Please forgive me for jumping into the discussion: what is the syntax precisely?
Is this feature implemented in all the applications?
I've tried using
MEASURE_CORRELATIONS[SzSz,INITIAL_SITE=0]="Sz:Sz"
with dmrg, and it gave me same N*(N-1)/2 values.
Best,
  Zhenya

Synge Todo wrote: 
From: Fu-Jiun Jiang ITP <fjjiang@itp.unibe.ch>
Date: Thu, 22 Jan 2009 13:08:53 +0100 (CET)
  
    Thanks for the quick response. This is exactly what I thought
(and did). However to my surprise, the output file of " ladder " is
so large (compared to the usual square lattices), it is impossible
to " firefox " or " convert2tex " the " *.tast1.out.xml " file! Any
suggestion will be appreciated!
    

Since your lattice does not have translational symmetry any more, all
the combinations of two sites (N*(N-1)/2) will be measured and stored
independently.  If you are interested in the correlation function from
a specific site (say the boundary site), you can specify parameter
INITIAL_SITE to its index (e.g INITIAL_SITE = 0), which greatly
reduces the output size from O(N^2) to O(N).

Synge