Tools /
## MpInfoOldThe Matrix Product Toolkit version HEAD-0.7.4.0 (subversion tree rev 802) Compiled on Dec 10 2007 at 11:40:24 usage: mp-info [options] input-wavefunction Allowed options: --help show this help message -e [ --entropy ] show the entropy at each partition -s [ --states ] show the number of states at each partition -d [ --density-matrix ] show the density matrix eigenvalues -c [ --casimir ] show the values of the casimir invariant operators at each partition -l [ --limit ] arg limit the density matrix display to N eigenvalues (implies --density-matrix) -b [ --localbasis ] Show the local basis at each site -2 [ --base2 ] show the entropy using base 2 instead of base e With no options, ## ExamplesTo see basic information about a wavefunction: `mp-info wavefunction`
prints: Symmetry list is N:U(1),Sz:U(1) State transforms as 20,0 Number of sites = 30 To see the number of states kept at each bond, use `mp-info -s wavefunction`
prints: #bond #dimension #degree 0 1 1 1 50 176 2 50 202 3 100 488 4 100 508 5 100 496 6 100 517 ... Similarly for the entropy ( The The ## NotesListing the number of states is very fast, because it doesn't require any computation. Obtaining the entropy, density matrix or expectation values of the casimir invariants requires the equivalent of a sweep, because the density matrix must be obtained at each partition. |

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