Use element-wise comparisons: .>, .==, etc, and logical indexing,
e.g.:

julia> a = rand(10,10)
10x10 Array{Float64,2}:
...
julia> a[:,a[:,3].>0.5]
10x7 Array{Float64,2}:

On Sat, 2014-01-25 at 11:18, paul analyst wrote:
> As soon as possible: 
> From an array select rows that meet the condition and use them to create a 
> new array? 
> The condition is such col3> 0.5 
> Is loop and gluing the selected rows? Is there a ready command? 
> In other words, a simple filter ...

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