thrownan — eliminates nan values
[nonan,numb]=thrownan(x)
This function returns in vector nonan the values
(ignoring the NANs) of a vector or matrix x and
in the corresponding places of vector numb the
indexes of the value.
For a vector or matrix x,
[nonan,numb]=thrownan(x) considers x,
whatever his dimensions are, like a vector (columns
first).
In Labostat, NAN values stand for missing values in tables.