On Sat, 28 Nov 2009, Curiouslearn wrote:
Hi,
Is it possible to truncate the digits after decimal point in Metapost
when using textext()? Please see the minimal example below which
produces 1.84375. Can I just keep the first digit and have it produce
1.8 ?
Thanks.
If you are using mkiv, you can use lua to truncate a number.
\unexpanded\def\truncate#1{\ctxlua{context("\%.1f", #1)}}
\startMPdefinitions
def truncatedtext(expr s) =
textext("\truncate{" & s & "}")
enddef ;
\stopMPdefinitions
\starttext
\startuseMPgraphic{Figure}
u := 1cm;
pickup pencircle scaled 2pt; % default pen thickness
%TheFunction
vardef f(expr x) =
(10/x)-x*((0.5)**x)
enddef;
%Labels
%label.lft(textext("\truncate{" & decimal f(5) & "}"),(0,f(5)) scaled u);
label.lft(truncatedtext(decimal f(5)),(0,f(5)) scaled u);
\stopuseMPgraphic
\useMPgraphic{Figure}
\stoptext
Aditya
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