I just hope that Julia can be faster than Java someday...
On Sunday, April 27, 2014 2:03:28 PM UTC+8, Freddy Chua wrote: > > This code takes 60+ secs to execute on my machine. The Java equivalent > takes only 0.2 secs!!! Please tell me how to optimise the following > code.begin > > begin > N = 10000 > K = 100 > rate = 1e-2 > ITERATIONS = 1 > > # generate y > y = rand(N) > > # generate x > x = rand(K, N) > > # generate w > w = zeros(Float64, K) > > tic() > for i=1:ITERATIONS > for n=1:N > y_hat = 0.0 > for k=1:K > y_hat += w[k] * x[k,n] > end > > for k=1:K > w[k] += rate * (y[n] - y_hat) * x[k,n] > end > end > end > toc() > end > > Sorry for repeated posting, I did so to properly indent the code.. >
