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Programming Articles
Page 1272 of 2547
Count smaller values whose XOR with x is greater than x in C++
We are given an integer number let’s say, x and the task are to count the smaller numbers less than x whose XOR with x will result in a value greater than the XOR value.The truth table for XOR operation is given belowABA XOR B000101011110Input − int x = 11Output − Count of smaller values whose XOR with x is greater than x are − 4Explanation −We are given with the x as 11 which means we need to find XOR of x with the numbers less than x. So the numbers are 1 XOR 11 < 11(FALSE), 2 XOR ...
Read MoreHow to collapse factor levels in an R data frame?
Sometimes the levels of a factor are not correctly recorded, for example, recording male with M in some places and with Mal in some places hence there are two levels for level male. Therefore, the number of levels increases if the factor levels are incorrectly recorded and we need to fix this issue because the analysis using these factor levels will be wrong. To convert the incorrect factor levels into the appropriate ones, we can use list function to define those levels.Example 1F
Read MoreMaximum circular subarray sum in C++
We are given an array and the task is to form the subarrays such that the sum of subarrays in a circular fashion will result in a maximum value.Input − int arr[] = {1, 2, 8, 4, 3, 0, 7}Output − Maximum circular subarray sum is − 22Explanation − we are given an array containing {1, 2, 8, 4, 3, 0, 7} and the subarray of it with maximum sum will be 7 + 1 + 2+ 8 + 4 is 22.Input − int arr[] = { 2, 5, -1, 6, 9, 4, -5 }Output − Maximum circular subarray sum ...
Read MoreHow to extract the p-value and F-statistic from aov output in R?
The analysis of variance technique helps us to identify whether there exists a significant mean difference in more than two variables or not. To detect this difference, we either use F-statistic value or p-value. If the F-statistic value is greater than the critical value of F or if p-value is less than the level of significance then we say that at least one of the means is significantly different from the rest. To extract the p-value and F-statistic value, we can make use of summary function of the ANOVA model.Exampleset.seed(123) Group
Read MoreCount rows/columns with sum equals to diagonal sum in C++
We are given a matrix which is a 2-D array having rows and columns and the task is to calculate the count of sum of all the rows and columns such that it is equal to the sum of either principal or secondary matrix.Input −int arr[row][col] = { { 4, 1, 7 }, { 10, 3, 5 }, { 2, 2, 11} }Output − Count of rows/columns with sum equals to diagonal sum are &mins; 2Explanation −sum of principal diagonal is: 4 + 3 + 11 = 18 and sum of secondary diagonal is: 7 + 3 ...
Read MoreCount number of occurrences (or frequency) in a sorted array in C++
We are given a sorted array of integer type elements and the number let’s say, num and the task is to calculate the count of the number of times the given element num is appearing in an array.Input − int arr[] = {1, 1, 1, 2, 3, 4}, num = 1Output − Count of number of occurrences (or frequency) in a sorted array are − 3Input − int arr[] = {2, 3, 4, 5, 5, 6, -7}, num = 5Output − Count of number of occurrences (or frequency) in a sorted array are − 2Input − int arr[] = {-1, ...
Read MoreHow to create a line chart using ggplot2 with a vertical line in R?
In general, the line chart is drawn to view the trend of something and we might also have some threshold point for that trend, for example, if blood pressure is plotted then we might want to show 60 mm Hg as well because this is the lowest acceptable value for blood pressure recommended by doctors. Therefore, it can be plotted as a vertical line if we want to plot blood pressures of a person. Similarly, there can be many situations where we can use a vertical line to visualize the threshold value. This can be achieved in ggplot2 with the ...
Read MoreCount number of sub-sequences with GCD 1 in C++
We are given an array of integer elements and the task is to find the sub-sequences from the given array which are having GCD as 1. GCD is the greatest common divisor of two or more integers that divides the given numbers entirely and greatest amongst all.Input − int arr[] = {3, 4, 8, 16}Output − Count of number of sub-sequences with GCD 1 are − 7Explanation −The sub-sequences that can be formed from the given array with GCD as 1 are (3, 4), (3, 8), (3, 16), (4, 3), (8, 3), (16, 3), (3, 4, 8)Input − int arr[] ...
Read MoreHow to check if two data frames same or not in R?
Two data frames can be same if the column names, row names and all the values in the data frame are exactly same. We might to check this for data frames that we expect to be same, for example, if we have two data sets each one of have same number of rows, same number of columns, same data type for each of the columns, and the data view shows that values are same then it is worth checking whether the complete data sets are same or not. To do this checking in R, we can use identical function.Examplesdf1
Read MoreHow to initialize a data frame with variable names in R?
There are many ways to initialize a data frame in R but initializing with matrix is the best among them because creating the data frame with matrix help us to avoid entering the wrong number of columns and the wrong number of rows. After initializing the matrix, we can simply use as.data.frame to convert the matrix into a data frame and that’s it.Examplesdf1
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