Question

I see a function passing like

sigma = 3*e-2
svmTrain(...,@(X,y)gaussianKernel(X,y,sigma),...);

What is going on with such a function passing, would someone explain ?

Answer 1

The syntax @(X,y) gaussianKernel(X, y, sigma) creates an anonymous function by binding the third argument of this existing function guassianKernel(X, y, s) to specifically be the value sigma.

If you inspect the svmTrain function signature, you’ll see that it allows passing in a function, which is where this anonymous function is going.