Podcast
Questions and Answers
What command is used to remove all objects from the workspace in R?
What command is used to remove all objects from the workspace in R?
- clear_workspace()
- rm(list=ls(all=TRUE)) (correct)
- delete(all=TRUE)
- clean(list=ls())
Which function can be used to find the mean of a numeric vector while ignoring NA values?
Which function can be used to find the mean of a numeric vector while ignoring NA values?
- mean(y, na.rm = FALSE)
- mean(y, na.rm = TRUE) (correct)
- average(y, na.rm = TRUE)
- mean(y, ignore_na = TRUE)
How to create a matrix from two vectors in R?
How to create a matrix from two vectors in R?
- rbind(y,z) (correct)
- combine(y, z)
- cbind(y,z)
- matrix(y, z)
What is the purpose of the command 'setwd()' in R?
What is the purpose of the command 'setwd()' in R?
What is the correct way to load a saved workspace from a file in R?
What is the correct way to load a saved workspace from a file in R?
Which command accurately retrieves the dimensions of a dataframe in R?
Which command accurately retrieves the dimensions of a dataframe in R?
How can you calculate the average lifespan of a Nobel Laureate while excluding NAs?
How can you calculate the average lifespan of a Nobel Laureate while excluding NAs?
Which command is incorrect for creating a new dataframe from existing data in R?
Which command is incorrect for creating a new dataframe from existing data in R?
Flashcards
R
R
A programming language and software environment for statistical computing and graphics.
ls()
ls()
Lists objects in the current R environment.
rm(list=ls())
rm(list=ls())
Removes all objects from the R environment.
getwd()
getwd()
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setwd()
setwd()
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save.image()
save.image()
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load()
load()
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x <- 1
x <- 1
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class(x)
class(x)
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c()
c()
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rbind()
rbind()
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cbind()
cbind()
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mean()
mean()
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NA
NA
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read.table()
read.table()
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data frame
data frame
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dim()
dim()
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head()
head()
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tail()
tail()
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subset()
subset()
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is.na()
is.na()
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nobel$age_discovery
nobel$age_discovery
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