r - Error:attempt to apply non-function -


i'm trying run following code in r, i'm getting error.

i'm not sure part of formula incorrect. appreciated.

> censusdata_20$agb93 = wd * exp(-1.239 + 1.980 * log (diam93) + 0.207 (log(diam93))^2                          - 0.0281 (log(diam93))^3) error: attempt apply non-function

you're missing *s in last 2 terms of expression, r interpreting (e.g.) 0.207 (log(diam93))^2 attempt call function named 0.207 ...

for example:

> 1 + 2*(3) [1] 7 > 1 + 2 (3) error: attempt 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 computer system know of allows juxtaposition used multiplication ...


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