On Mon, 15 Oct 2012 12:27:27 +0200
Alan BRASLAU <alan.bras...@cea.fr> wrote:
> On Mon, 15 Oct 2012 12:08:30 +0200
> Sietse Brouwer <sbbrou...@gmail.com> wrote:
>
> > > There is a bug with format() as redefined in m-graph.mkiv
> > > 1e10 and 1e-10 truncate the tailing 0.
> >
> > The function strip() is removing 0 throughout the exponent, and I
> > don't know what purpose that might serve. If we never want to remove
> > zeroes, this works:
> >
> > local function strip(s)
> > - return "\\times10^{"..(s:gsub("%+*0*","")).."}"
> > + return "\\times10^{"..(s:gsub("%+*","")).."}"
> > end
> >
> > Note that if the exponent is zero the "× 10^0" will be left out
> > completely, in both the old and the new strip() function. This seems
> > to be by design. Illustration of this behaviour:
> >
> > \usemodule[graph]
> > \starttext
> > \startMPpage
> > label(format("@g","1e+0"),(2cm,-1cm)) ;
> > \stopMPpage
> > \stoptext
>
>
> Thanks, this "fixes" it for now,
> but I believe that the strip is intended to remove leading zeros, as
> in label(format("@g","1e+08"),(2cm,-1cm)) ;
>
> I suppose that the correct syntax must be something like the regex
> s/[+-]*0*\([1-9]\)/\1/
> (not sure how to state this in lua gsub()...)
Figured it out (and we don't want to strip a leading minus sign):
local function strip(s)
return "\\times10^{"..(s:gsub("%+*0*([1-9])","%1")).."}"
end
Alan
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