Cursera: machine learning ex6.

machine_learning/mlclass-ex6-008/mlclass-ex6/gaussianKernel.m

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+function sim = gaussianKernel(x1, x2, sigma)
+%RBFKERNEL returns a radial basis function kernel between x1 and x2
+%   sim = gaussianKernel(x1, x2) returns a gaussian kernel between x1 and x2
+%   and returns the value in sim
+
+% Ensure that x1 and x2 are column vectors
+x1 = x1(:); x2 = x2(:);
+
+% You need to return the following variables correctly.
+sim = 0;
+
+% ====================== YOUR CODE HERE ======================
+% Instructions: Fill in this function to return the similarity between x1
+%               and x2 computed using a Gaussian kernel with bandwidth
+%               sigma
+%
+%
+
+diff = (x1-x2);
+sim = exp( - diff' * diff / ( 2 * sigma^2))
+
+
+
+
+% =============================================================
+    
+end