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diff --git a/R_LogR/mlclass-ex2/sigmoid.m b/R_LogR/mlclass-ex2/sigmoid.m
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+function g = sigmoid(z)
+%SIGMOID Compute sigmoid functoon
+%   J = 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).
+
+
+g = 1 ./ (1 + exp(-z));
+
+
+% =============================================================
+
+end