[英]How to make function argument an element from the vector in R?
I have a vector of non-numeric elements:我有一个非数字元素的向量:
all_z <- c("red","yellow","blue")
And I am trying to make a function that requires argument z to be one of the elements in the vector.我正在尝试创建一个函数,该函数需要参数 z 作为向量中的元素之一。 The function has two other arguments: n (is.numeric = FALSE), and y (is.numeric = TRUE).
该函数还有另外两个参数:n (is.numeric = FALSE) 和 y (is.numeric = TRUE)。
arguments n and y result in output1 and output2;参数 n 和 y 导致 output1 和 output2; z results in output3.
z 导致输出 3。 Currently my code looks like this (verb and noun are previously defined vectors):
目前我的代码看起来像这样(动词和名词是以前定义的向量):
byColor <- function(n,y,z) {
if ((is.numeric(n) == FALSE) && (is.numeric(y) == TRUE)){
output1 <- sample(verb, 1, replace = FALSE)
output2 <- sample(noun, 1)
}
}
My question is: how do I make it so that output3 occurs only if argument z is an element from the vector all_z?我的问题是:如何使 output3 仅在参数 z 是向量 all_z 中的元素时才发生? My end goal is stringing all three outputs together, but only if all three of these arguments are satisfied.
我的最终目标是将所有三个输出串在一起,但前提是这三个参数都得到满足。 Is there a way to add the z argument into my "if" statement?
有没有办法将 z 参数添加到我的“if”语句中? Currently I can get the output that I want, but it works for any non-numerical argument as z and not just elements of the vector.
目前我可以获得我想要的输出,但它适用于任何非数字参数作为 z 而不仅仅是向量的元素。 I'm hoping that I've written this clearly;
我希望我已经写清楚了; please let me know if I should elaborate further.
请让我知道我是否应该进一步详细说明。 Thank you!
谢谢!
If you want to know if a certain value is contained somewhere in a vector, you can use the %in%
function.如果您想知道某个值是否包含在某个向量中,您可以使用
%in%
函数。 Assuming all_z
is already defined, you can use something like this.假设
all_z
已经定义,你可以使用这样的东西。
byColor <- function(n, y, z) {
if ((is.numeric(n) == FALSE) &&
(is.numeric(y) == TRUE) &&
(z %in% all_z)) {
output1 <- sample(verb, 1, replace = FALSE)
output2 <- sample(noun, 1)
output3 <- NULL
}
}
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