# psi keywords

Wavefunction parameters

## psi.in

To avoid recalculating the wavefunctions, RESCU may load the
wavefunctions obtained during a previous calculation. This is done by
setting psi to the path of a file containing the wavefunctions. The data
should be saved in HDF5 format under the group /waveFunction/psiXXX,
where XXX is the (irreducible) k-point and spin index (kk +
(ss-1)\*nkpt). This may be achieved using the function writeDistArray.
It is not necessary to specify the extension as it is assumed to be .h5.

**type**: `string`

**example**: `psi.in = './results/si_scf.h5'`
