发送包含双引号的文本字符串以起作用 [英] Send a text string containing double quotes to function

问题描述

在格式化发送到R中的函数的文本字符串时，我在使用双引号时遇到问题.

I'm having a problem with using double quotes while formatting text strings being sent to functions in R.

考虑示例功能代码:

foo <- function( numarg = 5, textarg = "** Default text **" ){ 
    print (textarg)
    val <- numarg^2 + numarg
    return(val) 
}

当运行以下输入时:

foo( 4, "Learning R is fun!" )

输出为:

[1] "Learning R is fun!"
[1] 20

但是当我尝试时(按照各种建议，

But when I try (in various ways, as suggested here) to write "R" instead of R, I get the following outputs:

> foo( 4, "Learning R is fun!" )
[1] "Learning R is fun!"
[1] 20
> foo( 4, "Learning "R" is fun!" )
Error: unexpected symbol in "funfun( 4, "Learning "R"
> foo( 4, "Learning \"R\" is fun!" )
[1] "Learning \"R\" is fun!"
[1] 20
> foo( 4, 'Learning "R" is fun!' )
[1] "Learning \"R\" is fun!"
[1] 20

按照建议在此处似乎破坏了功能.

Using as.character(...) or dQuote(...) as suggested here seems to break the function because of different number of arguments.

推荐答案

您可以尝试以下方法:

foo <- function(numarg = 5, textarg = "** Default text **" ){ 
    cat(c(textarg, "\n")) 
    val <- (numarg^2) + numarg
    return(val) 
}

foo <- function(numarg = 5, textarg = "** Default text **" ){ 
    print(noquote(textarg)) 
    val <- (numarg^2) + numarg
    return(val) 
}

foo( 4, "Learning R is fun!" )
foo( 4, 'Learning "R" is fun!' )

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