section z of routines in global.i

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# 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 ```