Fmincg
It's a OCTAVE function. It can be helped to calculate the gradient decent.
Example:
options = optimset('GradObj','on','MaxIter',number_of_iterations);
theta = fmincg((@t)cost_function_name(t,X,y),initial_theta, options);
return [ J_value , grad ] and its first parametre should be theta
About debuging
(1)When our algorithm's outcome is not feeling right. We can print the size of the transistion matrix.
