Personally, I always use your first option:

for i in 1:size(mat, 2)
    # do stuff with mat[:, i]
end

-- John

On Feb 10, 2014, at 6:18 PM, Spencer Russell <s...@mit.edu> wrote:

> for i in 1:size(mat, 2)
>     # do stuff with mat[:, i]
> end
> 

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