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Re: Support of log10? (Peng Yu)

From: Peng Yu
Subject: Re: Support of log10? (Peng Yu)
Date: Mon, 16 Aug 2021 10:40:39 -0500

-M is not an option in my case.

On 8/15/21, J Naman <> wrote:
> I think that you may find your answer in
> *Chap 16 Arithmeticand Arbitrary-Precision Arithmetic*, which is a feature
> available only in gawk. The default precision of Float doubles
> is 53 bits (15 decimal places). If that causes you problems for log(10),
> then you have the same problem everywhere in your code that you use
> floating point arithmetic.
> I have used PREC=118 up to 500 bits for testing some algorithms.
> However, you *MUST *use the *Gawk -M command-line option *to use
> the GNU MPFR and GNU MP (GMP) libraries for arbitrary
> precision arithmetic on numbers.
> Two predefined variables, PREC and ROUNDMODE, provide
> control over the working precision and the rounding mode.
> The precision and the rounding mode are set globally for
> every operation to follow.
> See Section 16.4.4 [Setting the Precision], page 374,
> and Section 16.4.5 [Setting the Rounding Mode], page 375,
> for more information.


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