# Question: Which Function Is Very Similar To Lapply?

## Is proprietary tool for predictive analytics?

__________ is proprietary tool for predictive analytics.

Explanation: SAS (Statistical Analysis System) is a software suite developed by SAS Institute for advanced analytics.

Explanation: Descriptive is the simplest class of analytics..

## Is pandas apply faster than for loop?

apply is not generally faster than iteration over the axis. I believe underneath the hood it is merely a loop over the axis, except you are incurring the overhead of a function call each time in this case.

## How do you make a loop faster in R?

Use apply family of functions instead of for-loops Using apply() function to compute the same logic and comparing it against the vectorised for-loop. The results again is faster in order of magnitudes but slower than ifelse() and the version where condition checking was done outside the loop.

## What is a list in R?

Lists are the R objects which contain elements of different types like − numbers, strings, vectors and another list inside it. A list can also contain a matrix or a function as its elements. List is created using list() function.

## Which of the following is a multivariate version of Lapply?

Which of the following is multivariate version of lapply? Explanation: The mapply() function is a multivariate apply of sorts which applies a function in parallel over a set of arguments. 5.

## What is margin in Apply R?

MARGIN is a variable defining how the function is applied: when MARGIN=1 , it applies over rows, whereas with MARGIN=2 , it works over columns. Note that when you use the construct MARGIN=c(1,2) , it applies to both rows and columns; and. FUN , which is the function that you want to apply to the data.

## What is r in mathematical functions?

How to Use Mathematical Functions in RFunctionWhat It Doesabs(x)Takes the absolute value of xlog(x,base=y)Takes the logarithm of x with base y; if base is not specified, returns the natural logarithmexp(x)Returns the exponential of xsqrt(x)Returns the square root of x2 more rows

## Which function is same as Lapply () in R?

sapply() function It is useful for operations on list objects and returns a list object of same length of original set. sapply() function does the same job as lapply() function but returns a vector.

## What package is Lapply in R?

laply is a function in Hadley’s “plyr” package. The convention is that the first letter refers to the input class and the second letter refers to the output class so laply takes a list and returns an array.

## Why does Sapply return a list?

The real reason for this is that sapply doesn’t know what your function will return without calling it. In your case the function returns a logical , but since sapply is given an empty list, the function is never called. Therefore, it has to come up with a type and it defaults to list .

## How do you use reduce in R?

Reduce() Reduce() reduces a vector, x , to a single value by recursively calling a function, f , two arguments at a time. It combines the first two elements with f , then combines the result of that call with the third element, and so on. Calling Reduce(f, 1:3) is equivalent to f(f(1, 2), 3) .

## Are for loops slow in R?

4 Answers. Loops in R are slow for the same reason any interpreted language is slow: every operation carries around a lot of extra baggage. Look at R_execClosure in eval. c (this is the function called to call a user-defined function).

## How does Lapply work in R?

lapply function is applied for operations on list objects and returns a list object of same length of original set. lapply function in R, returns a list of the same length as input list object, each element of which is the result of applying FUN to the corresponding element of list.

## What is difference between Lapply and Sapply?

If the programmers want the output to be a data frame or a vector, then sapply function is used whereas if a programmer wants the output to be a list then lapply is used. There is one more function known as vapply which is preferred over sapply, as vapply allows the programmer to specify the output type.

## What does tapply mean in R?

tapply in R. Apply a function to each cell of a ragged array, that is to each (non-empty) group of values given by a unique combination of the levels of certain factors. Basically, tapply() applies a function or operation on subset of the vector broken down by a given factor variable.

## What is the max function in R?

max returns the position of the element with the maximal value in a vector.

## 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. And here is a vector of logical values.

## What is Mapply?

mapply is a multivariate version of sapply . mapply applies FUN to the first elements of each … argument, the second elements, the third elements, and so on. Arguments are recycled if necessary.

## Is Lapply faster than for loop?

The apply functions (apply, sapply, lapply etc.) are marginally faster than a regular for loop, but still do their looping in R, rather than dropping down to the lower level of C code. … Essentially, this means calling a function that runs its loops in C rather than R code.

## What is Lapply and Sapply in R?

lapply returns a list of the same length as X , each element of which is the result of applying FUN to the corresponding element of X . sapply is a user-friendly version and wrapper of lapply by default returning a vector, matrix or, if simplify = “array” , an array if appropriate, by applying simplify2array() .

## Is used to apply a function over subsets of a vector?

tapply() is used to apply a function over subsets of a vector.