F06QJF permutes the rows or columns of a real rectangular matrix using an integer array of permutations.
F06QJF performs one of the permutation operations
where
B is a real matrix, and
P is a permutation matrix.
P is represented in the form
where
Pi,j is the permutation matrix that interchanges items
i and
j; that is,
Pi,j is the unit matrix with rows and columns
i and
j interchanged. If
i=j,
Pi,j=I.
This routine requires the indices
pi to be supplied in an integer array;
F06QKF performs the same operation with the indices supplied in a real array.
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