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Reetrant uniform random number generator.

This is a reentrant version of Numerical Recipes rand1() which uses a lookup table to remove low order sequential correlations by shuffling the output. A zeroed randBlock (or just a seed value <= 0) will result in an initialization of the generator.

Returns:

A uniformly distributed random number in (lo, hi).

Parameters:

rb - pointer to random block
lo - low value of uniform distribution
hi - high value of uniform distribution

Author:

MRP, Apr. 1998

See Also:

"Numerical Recipes in C" p. 280 ran1(). and _randBlock