section z of routines in std.i

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zncen |
                 zncen(ptcen)
              or zncen(ptcen, ireg)

         returns zone centered version of the 2-D point centered array PTCEN.
         The result is (imax-1)-by-(jmax-1) if PTCEN is imax-by-jmax.
         If the region number array IREG is specified, zones with region
         number 0 are not included in the point centering operation.
         Note that IREG should have dimensions imax-by-jmax, like
         the input PTCEN array; the first row and column of IREG are ignored.
         Without IREG, zncen(ptcen) is equivalent to ptcen(zcen,zcen).

    interpreted function, defined at i0/std.i   line 2746
SEE ALSO: | ptcen, uncen