The angle between two identical points. Odesláno z iPhonu 15. 4. 2019 v 19:35, Tarquin Wilton-Jones via Therion <therion@speleo.sk>:
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).
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