The function allows to choose between resolution 53 and 32 bits.
The resolution is the number of random bits in the numbers
Numeric, 53 or 32. The required number of bits.
The new setting of the resolution is valid for the next calls to
Generating a random number with the resolution 53 requires two iterations
of the internal 32 bit generator and
their outputs are combined to a single number. The slow down of 53 bit
resolution compared to 32 bit resolution is about 20 percent, since
an R call to
runif() performs also other actions besides calling
the internal generator and these actions are run only once.
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