Bill Allombert on Sun, 15 Jun 2003 18:58:23 +0200 |
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Re: Sorting multi-dimensional vectors |
On Sun, Jun 15, 2003 at 05:47:16PM +0100, Jon Perry wrote: > I wish to sort a vector, e.g. > > [[1,2],[2,3],[1,3]] > > All the inner vectors are the same length, and the order returned should be; > > [[1,2],[1,3],[2,3]] I suppose this is lexicographic order ? > Is there a routine for this, vecsort() doesn't seem to work. vecsort works fine, you just need to use the flag 2: ? ?vecsort vecsort(x,{k},{flag=0}): sorts the vector of vectors (or matrix) x in ascending order, according to the value of its k-th component if k is not omitted. Binary digits of flag (if present) mean: 1: indirect sorting, return the permutation instead of the permuted vector, 2: sort using lexicographic order, 4: use descending instead of ascending order. ? vecsort([[1,2],[2,3],[1,3]],2) %1 = [[1, 2], [1, 3], [2, 3]] Cheers, Bill.