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Johnson system random numbers   r = johnsrnd(quantiles,m,n) r =
johnsrnd(quantiles) [r,type] = johnsrnd(...) [r,type,coefs] =
johnsrnd(...)   r = johnsrnd(quantiles,m,n) returns an m-by-n
matrix of random numbers drawn from the distribution in the
Johnson system that satisfies the quantile specification given
by quantiles. quantiles is a four-element vector of quantiles
for the desired distribution that correspond to the standard
normal quantiles [–1.5 –0.5 0.5 1.5]. In other words, you
specify a distribution from which to draw random values by
designating quantiles that correspond to the cumulative
probabilities [0.067 0.309 0.691 0.933]. quantiles may also be a
2-by-4 matrix whose first row contains four standard normal
quantiles, and whose second row contains the corresponding
quantiles of the desired distribution. The standard normal
quantiles must be spaced evenly.      Note:   Because r is a
random sample, its sample quantiles typically diff