Error:attempt to apply non-function
You're missing *s in the last two terms of your expression, so R is interpreting (e.g.) 0.207 (log(DIAM93))^2 as an attempt to call a function named 0.207 ...
For example:
> 1 + 2*(3)[1] 7> 1 + 2 (3)Error: attempt to apply non-function
Your (unreproducible) expression should read:
censusdata_20$AGB93 = WD * exp(-1.239 + 1.980 * log (DIAM93) + 0.207* (log(DIAM93))^2 - 0.0281*(log(DIAM93))^3)Mathematica is the only computer system I know of that allows juxtaposition to be used for multiplication ...
I got the error because of a clumsy typo:
This errors:
knitr::opts_chunk$seet(echo = FALSE)Error: attempt to apply non-function
After correcting the typo, it works:
knitr::opts_chunk$set(echo = FALSE)