normalize
projects a vector or matrix onto the
probability simplex.
If all entries (per row or column) get thresholded to
0 (since they are all negative to start with), then
it sets the position of the maximum of x
to
1 and leaves all other entries at 0.
1 
x 
a numeric matrix(like object). 
byrow 
logical; if 
tol 
a tolerance level to set values < tol to
0 (after an initial normalization). Default:

If x
is a vector it returns the thresholded vector
(see threshold
) and normalized by its sum.
If x
is a matrix it works by column of by row
(argument byrow
).
threshold
1 2 3 4 5 
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