Write field name and value form structures to a file - matlab

Question

I am wondering how can I write a full structure in an output file *.txt with all fieldnames and the respectives values. For example
allvariables=
names='raw.txt'
date= = '**/**/2013'
User = Mr/Mrs *
timeProcessing = 20
numberIterations = 1000;
Should be written in output.txt with all the information displayed before.
This is just an example but my structure has a length of 50 fieldnames, so I would appreciate any suggestion!

Answer 1

Here's something you can use:
%// Extract field data
fields = fieldnames(allvariables);
values = struct2cell(allvariables);
%// Optional: add enclosing apostrophes around string values
idx = cellfun(#ischar, values);
values(idx) = cellfun(#(x){['''', x, '''']}, values(idx));
%// Convert numerical values to strings
idx = cellfun(#isnumeric, values);
values(idx) = cellfun(#num2str, values(idx), 'UniformOutput', false);
%// Convert cell arrays of strings to comma-delimited strings
idx = cellfun(#iscellstr, values);
stringify_cellstr = #(x){['{' sprintf('''%s'', ', x{1:end - 1}) ...
sprintf('''%s''', x{end}) '}']};
values(idx) = cellfun(stringify_cellstr, values(idx));
%// Convert cell array of numbers to strings
idx = cellfun(#iscell, values);
isnumber = #(x)isnumeric(x) && isscalar(x);
idx_num = cellfun(#(x)all(arrayfun(#(k)isnumber(x{k}),1:numel(x))), values(idx));
idx(idx) = idx_num;
stringify_cellnum = #(x){['{' sprintf('%d, ' x{1:end - 1}) num2str(x{end}) '}']};
values(idx) = cellfun(stringify_cellnum, values(idx));
%// Combine field names and values in the same array
C = {fields{:}; values{:}};
%// Write fields to text file
fid = fopen('output.txt', 'wt');
fprintf(fid, repmat('%s = %s\n', 1, size(C, 2)), C{:});
fclose(fid);
This solution is essentially a variant of this one. Note that it assumes that each field contains a scalar value or a string, but it can be extended to handle other types, of course.
EDIT: added handling for fields storing cell arrays of strings and cell arrays of numbers.