thank you
On Wed, Sep 7, 2016 at 12:03 PM, Mosè Giordano <mose.giord...@gmail.com>
wrote:
> Hi Ahmed,
>
>
> Hello,
>> l have a matrix as follow :
>> k=rand(1:100,3,3)
>> 3x3 Array{Int64,2}:
>> 97 26 77
>> 58 64 86
>> 87 85 99
>>
>>
>> l want to shuffle randomly the order by lines for instance line 1 becomes
>> 3. l have a matrix of 10000 by 700 .
>>
>
> The following function is based on the definition of shuffle! in Julia
> 0.4 (it's different in Julia 0.5)
>
> function shufflerows!{T<:Real}(a::AbstractArray{T})
> for i = size(a, 1):-1:2
> j = rand(1:i)
> a[i,:], a[j,:] = a[j,:], a[i,:]
> end
> return a
> end
>
> Here is it in action:
>
> julia> a = rand(1:100, 5, 3)
> 5x3 Array{Int64,2}:
> 18 90 34
> 9 24 61
> 49 73 84
> 70 85 20
> 66 59 37
>
> julia> shufflerows!(a)
> 5x3 Array{Int64,2}:
> 9 24 61
> 18 90 34
> 70 85 20
> 49 73 84
> 66 59 37
>
> Note that the matrix is changed in-place.
>
> Cheers,
> Mosè
>
