[metapost] [metafont] Intersection not found

[Dirk Laurie]

2012/9/2 luigi scarso <luigi.scarso at gmail.com>:

> delta:=0.0;
> W:= (98.7548,641.79626+delta) .. controls (90.11118,641.79578) and
> (81.92762,638.4686) .. (76.0048,632.54578) ;
> Z:= (136.89632643855,644.96996896103) .. controls
> (123.53464210923,642.829621773) and (109.9003277095,641.79626) ..
> (96.2548,641.79626) ;

> I'm a bit surprised because I thought that    (96.2548,641.79626)  of Z was
> part of W.

You have two points with the same y coordinate.

(98.7548,641.79626)
(96.2548,641.79626)

They can't both be on the graph of the same strictly monotone function.