错误:尝试应用不起作用 [英] Error:attempt to apply non-function

问题描述

我正在尝试在R中运行以下代码，但出现错误.

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

我不确定公式的哪一部分不正确.任何帮助将不胜感激.

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

推荐答案

表达式的后两项缺少 * ，因此R正在解释(例如) 0.207(log(DIAM93))^ 2 作为调用名为 0.207 ...

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 ...

例如:

> 1 + 2*(3)
[1] 7
> 1 + 2 (3)

错误:尝试应用无效功能

Error: attempt to apply non-function

您的(不可复制的)表达应为:

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是我所知道的唯一允许并置用于乘法的计算机系统...

Mathematica is the only computer system I know of that allows juxtaposition to be used for multiplication ...

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