Dear all I only want to find the charge correlation function <n:n> for a 4*2 lattice with 2 particles. as this is not the lowest state it did not come in sparsediag result. fulldiag calculates the whole spectrum which takes much time and i do not need. If there can be any setting of parameter that we calculate "n:n" only for this state. e.g Nup=1 Ndown=1 LATTICE_LIBRARY="/temp/ALPS/xml/lattices.xml" MODEL_LIBRARY="/temp/ALPS/xml/models.xml" MODEL="fermion Hubbard" LATTICE="anisotropic square lattice" L=4 W=2 mu=-0.1 CONSERVED_QUANTUMNUMBERS="Nup,Ndown" MEASURE_CORRELATIONS[charge correlation]="n:n" MEASURE_AVERAGE[Total Particles]="n" U=0 {t=1.0} I need a program that calculate only for one particular state without needing to calculate all the spectrum. I am copying my program for information Best Regards Khalid Loane