Re: R-alpha: Single precision vs double

Paul Gilbert (pgilbert@bank-banque-canada.ca)
Wed, 3 Apr 1996 11:29:56 -0500


Date: Wed, 3 Apr 1996 11:29:56 -0500
From: pgilbert@bank-banque-canada.ca (Paul Gilbert)
To: R-testers@stat.math.ethz.ch
Subject: Re: R-alpha: Single precision vs double
Message-Id: <96Apr3.112533est.29461@mailgate.bank-banque-canada.ca>



My understanding is that both single and double precision operations
are the same number of hardware instructions on any machine with IEEE
floating point hardware (ie. anything but an old 386 with no math
coprocessor). Of course, this doesn't account for IO, so bus width will
make a difference.  One of the great conveniences of languages like S
is to not frequently get messed up by poor single precision
arithematic. There are lots of examples where SP arithematic on SP
numbers is not adequate. Please don't implement SP arithematic.

Paul
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