R; 使用操纵函数并获取：（函数（x）中的错误：未使用的参数（envir = <environment> ）

Question

I intend to use manipulate :

    install.packages("UsingR")
    library(manipulate)
    library(UsingR)

    data(galton)

    ########## Manipulable Histogram ##########

    myHist <- function(mu, Color){
    hist(galton$child, col=Color, breaks=10)
    lines(c(mu,mu), c(0, 150), col="red", lwd=5)
    }

    manipulate(myHist(mu, Color), mu = slider(62, 74, step=.5),
    Color=picker("blue", "red", initial="blue"))

I always get this error while using manipulate:

Error in (function (x) : unused argument (envir = )

I do not see any issue in the code above. I have NO IDEA of why I get this error. My R session is clean and new.

I am using R3.2 64 bits through R Studio Version 0.99.441 . Any idea of the missing settings ?

Answer 1

通过将Rstudio中的“ R”目录设置为文件夹win-library所在的默认工作目录，找到了答案。