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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).
- sz = sigmoid(z);
- g = sz .* ( 1 .- sz);
- % =============================================================
- end
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