One of the way could be:
fid = fopen('data.dat','r'); % Open File to read
replaceline = 'act= 1,0,8,-2'; % Line to replace
i = 1;
tline = 's';
A = {[]};
while ischar(tline)
tline = fgetl(fid);
if ~isempty(strfind(tline,'@controls')) % find '@controls'
A{i}=tline;
A{i+1} = replaceline; % replace line
tline = fgetl(fid);
i = i+1;
else
A{i}=tline;
end
i = i+1;
end
fclose(fid);
fid2=fopen('data.dat','w'); % Open file to write
for i=1:length(A)-1
fprintf(fid2,['%s',char([13,10])],A{i});
end
fclose(fid2);
Let me know if you have doubts !
