How to split a number in MATLAB?

How to retrieve the file from txt to matlab, split it into numbers with 3 digits each and built a 0/1 matrix?

• if i have this in the txt file 001003005 002006007008 how can I (1) retrieve the file from txt to matlab (2) split this into numbers with 3 digits each (3) built a 0/1 matrix from it using matlab so that the matrix will look like this [1 0 1 0 1 0 0 0; 0 1 0 0 0 1 1 1] meaning to say that 001 will give 1 in the first column(first row), 003 will give 1 in third column(first row), and 005 will give 1 in fifth column (first row) but the 2nd, 4th, 6th, 7th and 8th column (first row) will be 0. and same with the second row ...since the greatest number is 8. so we have 2 X 8 size of the matrix..

• Answer:

  Dear Nicholas, The script below will do what you asked, provided that the inputs are as described by you. However, it doesn't fully check that the format of data from the input file matches your description. Thus, you could have problems if the inputs consist of nonnumeric characters, or if the three-digit numbers are not positive. Also, the script does not verify that there are leading zeros on small numbers, so " 12" and "012" will be treated the same way, for example. By contrast, leaving out trailing zeros will not be treated the same way (for instance, "12 " will be understood as 12, whereas "120" is simply 120). I leave it to you to check that your data have the correct format and to handle situations that could occur if the format differs from your description. % Set the number of digits for each number to be read from the input file. num_digits = 3; filename_in = 'YANicholas.txt'; ifile_in = fopen(filename_in); sline_in = fgetl(ifile_in); mat01 = 0; iline = 1; while ischar(sline_in) % Forgive trailing spaces in the file. sline_in = deblank(sline_in); if mod(length(sline_in), num_digits) == 0 while length(sline_in) > 0 % Peel off one number at a time to designate the matrix column. % Note that num should be positive; otherwise MATLAB will give its % standard error message. num = str2num(sline_in(1 : num_digits)); sline_in = sline_in(num_digits + 1 : end); mat01(iline, num) = 1; end sline_in = fgetl(ifile_in); iline = iline + 1; else disp(['*** Error:  Improper format on line ', num2str(iline), '. ***']) sline_in = []; end end % while fclose(ifile_in); if ~isempty(sline_in) disp('The 0/1 matrix was successfully built as "mat01"!') mat01 end