Home Manual Packages Global Index Keywords Quick Reference | # all functions - z
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
zoom_factor |
                 zoom_factor, factor

         sets the zoom factor for mouse-click zoom in and zoom out operations.
         The default FACTOR is 1.5; FACTOR should always be greater than 1.0.

    builtin function, documented at i0/graph.i   line 786
SEE ALSO: | limits, range, unzoom, plg
zroots |
                 zroots(a)

         returns the vector of (complex) roots of the (complex)
         polynomial: Sum(a(i)*x^(i-1)) using Laguerre's method.
         The roots are sorted in order of increasing real parts.  Call with
         non-zero imsort keyword to sort into increasing imaginary parts.
         See Numerical Recipes (Press, et. al., Cambridge Univ. Press 1988),
         section 9.5.

    interpreted function, defined at i/zroots.i   line 10