demean

Syntax

demean(X)

Arguments

X is a numeric scalar/vector/matrix/table.

Details

Center a dataset (zero-centering), and return an object of type DOUBLE with the same dimension as X. NULL values are ignored in the calculation.

If X is a vector, calculate X - avg(X);
If X is a matrix, perform calculations by columns;
If X is a table, perform calculations only for numeric columns.

Examples


    $ x = 1 NULL 2 3
    $ demean(x)
    [-1,,0,1]

    $ v = 1 0 1 1 8 2 -4 0
    $ demean(v)
    [-0.125,-1.125,-0.125,-0.125,6.875,0.875,-5.125,-1.125]