Setting a trend back to nil

[mykro]

You can try using float32 data type and writing NaN value to your object. Note that it will still show as 0 in the web interface.

Thank you!  I also realised I was attempting to manipulate grp.find results which of course does nothing.  This is what works:

Code:

local function clearObject(name)
  local obj = grp.find(name)
  if ( obj ~= nil ) then
    grp.write(name,0/0)
  end
end

Trend now stops plotting as desired. 

   

Thanks again