
This function returns the reciprocal of the relative spacing of model numbers with the same kind as X, in the vicinity of X.
If X is not a model number (for example, if X is an IEEE subnormal number), RRSPACING is the value for the nearest model number to X; if X is an IEEE infinity or NaN, the result is a NaN.
For a model number X, this is equal to ABS(SET_EXPONENT(X,DIGITS(X))).
Like many intrinsic functions, this is elemental; the result has the same shape as X, with the operation being applied elementwise.

