What you essentially need to do is concatenate strings (and convert the number into a string). Let's say you want to test the vector c = [ 12 16 20 ] and g = [ 2 3 4 ](one at a time).
You can then create your option-string directly as:
for i = 1:length(c)
opt = [ '-c ' num2str(c(i)) ' -g ' num2str(g(i)) ];
% now call svmtrain
end
or use sprintf
for i = 1:length(c)
opt = sprintf('-c %i -g %i',c(i),g(i));
% now call svmtrain
end
For me, the second option is more readable, especially if you have a lot of options.
Cheers
