Am 2. Februar 2020 20:52:14 MEZ schrieb "Csaba Láng" <langcsaba at gmail.com>: >thank you gentlemen, this is what I needed. never figured out that atan >is >arctn. in general, you might prefer `atan2` over `atan`, as this allows for all four quadrants. `[expr]` has both variants. mfg.hft.fsl IOhannes