how to perform FFT on multivalued bit string?

Question

Jyothi Alugolu 2017-3-27

0
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https://ww2.mathworks.cn/matlabcentral/answers/332092-how-to-perform-fft-on-multivalued-bit-string

回答： Walter Roberson 2017-3-27

hi,

i have a bit string of size 560*1 of values 0 and 1 and some cells contains both 0 and 1 values.. now, i need to apply FFT on this bit string.. to do so, first i need to convert cell values to double values by making use of Cell2mat function (bcz FFT function can be applied on double values only).. so, i used cell2mat function and i applied fft on it... i got wrong results... i.e., if a cell in bit string contains [0,1] ,then after using cell2mat function the values 0 and 1 are being splitted and size of bit string is being increased...

code for binary string :

new_len = 576;
old_len = length(a);
mapped_index = 1 + mod((1:old_len) - 1, new_len);
b = accumarray( mapped_index(:), a(:), [new_len 1], @(L) {unique(L.')} ) .';
B1=cell2mat(b);
 b2=B1';

i got error: undefined function fft for input arguments of type cell...

Can anyone help me with this..