What does ~ mean in an assignment when calling a function?
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Given this line of code to call the function named gradientDescentMulti:
[~, J_history1] = gradientDescentMulti(X, y, theta, alpha, num_iters)
and the defininion of the function as: function [theta, J_history] = gradientDescent(X, y, theta, alpha, num_iters) ,
is the ~ in the assignment matrix just assuming the default assignment for the function?
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Bruno Luong
2019-8-13
[~, J] = ....
mean the first output is ignored by the caller (assigned to a garbage if you like). Even that syntax exists, I often use
[trash, J] = ...
clear trash
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