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lex_sort
lexicographic matrix rows sorting
Calling Sequence
[N, [k]]=lex_sort(M [,sel] [,'unique'])
Arguments
- M
real matrix
- N
real matrix
- k
column vector of integers
Description
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 equal 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.
See Also
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