Compute the sigmoid gradient

ex4/sigmoidGradient.m

@@ -12,22 +12,8 @@ g = zeros(size(z));
 % Instructions: Compute the gradient of the sigmoid function evaluated at
 %               each value of z (z can be a matrix, vector or scalar).
 
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+g = sigmoid(z).*(1 - sigmoid(z));
 
 % =============================================================
 
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 end