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What does the '@' symbol do in this equation?
Is the first (z) multiplied the e^(...)?
% Gaussian kernel function kerf=@(z)exp(-z.*z/2)/sqrt(2*pi);
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It is a function handle. It means that you are defining an anonymous function 'kerf' that takes z as an input. The actual equation is just
The User Guide has a pretty good write-up about these. Search "anonymous function" in the Help.