Subject:
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Re: number notation in official parts
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 10 Mar 2010 22:38:21 GMT
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Viewed:
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22977 times
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In lugnet.cad.dev, Santeri Piippo wrote:
> In lugnet.cad.dev, Michael Heidemann wrote:
> > If I rotate a part in LDDP the result may look like this:
> >
> > 1 16 4E-15 4 -20 0 0 1 0 -1 0 -1 0 0 stud4.dat
> >
> > This can be read by LDView and MLCad as a valid number.
> > Is such notation allowed in official parts? It is nowhere explicit allowed or
> > disallowed. The value 4E-15 is surely very small, but it could also be 4E-2 for
> > example.
> > I just want to know how to deal with such numbers in DATHeader.
> >
> > cu
> > mikeheide
>
> Such notation is not noted in any specs.. neither allowed or forbidden. At
> least, I can't find such. Maybe we should bring this up at LSC at some point?
>
> -Santeri
I think it should be forbidden in official files as the benefit is very small
and it is not good human readable.
Benefit would be smaller filesize, as 0.0004 (6 characters) has more characters
than 4E-4 (4 characters).
Against could be 0.4 (3 characters) to 4E-1 (4 characters).
If we would allow it in this direction why not also in the other direction:
4E1 vs. 40.
So in my eyes the easiest way to deal with this is to forbit this in official
files.
As currently it is not forbidden, DATHeader will do not correct such a notation
if everything else is ok. But if a line is changed in DATHeader it will never be
written with such a notation.
cu
mikeheide
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