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Programming Articles
Page 98 of 2544
Convert Tuple to integer in Python
When it is required to convert a tuple into an integer, the lambda function and the 'reduce' function can be used.Anonymous function is a function which is defined without a name. The reduce function takes two parameters- a function and a sequence, where it applies the function to all the elements of the list/sequence. It is present in the 'functools' module.In general, functions in Python are defined using 'def' keyword, but anonymous function is defined with the help of 'lambda' keyword. It takes a single expression, but can take any number of arguments. It uses the expression and returns the ...
Read MoreHow to check if a data frame column contains duplicate values in R?
To check if a data frame column contains duplicate values, we can use duplicated function along with any. For example, if we have a data frame called df that contains a column ID then we can check whether ID contains duplicate values or not by using the command −any(duplicated(df$ID))Example1Consider the below data frame −ID
Read MoreC program to find the sum of arithmetic progression series
ProblemFind the sum of an arithmetic progression series, where the user has to enter first number, total number of elements and the common difference.SolutionArithmetic Progression (A.P.) is a series of numbers in which the difference of any two consecutive numbers is always the same. Here, total number of elements is mentioned as Tn.Sum of A.P. Series: Sn = n/2(2a + (n – 1) d) Tn term of A.P. Series: Tn = a + (n – 1) dAlgorithmRefer an algorithm given below to find the arithmetic progression.Step 1: Declare variables. Step 2: Initialize sum=0 Step 3: Enter first number of series ...
Read MoreInitialize tuples with parameters in Python
When it is required to initialize the tuples with certain parameters, the 'tuple' method and the '*' operator can be used.The 'tuple' method will convert the iterable passed to it as parameter into a tuple class type.The * operator can be used to get the product of two values. It can also be used to multiple a single value multiple times and display it on the console.Below is a demonstration for the same −ExampleN = 6 print("The value of N has been initialized to "+str(N)) default_val = 2 print("The default value has been initialized to " +str(default_val)) indx ...
Read MoreHow to sort each row of an R data frame in increasing order?
To sort each row of an R data frame in increasing order, we can use apply function for sorting the columns and then transpose the output. For example, if we have a data frame called df that contains 5 columns then each row of df can be sorted in increasing order by using the command t(apply(df,1,sort)).Example1Consider the below data frame −x1
Read MoreRemove duplicate tuples from list of tuples in Python
When it is required to remove duplicate tuples from a list of tuples, the loop, the 'any' method and the enumerate method can be used.The 'any' method checks to see if any value in the iterable is True, i.e atleast one single value is True. If yes, it returns 'True', else returns 'False'A list can be used to store heterogeneous values (i.e data of any data type like integer, floating point, strings, and so on).A list of tuple basically contains tuples enclosed in a list.The enumerate method adds a counter to the given iterable, and returns it.Below is a demonstration ...
Read MoreHow to minus one column from another in an R matrix?
To minus one column from another in an R matrix, we first need to read the matrix as a data frame using as.data.frame then find minus the columns using minus sign and accessing the column of the data frame. To understand how it can be done look at the steps in below examples.ExampleConsider the below data frame −M1
Read MoreFind maximum sum taking every Kth element in the array in C++
In this problem, we are given an array arr[] and an integer k. Our task is to Find the maximum sum taking every Kth element in the array.Problem description: We need to find the maximum sum of the elements of the array such that they are k indexes apart. i.e. we need to maximize the sum, sum = arr[i] + arr[i+k] + arr[i + 2*k] + …. arr[i + p*k], such that (i + p*k) < nLet’s take an example to understand the problem, Inputarr[] = {5, 3, −1, 2, 4, −5, 6}, k = 4Output9ExplanationAll sums of every kth ...
Read MoreHow to convert negative values in a matrix to 0 in R?
To convert negative values in a matrix to 0, we can use pmax function. For example, if we have a matrix called M that contains some negative and some positive and zero values then the negative values in M can be converted to 0 by using the command pmax(M,0).ExampleConsider the below data frame −M1
Read MoreFind Maximum value of abs(i – j) * min(arr[i], arr[j]) in an array arr[] in C++
In this problem, we are given an array arr[] insisting of N integer values.Our task is to Find Maximum value of abs(i – j) * min(arr[i], arr[j]) in an array arr[].Problem description − we need to find the maximum product value of the minimum value of two elements and the absolute differences between their indexes. i.e. for two values i and j, we need to maximise, abs(i - j) * min(arr[i] , arr[j]).Inputarr[] = {5, 7, 3, 6, 4}Output16ExplanationThe maximum value is 16, between index 0 and 4 => abs(0 - 4)*min(arr[0], arr[4]) => 4*min(5, 4) => 4*4 = 16Solution ...
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