Help using FFT and IFFT in matlab

i just want to calculate dft and idft of a given matrix and plot it. using fft and ifft function in matlab
given matrix a=[0 1 2 3]
just calculate its dft using fft and plot it.
i hd made a program that finds it and plot it but it plots only real axis.
i m writing code for it.
a=[0 1 2 3];
for i=1:4,
hold on
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