dirRecurse.m

function files = dirRecurse( folder )

directories = dir( folder );
directories = directories( [directories.isdir] );

files = arrayfun( @(S) S.name , dir( fullfile( folder , '*.m' ) ) , 'UniformOutput' , false );

for d = 1:numel(directories)
    if ~strcmp( directories(d).name(1), '.' )
        files = cat(1, files , dirRecurse( fullfile( folder , directories(d).name ) ) );
    end
end