setNumberFormat doesn't work on cells?

Not sure why but setNumberFormat with an index and format string of “1000.0” doesn’t seem to work at all. All I want is 1 decimal place for all of the cells within a grid (and the footer if possible), how can I do this? Any examples possibly? The cell types are rotxt, but contain numbers (seemed like the most relevant type of

setMathRound only seems to work on autocalculated columns…

grid.setNumberFormat(“0.0”, column_index)
will cause the necessary effect.

Be sure that column in question has edn or ron type

>>and the footer if possible
Will affect only auto-calculated values in footer.

>> The cell types are rotxt,
Need to be changed to the ron