a

Question

a <- 3Lb <- 3*a + 7 typeof(b)
what is the output you will see at the console?
[Fill in the blank]

BlackTom AI · Accepted Answer

In this question, we’re evaluating a small snippet that assigns values and then asks about the console output for a type check.
Option by option, here’s the breakdown: 
First, understanding the code structure: a <- 3; b <- 3*a + 7; typeof(b). In R, numeric literals like 3 are of type double by default, and the operation 3*a + 7 with a being 3 yields b = 3*3 + 7 = 16. The key question is what typeof(b) returns, and how R prints that result.
Option 1: "\"double\"". This corresponds to the quoted string double, which is exactly how R represents the result of typeof(...) when printed. In R, typeof(b) returns the string "double", and printing that value yields [1] "double". So the console output would include the quotes around double, indicating it is a character vector of length 1 containing the word double.
Option 2: double (without quotes). If you were just thinking about the literal word without considering R’s printing convention, you might write double as the bare word. However, in R, the result of typeof(...) is a character string, and when shown in the console it is printed with quotes. Therefore, simply writing double would not match the actual printed representation of the console output for typeof(b).
To further break down the potential confusion: some learners expect the type name to appear as a plain token, but R’s typeof returns a string value like "double". The console’s typical display mirrors that by showing [1] "double" with the quotation marks, signaling a character vector containing the text double.
In summary, the correct way to fill the blank that matches how R prints the result is the first option: "\"double\"". The second option, double, would be incorrect with respect to the exact console representation, though conceptually it refers to the same type name.

COMM_V 205 101 102 103 2025W1 R Review Quiz

a <- 3Lb <- 3*a + 7 typeof(b) what is the output you will see at the console? [Fill in the blank]

查看解析

登录即可查看完整答案

类似问题

Question at position 1 str and float are examples offunctionspackagesdata typesdata structuresoperators

___________ data type in C# can hold collection of characters.

What type of value is returned by the expression ord("A")?

Once price_CAN column was successfully created as above, you run the following code. iphone$price_CAN[ 2 ] <- as.character(iphone$price_CAN[ 2 ])typeof(iphone$price_CAN) What is the output? [Fill in the blank]

a <- 3L b <- 3*a + 7 d <- a>btypeof(d) What is the output at the console? [Fill in the blank]

w <- TRUE x <- 3 y <- 3L z <- "3M" The data types of the objects created above are: 1: w 2: x 3: y 4: z

Identify the data type of the following literal: EasyFrame

Identify the data type of the following literal: 'goalkeeper'

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单