function g = sigmoid(z) %SIGMOID Compute sigmoid function % g = SIGMOID(z) computes the sigmoid of z. % You need to return the following variables correctly g = zeros(size(z)); % ====================== YOUR CODE HERE ====================== % Instructions: Compute the sigmoid of each value of z (z can be a matrix, % vector or scalar). denominator = 1.+exp(-z); g = 1./denominator; % ============================================================= end
吴恩达的机器学习编程作业3:sigmoid 计算s型函数
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