SimpleScriptExample

#!/bin/bash

# check that we have the correct number of parameters

if [ $# -ne 2 ] ; then
   echo "error: expected 2 parameters <L> <Sz>"
   exit 1
fi

L=$1
Sz=$2

# Some other parameters we will not need to vary often
states=20
sweeps=10

# construct the lattice

# filename of the lattice
LatticeFile="lattice-$L"

# does the lattice exist already?
if [ -f $LatticeFile ] ; then
   echo "Lattice file already exists"
else
   echo "Constructing lattice file $LatticeFile ..."
   spinchain-u1 -L $L -o $LatticeFile
fi

# construct an initial state
WaveFile="psi-$L-$Sz"
echo "Constructing initial state $WaveFile ..."
mp-random -l $LatticeFile -q $Sz -o $WaveFile

# run the dmrg program
mp-dmrg -H $LatticeFile:"H" -w $WaveFile  -m $states -s $sweeps