24 lines
701 B
Matlab
24 lines
701 B
Matlab
function g = sigmoidGradient(z)
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%SIGMOIDGRADIENT returns the gradient of the sigmoid function
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%evaluated at z
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% g = SIGMOIDGRADIENT(z) computes the gradient of the sigmoid function
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% evaluated at z. This should work regardless if z is a matrix or a
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% vector. In particular, if z is a vector or matrix, you should return
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% the gradient for each element.
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g = zeros(size(z));
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% ====================== YOUR CODE HERE ======================
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% Instructions: Compute the gradient of the sigmoid function evaluated at
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% each value of z (z can be a matrix, vector or scalar).
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e = exp(-1*z);
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g = e ./ ((e+1).^2);
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% =============================================================
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end
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