> -----Original Message-----
> From: John Haddy [mailto:[EMAIL PROTECTED]]
> Sent: 01 August 2002 16:31
> To: Protel EDA Forum
> Subject: Re: [PEDA] OT Metric vs Imperial
> 
> If the base units are metric then there will be NO rounding errors in
> conversion!
> e.g. if the base unit is one micron then 0.1 thou = 2540 base units
> EXACTLY - there's
> no error introduced.
> 
> However, if the base unit is english (no matter how fine), 
> there is no error
> free
> conversion to metric, unless the system uses fractions 
> instead of floating
> point numbers!
> 
> e.g. if base unit = 0.1 micro-inch then 0.1mm = 
> 3.93700787402... base units
> 
> So there's a very strong case to require a hard metric base unit.

John

I agree, both systems can be supported properly if Protel wished to. That was my point.

But I prefer to be a little more gracious to the users who prefer to work in Imp units 
by not forcing metric upon them.

> I don't care whether the design is entered in imperial or 
> metric, but I do
> very much
> care when a component doesn't stay where I put it due to 
> rounding errors!

Ah, so you have moved the origin about sometimes as well?

I agree also.

Best Regards

John A. Ross

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