What is Rep command?
Description. Use the rep (
repeat while equal
), repnz (repeat while nonzero) or repz (repeat while zero) prefixes in conjunction with string operations. Each prefix causes the associated string instruction to repeat until the count register (CX) or the zero flag (ZF) matches a tested condition.
How do you create a vector rep?
There are two methods to create a vector with repeated values in R but both of them have different approaches, first one is by
repeating each element of the vector and the second repeats the elements by a specified number of times
. Both of these methods use rep function to create the vectors.
What is the c () in R?
The c() is
a built-in R generic function that combines its arguments
. The c() in R is used to create a vector with explicitly providing values. The default method combines its arguments to form a vector. All arguments are coerced to a common type of the returned value, and all attributes except names are removed.
What is dim () in R?
dim() function in R Language is
used to get or set the dimension of the specified matrix, array or data frame
. Syntax: dim(x) Parameters: x: array, matrix or data frame.
How do you append in R?
- Syntax: append(x, values)
- Parameters:
- x: represents a vector to which values has to be appended to.
- values: represents the values which has to be appended in the vector.
How do you repeat in R?
Repeat Function in R:
The Repeat Function(loop) in R executes a same block of code iteratively until a stop condition is met
. repeat loop in R, is similar to while and for loop, it will execute a block of commands repeatedly till break.
What does Na in R mean?
In R, missing values are represented by the symbol NA (
not available
). Impossible values (e.g., dividing by zero) are represented by the symbol NaN (not a number). Unlike SAS, R uses the same symbol for character and numeric data.
What is length R?
length() function in R Programming Language is
used to get or set the length of a vector (list) or other objects
.
What is the Times argument in R?
The help file (for rep ) says the following about the times argument: an integer-valued vector giving the (non-negative) number of times to repeat each element if of length length(x) , or to repeat the whole vector if of length 1. Negative or NA values are an error.
What is a vector in R?
A vector is
the simplest type of data structure in R
. Simply put, a vector is a sequence of data elements of the same basic type. Members of a vector are called Components. Here is a vector containing three numeric values 2, 3 and 5 : c(2, 3, 5) [1] 2 3 5 Copy. And here is a vector of logical values.
What is unlist in R?
unlist() function in R Language is
used to convert a list to vector
. It simplifies to produce a vector by preserving all components.
What does %>% mean in R studio?
%>% is called the
forward pipe operator
in R. It provides a mechanism for chaining commands with a new forward-pipe operator, %>%. This operator will forward a value, or the result of an expression, into the next function call/expression.
What is a loop in R?
In R programming, we require a control structure to run a block of code multiple times. Loops come in the class of the most fundamental and strong programming concepts. A loop is
a control statement that allows multiple executions of a statement or a set of statements
. The word ‘looping’ means cycling or iterating.
What does str () do in R?
str() function in R Language is used for
compactly displaying the internal structure of a R object
. It can display even the internal structure of large lists which are nested. It provides one liner output for the basic R objects letting the user know about the object and its constituents.
What does head () do in R?
head() function in R Language is used to
get the first parts of a vector, matrix, table, data frame or function
.
What is dim Python?
VB variables can be defined or dimensioned using the Dim keyword to
specify their type and/or size (for arrays)
. Python has no equivalent of the Dim statement but the converted code attempts to match the semantics of the Dim by, Initializing the named variables to an empty object of the required type.
Is there a dictionary in R?
Overview.
Dict is a R package which implements a key-value dictionary data structure based on R6 class
. It is designed to be similar usages with other languages’ dictionary implementations (e.g. Python). R’s vector and list , of course can have names, so you can get and set value by a name (key) like a dictionary.
Does R index 0 or 1?
In R,
the indexing begins from 1
. While NA and zero values are allowed as indexes, rows of an index matrix containing a zero are ignored, whereas rows containing an NA produce an NA in the result.
How do you create a Dataframe in R?
To combine a number of vectors into a data frame, you simply
add all vectors as arguments to the data. frame() function, separated by commas
. R will create a data frame with the variables that are named the same as the vectors used.
How do lists work in R?
R list is the object which contains elements of different types – like strings, numbers, vectors and another list inside it. R list can also contain a matrix or a function as its elements.
The list is created using the list() function in R
. In other words, a list is a generic vector containing other objects.
How do you make an infinite loop in R?
A repeat loop is used to iterate over a block of code multiple number of times. There is no condition check in repeat loop to exit the loop. We must ourselves
put a condition explicitly inside the body of the loop and use the break statement to exit the loop
. Failing to do so will result into an infinite loop.
What does next do in R?
Next statement in R is used to
skip any remaining statements in the loop and continue the execution of the program
. In other words, it is a statement that skips the current iteration without loop termination. ‘next’ is a loop control statement just like the break statement.
