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all functions  z
zncen

zncen(ptcen)
or zncen(ptcen, ireg)
returns zone centered version of the 2D point centered array PTCEN.
The result is (imax1)by(jmax1) if PTCEN is imaxbyjmax.
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 imaxbyjmax, 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 mouseclick 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^(i1)) using Laguerre's method.
The roots are sorted in order of increasing real parts. Call with
nonzero 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

