Le decadi 20 nivôse, an CCXXV, Jun Zhao a écrit :
> I didn't find any case about x depends on y or y depends y.

Some users have occasionally asked for it, IIRC.

> If have this dependency relationship , why the code don't handle out_w/out_h 
> in 
> crop?

Ideally, all variables should be able to be expressed based on any
other, and the system should find an order of evaluation that works.
Alas, this is rather complex to implement.

Regards,

-- 
  Nicolas George
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