Compute the sigmoid function

ex2/sigmoid.m

@@ -2,14 +2,14 @@ function g = sigmoid(z)
 %SIGMOID Compute sigmoid functoon
 %   J = SIGMOID(z) computes the sigmoid of z.
 
-% You need to return the following variables correctly 
+% 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));