Hi ALPS-
I've been playing around with ALPS diagonalization procedures in the tutorials and seem to have run across a bug in the measurement behavior. If you add the following measurement to parm1a in ed-01-sparsediag (and appropriately convert the input file to xml):
MEASURE_AVERAGE[Avg Sx] = Sx
Then sparsediag dies with a parsing error:
$ sparsediag parm1a.in.xml ALPS sparse diagonalization application version 1.1 available from http://alps.comp-phys.org/ copyright (c) 2003-2007 by Matthias Troyer troyer@comp-phys.org for details see the publication: A.F. Albuquerque et al., J. of Magn. and Magn. Materials 310, 1187 (2007).
using the ALPS parallelizing scheduler copyright (c) 1994-2006 by Matthias Troyer troyer@comp-phys.org. see Lecture Notes in Computer Science, Vol. 1505, p. 191 (1998).
based on the ALPS libraries version 2.0.2-r5790 available from http://alps.comp-phys.org/ copyright (c) 1994-2011 by the ALPS collaboration. Consult the web page for license details. For details see the publication: B. Bauer et al., J. Stat. Mech. (2011) P05001.
parsing task files ... Starting task 1. Quantumnumber Sz going from -4 to 4 with increment 1 Did not parse to end of string '(Sx)/4(i)'
I couldn't figure out any way to measure an average single site operator (rather than a correlation) because of this issue.
Best, Chris