check real(norm) is positive

issp-center-dev / TeNeS

Massively parallel tensor network solver

http://www.pasums.issp.u-tokyo.ac.jp/tenes/en

GNU General Public License v3.0

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Closed yomichi closed 3 years ago

yomichi commented 3 years ago

(related to #40) Check (real part of) the calculated norm is positive or not.