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[mathcad] Re: Rounding up/down error
| [mathcad] Re: Rounding up/down error |
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Author: Pergande, Albert N
Posted: Thu, 17 Jul 2003 08:30:24 -0400
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That would be an analog computer, preferable made from 6AU6 based op
amps.
-----Original Message-----
From: Belshan, James (E52) />
Sent: Wednesday, July 16, 2003 5:40 PM
To: Mathcad Discussion List
Subject: [mathcad] Re: Rounding up/down error
> Having said that, it does seem somewhat unfortunate that the
> convention used in MathCAD is somewhat obscure ...
Not to nit-pick, but this seems to be a little bit of a mis-statement.
To
my understanding, MathCAD is programmed in a computer language, probably
C++. The programming language has a variety of variable types
available,
which adhere to the IEEE standards. This is where you get the "round to
the
even number" rule. MathCAD is not free to make its own rounding rules
at
this level.
C++ (or whatever language it's written in) is not even to blame, really.
Since the computer uses binary, there are only certain numbers that it
can
represent exactly (1/2, 1/4, 1/8, etc). So it may be that the closest
number it can store to 0.55 (for example only) is either 0.54999 or
0.55002,
leading to "anomalous" results.
What we need is for someone to invent a transistor with 10 states so we
could do normal "human" math.
James
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