start with initial value
start with initial value

read a current this->matrix before combined
liangjg/openmc,shikhar413/openmc,paulromano/openmc,liangjg/openmc,walshjon/openmc,walshjon/openmc,mit-crpg/openmc,liangjg/openmc,paulromano/openmc,smharper/openmc,amandalund/openmc,amandalund/openmc,smharper/openmc,shikhar413/openmc,shikhar413/openmc,smharper/openmc,amandalund/openmc,walshjon/openmc,paulromano/openmc,liangjg/openmc,walshjon/openmc,mit-crpg/openmc,shikhar413/openmc,amandalund/openmc,smharper/openmc,paulromano/openmc,mit-crpg/openmc,mit-crpg/openmc