Sorry for dragging a thread in the wrong direction, but ...
> That would indeed be helpful.
If you're looking for a nice example ... this is what happens when you
create a slope with two straight points, then accidentally add a third
point on the same position as the first one:
"
! angle(0,0) is taken as zero.
<for(0)> ...EXPR0)])-angle(thdir((path),(EXPR0))))
mod360;alw_perpendicular:=...
l_slope->...wn.lengths[i]:lengths[i]:=-1;fi;endfor
;ni:=0;pi:=0;for.i=0upto.l...
l.9329 ...(1,51.7368,24.3004),(2,51.7368,24.3004))
;
The `angle' between two identical points is undefined.
I'm zeroing this one. Proceed, with fingers crossed.
...
error -- metapost exit code -- 2
"
That one is really not very human readable (though I can at least see it
was a "slope" at fault).
Tarquin
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