrays into different arrays, and extract them as an array

So, I have this code:

K=3:8

for N = 0:K:9 ; f_1(N+1:N+K)=R1(N+1:N+K).struct.fstat.f;end

A = yr(5:12);

B = f_1(1:8);

yr1_f = xcorr(A,B);

figure(1),plot(yr1_f)

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and when I excute, it gives me an error that my output is 3 numbers and from curly brace or dot indexing it can't give out 3 outputs.

My question is how can I modify the f_1 function so I can get my outputs as three number.

Thank you.

[SaiDileep Kola]

Coudn't figure out what you are trying to do, at the first go,

what are you trying to do with this N = 0:K:9 with K = 3:8 and what does it mean?