Home › Forums › Bug Reports › Reflection coefficient functions are missing in the display Tagged: rtoy, rtoz, stoy, stoz This topic has 1 reply, 2 voices, and was last updated 2 hours, 4 minutes ago by SM6PGP. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 17. March 2026 at 0:42 #9237 sggParticipant Attempting to use any of the reflection coefficient function (rtoz, rtoy, etc.) in the display generates an “ERROR: Unknown function ‘<funcName>’. This is uSimmics 5.9. Attachments:missing_reflection_coeff_functions.png 17. March 2026 at 9:52 #9239 SM6PGPParticipant Look in the uSimmics 5.9 help file for available mathematical functions. use stoz(S,Z) stoy(S,Z) /Hannes Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.