You didn't come here to make the choice, you've already made it. You're here to try to understand *why* you made it.
You didn't come here to make the choice, you've already made it. You're here to try to understand *why* you made it.
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Tools /
MpLocalExpectationThis tool calculates the local expectation value of an operator <O(i)> for a range of lattice sites. Matrix Product Toolkit version HEAD-0.7.4.0 (subversion tree rev 802) Compiled on Dec 10 2007 at 11:47:35 usage: mp-localexpectation <lattice> <psi> <operator> <first> <last> The operator must be defined in the SiteBlock of the model, and is therefore limited to a local quantity. The 'first' and 'last' indices are raw indices of the n'^th' A-matrix, NOT the coordinates defined by the lattice. This tool is roughly equivalent to running mp-expectation in a loop: for i in `seq $first $last` ; do mp-expectation psi "$operator($i)" ; done but it is much more efficient, requiring only a single sweep to obtain all values. ExamplesTo obtain the local particle density N at each of the first 40 sites of a particle model, use mp-localexpectation lattice psi N 1 40 See also |