You're trying to loop over two different things at once. Much simpler:
filepath = 'c:\somewhere\somefile.extension';
filecontent = fileread(filepath); %read the whole file at once rather than line by line
for paramvalue = 10:16
filecontent = strrep(filecontent, ['param',num2str(paramvalue)], num2str(values(paramvalue))); %replace each parameter
end
%write the file back:
fid = fopen(filepath, 'w');
fwrite(filecontent);
fclose(fid);
filepath = 'c:\somewhere\somefile.extension';
filecontent = fileread(filepath);
%replace param10 - param16 at once with values(10)- values(16):
filecontent = regexprep(filecontent, 'param(1[0-6])', '${num2str(values(str2double($1)))}');
%... save file
