In this blog, we are going to provide you a top R Interview Questions and Answers. Links are also provided along with the questions to the deep understanding of the topic. Hope this blog will help you a lot to crack R Interview. Explain What is R?
Various ways to iterate over sequences The sequence functions illustrated in 4. We can randomize the contents of a list s before iterating over them, using random.
We can convert between these sequence types. For example, tuple s converts any kind of sequence into a tuple, and list s converts any kind of sequence into a list. We can convert a list of strings to a single string using the join function, e. Some other objects, such as a FreqDist, can be converted into a sequence using list or sorted and support iteration, e.
We can omit the parentheses because the comma has higher precedence than assignment. It is equivalent to the following traditional way of doing such tasks that does not use tuples notice that this method needs a temporary variable tmp.
There are also functions that modify the structure of a sequence and which can be handy for language processing. Thus, zip takes the items of two or more sequences and "zips" them together into a single list of tuples.
Given a sequence s, enumerate s returns pairs consisting of an index and the item at that index.
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For some NLP tasks it is necessary to cut up a sequence into two or more parts. To do this we decide the location where we want to cut the datathen cut the sequence at that location.
We can also verify that the ratio of the sizes of the two pieces is what we intended. A simple string is actually an object with methods defined on it such as split. We use a list comprehension to build a list of tupleswhere each tuple consists of a number the word length and the word, e.
We use the sort method to sort the list in-place. Finally, we discard the length information and join the words back into a single string. The underscore is just a regular Python variable, but we can use underscore by convention to indicate that we will not use its value.
We began by talking about the commonalities in these sequence types, but the above code illustrates important differences in their roles. First, strings appear at the beginning and the end: Lists and tuples are used in the middle, but for different purposes.
A list is typically a sequence of objects all having the same type, of arbitrary length. We often use lists to hold sequences of words. In contrast, a tuple is typically a collection of objects of different types, of fixed length.
We often use a tuple to hold a record, a collection of different fields relating to some entity. This distinction between the use of lists and tuples takes some getting used to, so here is another example: An individual entry is represented as a tuple because it is a collection of objects with different interpretations, such as the orthographic form, the part of speech, and the pronunciations represented in the SAMPA computer-readable phonetic alphabet http: Note that these pronunciations are stored using a list.
Note A good way to decide when to use tuples vs lists is to ask whether the interpretation of an item depends on its position. For example, a tagged token combines two strings having different interpretation, and we choose to interpret the first item as the token and the second item as the tag.
Thus we use tuples like this: In contrast, the elements of a text are all tokens, and position is not significant. Thus we use lists like this: The linguistic meaning of the words might be different, but the interpretation of list items as tokens is unchanged.
The distinction between lists and tuples has been described in terms of usage. However, there is a more fundamental difference: In other words, lists can be modified, while tuples cannot.In mathematics, the Bernoulli numbers B n are a sequence of rational numbers which occur frequently in number rutadeltambor.com values of the first 20 Bernoulli numbers are given in the table to the right.
For every even n other than 0, B n is negative if n is divisible by 4 and positive otherwise. For every odd n other than 1, B n = The superscript ± used . Apr 09, · If the value on the stack, n, is greater than 1, then we need to start computing the factorial. Multiply n, by what's in the accumulator, store the result back into the accumulator, decrement n and repeat (except for initializing the accumulator).
THE DETAILS Let's assume that the function was called thusly, "factorial 5". Number game: Number game, any of various puzzles and games that involve aspects of mathematics. Mathematical recreations comprise puzzles and games that vary from naive amusements to sophisticated problems, some of which have never been solved.
They may involve arithmetic, algebra, geometry, theory of numbers. Reverse a Number in C++ Program Code Fahad Munir dry run c++ program to reverse a number, reverse number code 26 comments A simple C++ program in which user enter a number, program reverse it and display reversed number on the console.
We can write this program very simply within the main function but our main aim is to get started to use Classes and Objects. In the program below, We are using defining a class with name Factorial. The Tau Manifesto is dedicated to one of the most important numbers in mathematics, perhaps the most important: the circle constant relating the circumference of a circle to its linear dimension.
For millennia, the circle has been considered the most perfect of shapes, and the circle constant captures the geometry of the circle in a single number.