How to find strings in a file using MATLAB -


i have file contains repeating strings. file large give simple example:

a    b    c w       g b    v    f

i want extract a b array. how can in matlab?

try using textscan. can split file '\n' , whitespace cell2mat.

fid = fopen('your_string_file.ext'); input = textscan(fid, '%s', 'delimiter', '\n'); cellmatrix = cell2mat(input{1});   cellmatrix =      b c      d f      b v f

then if there specific pattern want can walk cellmatrix. assuming want a b pattern within single row following:

pattern = ['a', 'b']; patindex = 1; dims = size(cellmatrix); i=1:dims(1)     patindex = 1;     j=1:dims(2)         if strcmp(cellmatrix(i,j), ' ')             continue         end         if strcmp(cellmatrix(i,j), pattern(patindex))             patindex = patindex+1;             if patindex > length(pattern)                 found... store location/do want                 patindex = 1;             end         else             patindex = 1;         end     end end

you can change check find whatever pattern want matrix.

this assumes file fit memory -- if it's large fit in half memory you'll need trickier incremental passes , file writing.


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