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ex4/sigmoidGradient.m

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+function g = sigmoidGradient(z)
+%SIGMOIDGRADIENT returns the gradient of the sigmoid function
+%evaluated at z
+%   g = SIGMOIDGRADIENT(z) computes the gradient of the sigmoid function
+%   evaluated at z. This should work regardless if z is a matrix or a
+%   vector. In particular, if z is a vector or matrix, you should return
+%   the gradient for each element.
+
+g = zeros(size(z));
+
+% ====================== YOUR CODE HERE ======================
+% 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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+% =============================================================
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+end