A complex matrix for which convergence
counts should be calculated.
xmid, ymid, side, resolution
Alternative specification of
the complex plane Z, where
mean(Re(Z)) == xmid,
mean(Im(Z)) == ymid,
diff(range(Re(Z))) == side,
diff(range(Im(Z))) == side, and
dim(Z) == c(resolution, resolution).
maxIter
Maximum number of iterations per bin.
tau
A threshold; the radius when calling
divergence (Mod(z) > tau).
Value
Returns an integer matrix (of class Mandelbrot) with
non-negative counts.