MATLAB: I wanna make short code program (development)

Question

This's my original code it's long code I wish someone can help me to make It's short code version plz.

n=0:64;
N=64;
fx3(1:65)=0;fx4(1:65)=0;fx5(1:65)=0;fx6(1:65)=0;
fx7(1:65)=0;fx8(1:65)=0;fx9(1:65)=0;fx10(1:65)=0;
fx3(4)=1;fx4(5)=1;fx5(6)=1;fx6(7)=1;
fx7(8)=1;fx8(9)=1;fx9(10)=1;fx10(11)=1;
fxt3=fft(fx3);fxt4=fft(fx4);fxt5=fft(fx5);fxt6=fft(fx6);fxt7=fft(fx7);
fxt8=fft(fx8);fxt9=fft(fx9);fxt10=fft(fx10);
fim3=imag(fxt3)/N;
freal3=real(fxt3)/N;
fim4=imag(fxt4)/N;
freal4=real(fxt4)/N;
fim5=imag(fxt5)/N;
freal5=real(fxt5)/N;
fim6=imag(fxt6)/N;
freal6=real(fxt6)/N;
fim7=imag(fxt7)/N;
freal7=real(fxt7)/N;
fim8=imag(fxt8)/N;
freal8=real(fxt8)/N;
fim9=imag(fxt9)/N;
freal9=real(fxt9)/N;
fim10=imag(fxt10)/N;
freal10=real(fxt10)/N;
%................................................
for i=1:65
    fphase3(i)=atan(fim3(i)/freal3(i));
    fphase4(i)=atan(fim4(i)/freal4(i));
    fphase5(i)=atan(fim5(i)/freal5(i));
    fphase6(i)=atan(fim6(i)/freal6(i));
    fphase7(i)=atan(fim7(i)/freal7(i));
    fphase8(i)=atan(fim8(i)/freal8(i));
    fphase9(i)=atan(fim9(i)/freal9(i));
    fphase10(i)=atan(fim10(i)/freal10(i));
end
%.................................................
figure(1)
subplot(4,2,1);
stem(n,fphase3);
title('Phase of Impuse at m=3 ')
grid on
subplot(4,2,2);
stem(n,fphase4);
title('Phase of Impuse at m=4 ')
grid on
subplot(4,2,3);
stem(n,fphase5);
title('Phase of Impuse at m=5 ')
grid on
subplot(4,2,4);
stem(n,fphase6);
title('Phase of Impuse at m=6 ')
grid on
subplot(4,2,5);
stem(n,fphase7);
title('Phase of Impuse at m=7 ')
grid on
subplot(4,2,6);
stem(n,fphase8);
title('Phase of Impuse at m=8 ')
grid on
subplot(4,2,7);
stem(n,fphase9);
title('Phase of Impuse at m=9 ')
grid on
subplot(4,2,8);
stem(n,fphase10);
title('Phase of Impuse at m=10 ')
grid on

Answer 1

I copied your code exactly and ran it in R2016b. No error showed up.

Possibly you had an existing variable that was interfering with the execution.