[metapost] Units unaccuracy with numbersystem set to double
franck.pastor at mac.com
Wed Apr 2 15:07:07 CEST 2014
Le 2 avr. 2014 à 12:25, Akira Kakuto <kakuto at fuk.kindai.ac.jp> a écrit :
>> Maybe this problem has been solved in this last version.
> MetaPost 1.900 shows
> *show cm;
Thus the same value, in fact…
> Note that MetaPost does not calculate it from an exact formula.
> It simply prints the value defined in plain.mp: cm=28.34645;
Indeed, I knew this already. My point is that I'm surprised that these values have not already been replaced in plain.mp by more accurate ones, as
cm = 28.3464566929134;
mm = 2.83464566929134;
pt = 0.99626400996264;
and so on.
If "numbersystem" is set to double, MetaPost would make use of these more accurate values appropriately. If "numbersystem" is set to "scaled", I suppose they would be automatically rounded to their ancient values. As it happens in the examples I've made for myself. For example, if I run the following program with the default number system (scaled):
cm = 28.3464566929134; show cm;
So, there would be no harm whatsoever in introducing more accurate values in plain.mp for the usual units. Or at least it seems so. Maybe I'm wrong in this?
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