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ConvertExpm1 computes exp(x) - 1.
ConvertExpm1(x)
x: a numeric or complex vector
A vector of the same length as 'x' containing the transformed value.
see function expm1 in for more detail descrition.
Becker, R.A., Chambers, J.M. and Wilks, A.R. 1988. The New S Language. Wadsworth and Brooks Cole.