Error:attempt to apply non-function

Question

I'm trying to run the following code in R, but I'm getting an error.

I'm not sure what part of the formula is incorrect. Any help would be greatly appreciated.

> censusdata_20$AGB93 = WD * exp(-1.239 + 1.980 * log (DIAM93) + 0.207 (log(DIAM93))^2                          - 0.0281 (log(DIAM93))^3) Error: attempt to apply non-function 

Answer 1

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 ...