Metapost now has double precision arithmetic, so one no longer needs to
use the string arithmetic macros. However, it may be necessary to use
scantokens as in
clearxy;
z = (scantokens v1, scantokens v2);
augment.p(x,0);
augment.p(x,y);
x := x + 0.4 ;
augment.p(x,y);
augment.p(x,0);
Alan
On Sat, 6 Jul 2013 22:01:06 -0400
John Kitzmiller <k...@inradius.net> wrote:
> When trying to make a bar graph with m-graph.mkiv and sarith, the
> command Ssub (string subtract) seems to augment.p(v1 Sadd
> "0.4",v2);Sadd instead. An mwe of a bar graph:
>
> (data1 is a separate file containing
> 01 02
> 02 03)
>
> \usemodule[m-graph]
> \startMPpage[instance=graph]
> input sarith;
> draw begingraph(5cm,5cm);
> gdata("data1", v,
> path p;
> augment.p(v1,0);
> augment.p(v1,v2)
> augment.p(v1 Sadd "0.4",v2);
> augment.p(v1 Sadd "0.4",0);
> gfill p--cycle withcolor .8white;
> gdraw p--cycle;
> );
> endgraph;
> \stopMPpage
>
> ...which gives bars of width 0.4 starting at abscissa 1 and 2 as
> expected. To increase the width of the bars to 0.8 and have them
> centered over 1 and 2, I expect to Ssub from the first two augments:
>
> \usemodule[m-graph]
> \startMPpage[instance=graph]
> input sarith;
> draw begingraph(5cm,5cm);
> gdata("data1", v,
> path p;
> augment.p(v1 Ssub "0.4",0);
> augment.p(v1 Ssub "0.4",v2);
> augment.p(v1 Sadd "0.4",v2);
> augment.p(v1 Sadd "0.4",0);
> gfill p--cycle withcolor .8white;
> gdraw p--cycle;
> );
> endgraph;
> \stopMPpage
>
> However, the Ssub adds instead and gives a line at 1.4 and 2.4.
>
> Compiling the above with mpost or mptopdf gives the desired
> result(s), but I am curious if this can be resolved so such bar
> graphs could be made within ConTeXT/METAFUN.
>
> Thanks! John
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