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Matlab: Process multiple files and combine the results into a cell array.
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function [combination] = batchCombine(funhandle, indir, varargin) | |
%BATCHCOMBINE Process multiple files and combine the results into a cell array | |
% BATCHCOMBINE(FUNC, INDIR) processes every file or directory in | |
% INDIR using processing funtion FUNC. | |
% | |
% FUNC is a function handle that takes source filename as input variables. | |
% For example, if FUNC = @foo, then BATCHCOMBINE calls foo(infile) to | |
% every infile in INDIR. | |
% | |
% BATCHCOMBINE(..., 'para1', value1, 'para2', value2, ...) takes extra | |
% parameter-value pairs to handle input or output options. Parameters are: | |
% | |
% 'InputExtension' -- A string value of input file extensions, for | |
% example, BATCHCOMBINE(@foo, INDIR, 'InputExtension','.jpg') | |
% will only process jpg files in INDIR. | |
% | |
% 'StartWith' -- File to start processing, default is empty. | |
% | |
% 'EndWith' -- File to end processing, default is empty. | |
% | |
% 'Verbose' -- verbose the processing, false by default. | |
% | |
%% checking minimum arguments requried | |
minargs = 2; | |
maxargs = inf; | |
n_exargs = length(varargin); | |
try | |
narginchk(minargs, maxargs); | |
catch err | |
if strcmp(err.identifier,'MATLAB:narginchk:notEnoughInputs') | |
error('batchCombine:notEnoughInputs',... | |
'Not enough inputs, at least %d arguments are needed. Including indir and function handle.',minargs); | |
else | |
rethrow(err); | |
end | |
end | |
%% default parameters | |
opts = struct('inputextension', '',... | |
'startwith', '', 'endwith', '',... | |
'verbose', false); | |
optnames = fieldnames(opts); % case insensitive | |
%% override default parameters | |
if rem(n_exargs,2) % odd number of name/value | |
error('batchCombine:notParameterValuePairs',... | |
'Arguments after first %d should be parameter name/value pairs.',... | |
minargs); | |
end | |
for pair = reshape(varargin,2,[]) | |
inoptname = lower(pair{1}); % making it case insensitive | |
if validatestring(inoptname, optnames) | |
opts.(inoptname) = pair{2}; | |
else | |
error('batchCombine:invalidparameter','%s is not a valid parameter.',... | |
inoptname); | |
end | |
end | |
%% combining | |
sourcefile = dir([indir '/*' opts.inputextension]); | |
if isempty(opts.startwith) | |
startCombining = true; | |
else | |
startCombining = false; | |
end | |
n = 0; | |
total_length = length(sourcefile); | |
tmpCombine = cell(total_length,1); | |
for i = 1:total_length | |
if strcmp(sourcefile(i).name(1),'.') | |
continue; | |
end | |
infile = [indir '/' sourcefile(i).name]; | |
if ~startCombining && any(strfind(infile, opts.startwith)) | |
startCombining = true; | |
end | |
if any(strfind(infile, opts.endwith)) | |
break; | |
end | |
if startCombining | |
if opts.verbose | |
displayString = sprintf('Combining %s.', infile); | |
disp(displayString); | |
end | |
n = n + 1; | |
tmpCombine{n} = funhandle(infile); | |
end | |
end | |
combination = tmpCombine(1:n); | |
end |
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