[PCB_FORUM] Re: Metric to English - English to Metric
- From: "richard moffat" <richard.moffat@xxxxxxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Thu, 25 Aug 2005 09:14:46 +1200
Cadence is probably making a compromise for speed. The way that other tools
may allow a seemless interchange is to have a greater length of significant
numbers in the internal database, especially converting metric->imperial.
The programmers are restricted to that they are given: The C compiler, and the
maths processor on the CPU.
In short: don't convert!
>>> austin@xxxxxxxxxxxx 25/08/2005 9:08:15 a.m. >>>
Hi,
> Conversely, 1/10 (0.1) cannot be exactly represented in base 2...
I design ASICs, and I have done a LOT of arithmetic functions in ASICs, and
use decimal points all the time. All hardware arithmetic functions are done
in base 2. It's simply a matter of knowing where the decimal point is and
using enough digits. Yet, it goes on to explain the solution (as I said,
knowing where the decimal point is)...so I fail to see the *real* problem.
As was pointed out, PADS has no problem switching back and forth between the
two unit systems, so I simply don't believe Allegro can't do it as well. It
seems like this may be a self imposed restriction:
> The real issue is that some numbers can't be represented exactly in the
> standard floating point representation.
Why do they have to use "standard" floating point representation anyway?
Sounds like someone programmed themselves into a corner, and instead fixing
it, they are trying to come up with explanations...instead of solutions.
Sigh. To me, this is a huge weakness of Allegro.
Regards,
Austin
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