Greetings! I am a new Julia user and have the following issue. I am writing code to calculate a knn spatial weight matrix to estimate a spatial econometric model. Using the MATLAB code from Jim LeSage's Econometrics Toolbox, I converted that code into Julia as follows:
xc = rand(8); yc = rand(8); n = length(xc); k = 2; distance = zeros(n); nnlist = zeros(n,k); tempw = zeros(n,n); for i=1:n; xi = xc[i,1]; yi = yc[i,1]; distance = (xc - xi*ones(n)).^2 + (yc - yi*ones(n)).^2 temp = sortperm(distance) nnlist[i,1:k] = temp[2:k+1,1]'; end for i=1:n tempw[i,nnlist[i,:]] = 1; end W = tempw/k; This is a "toy" example and I was wondering if I can use the Distance package to simplify the distance = (xc - xi*ones(n)).^2 + (yc - yi*ones(n)).^2 formula. I tried using the pairwise option like so: R = pairwise(Euclidean(),xc,yc) but received the following message: R = pairwise(Euclidean(),xc,yc) MethodError(pairwise,(Euclidean(),[0.05961066617957589,0.018538084399339905,0.39282193332224646,0.7006919213133509,0.5099836895629475,0.8448415935222402,0.2985674570217043,0.8022287058003177],[0.5808687231553928,0.9655167324458858,0.026306556019434435,0.6565373244339141,0.11927452074471412,0.11873635450496622,0.6271632933770979,0.7081439899673692])) I'd like to be able to utilize the Distance package but am a bit stumped. The code as written works but it's bugging me that I cannot seem to get the above command to work. I also get the following error when loading Distance: using Distance Warning: could not import Base.foldl into NumericExtensions Warning: could not import Base.foldr into NumericExtensions Warning: could not import Base.sum! into NumericExtensions Warning: could not import Base.maximum! into NumericExtensions Warning: could not import Base.minimum! into NumericExtensions If there is anyone who can address this I'd greatly appreciate it. Incidentally, the help on this group is one reason I am making the change. Don