for loop for fft

Hi, how can I write a for loop for a range
for i=1:68
U1(1,i) = u_gdc(1,i);
gg = fft(U1);
P2 = (abs((gg/L)));
P1 = (P2(1:L/2+1));
P1(2:end-1) = 2*P1(2:end-1);
end
and P1 should has finally 1 row and 68 column.
thx

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2020-2-9

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