NAG Library Routine Document

X02ALF

X02ALF returns the largest positive floating point number.

X02ALF returns the largest positive number in the model of floating point arithmetic described in the X02 Chapter Introduction. The returned value is equal to $\left(1-b^{-p}\right)\times b^{e_{\max }}$, where $b$ is the arithmetic base (see X02BHF) and $e_{\max }$ is the maximum exponent (see X02BLF) in the model.

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See Section 9 in X02AJF.