math function for a vector

2016 7 8
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I'm working with Matlab R2012a. I have a simple question and I know there must be a simple answer, but searching and playing around with the syntax hasn't worked.
function sig = sigmoid( x)
sig = 1/(1+exp(-x));
end
This function works in Octave as is, but in Matlab it only works with scalars. What is the syntax for this function when x is a vector or matrix and I need this applied element wise? I tried the "." notation to no avail. I know I can loop through all the elements of x, but is there a more elegant way?

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Azzi Abdelmalek
Azzi Abdelmalek 2016-7-8
编辑：Azzi Abdelmalek 2016-7-8

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function sig = sigmoid( x)
sig = 1./(1+exp(-x));

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