MATLAB File Read and Plot Example

Plot FFT using Matlab

fileID1 = fopen('real_part.txt','r');
rr = fscanf(fileID1,'%d');
fileID2 = fopen('im_part.txt','r');
ii = fscanf(fileID2,'%d');
rr_2 = rr.^2;
ii_2 = ii.^2;
sum = rr_2 + ii_2 ;
mag = db(sum);
plot(mag(1:32768));
grid on;

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Assume that there are 2 .txt file in the working directory. We can read and fill the values inside them to 2 array named as rr and ii.