lex_sort — lexicographic matrix rows sorting
[N, [k]]=lex_sort(M [,sel] [,'unique'])
the lex_sort
function is now obsolete. It can be replaced by functions gsort and
unique.
N=lex_sort(M)
sorts the rows (as a group) of the matrix M
in ascending order. If required the output argument k
contains
the ordering: [N,k]=lex_sort(M)
returns k
such as N
is
uequal to M(k,:)
.
N=lex_sort(M,sel [,'unique'])
produces the same result as the
following sequence of instructions:
[N,k]=lex_sort(M(:,sel) [,'unique']); N=M(k,:)
The 'unique'
flag has to be given if one wants to retain only
unique rows in the result. Note that lex_sort(M,sel,'unique')
retains only rows such that M(:,sel) are unique.