How to Sort the Values of the Window?

[RoyiAvital]

I am trying to build something similar to MATLAB's ordfilt2():

function OrderFilter( mI :: Matrix{T}, tuBoxRadius :: Tuple{N, N}, k :: N ) where {T <: AbstractFloat, N <: Integer}
    # Similar to MATLAB's `ordfilt2()`.
    # Should be used with a small radii.

    mK = Kernel{(-tuBoxRadius[1]:tuBoxRadius[1], -tuBoxRadius[2]:tuBoxRadius[2])}(@inline w -> sort(Tuple(w))[k]);
    mO = map(mK, extend(mI[:, :, 1], StaticKernels.ExtensionSymmetric()));
    
    return mO;

end

mI = rand(100, 100);
mO = OrderFilter(mI, (3, 3), 3);

Th issue I get is:

ERROR: MethodError: no method matching sort(::NTuple{49, Float64})

Even if I use (@inline w -> sort(w)[k]); I get:

ERROR: MethodError: no method matching sort(::NTuple{49, Float64})

Any idea how to get through this?

[RoyiAvital]

I ended up doing:

function OrderFilter( mI :: Matrix{T}, tuBoxRadius :: Tuple{N, N}, k :: N ) where {T <: AbstractFloat, N <: Integer}
    # Similar to MATLAB's `ordfilt2()`.
    # Should be used with a small radii.

    numElements = (N(2) * tuBoxRadius[1] + one(N)) * (N(2) * tuBoxRadius[2] + one(N));
    vB = zeros(T, numElements);

    mK = Kernel{(-tuBoxRadius[1]:tuBoxRadius[1], -tuBoxRadius[2]:tuBoxRadius[2])}(@inline w -> (copyto!(vB, Tuple(w)); sort!(vB)[k]));
    mO = map(mK, extend(mI[:, :, 1], StaticKernels.ExtensionSymmetric()));
    
    return mO;

end

I guess it is more efficient as memory is allocated only once.