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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to create barplot from data frame in R using rows as categories?
If we have small number of rows then we might want to create bar plot for rows instead of using columns as categories. This can be done by using barplot function but we need to convert the data frame to matrix and take the transpose of it. For example, if we have a data frame data_frame with 4 rows and 4 columns, then the barplot with rows as categories can be created as barplot(t(as.matrix(data_frame)),beside=TRUE)Consider the below data frame −Examplex1
Read MoreHow to get value of data attribute and use it in jQuery?
To get value of data attribute, use −$(“yourSelector”).data()The following is our input type with data attribute −ExampleFollowing is the code − Document var value = $('#txtValue').data('value'); console.log("The value is=" + value); OutputThe output is as follows −
Read MoreHow to renumber rows if they are unordered in R?
When we create a sample using inbuilt or imported data set then the numbering for selected rows as in the original data set, therefore, the numbering becomes unordered. To change this unordered numbering to a sequence say starting from one to the total number of rows in the sample, we can use 1:nrow(“sample_object_name”).Consider the below data frame −Exampleset.seed(999) x
Read MoreMatch the style of element while performing paste - jQuery?
For this, use tag. Set it to contenteditable −We have set the following style for paste − pre { min-height: 150px; min-width: 300px; font-family: 'Times New Roman', Times, serif; white-space: pre; background-color: rgb(19, 22, 27); color: #98d8e7; } Now, you can use paste event listener −var getTheData = document.getElementById('data'); getTheData.addEventListener('paste', PutTheDataOnEditor);ExampleFollowing is the code − Document pre { min-height: 150px; min-width: 300px; font-family: 'Times ...
Read MoreCount of only repeated element in a sorted array of consecutive elements in C++
We are given an array of consecutive numbers of length n. The array has only one number which is repeated more than once. The goal is to get the number of times that element is repeated in the array. Or we can say find the length of a repeated element in the array.We will traverse the array from i=0 to i
Read MoreCount of numbers which can be made power of 2 by given operation in C++
We are given an array of positive integers. The goal is to find the count of numbers that can be made power of two by adding 1 to them utmost once.We will check using log2(i) that number is power of two or can become power of two by adding 1 to it. If yes increment count.Let’s understand with examples.Input − arr[]= {1, 3, 2, 5, 6 }, Output − Count of numbers that can become power of 2: 3Explanation − 1+1=2 → 21 , 3+1=4 → 22 , 2=21 others will become 5+1=6, 6+1=7Input − arr[]= {2, 4, 8, 16 ...
Read MoreCount of elements whose absolute difference with the sum of all the other elements is greater than k in C++
We are given an array of integers. The goal is to count numbers such that the absolute difference between the sum of all elements and that element is greater than variable k.We will do this by getting the sum of elements of the array. Now for each element arr[i], check if −sum-2(arr[i])>k, as sum already includes arr[i] so subtract it twice. If true increment count.Let’s understand with examples.Input − arr[]= { 1, 2, 3, 0, 3, 2, 0, 1 }, k=10Output − Count of elements: 2Explanation − Sum of elements is 1212-1-1=10, 12-2-2=8, 12-3-3=6, 12-0-0=12.Only 12 > 10, so for ...
Read MoreFind the minimum number of rectangles left after inserting one into another in C++
Suppose we have width and height of N different rectangles; we have to find the minimum number of rectangles left after inserting one into another. So, if W1 and W2 be the width of rectangles R1 and R2 respectively. And H1 and H2 be the height of R1 and R2 respectively, then if W1 < W2 and H1 < H2 then rectangle R1 fits inside rectangle R2. Thus, the smallest one can fit into second smallest, then that fits into the next and so on.So, if the input is like {{ 30, 45 }, { 15, 15 }, { 45, ...
Read MoreMaximize number of nodes which are not part of any edge in a Graph in C++
We are given a graph containing nodes and edges. The goal is to find the maximum number of possible nodes that are connected to any edge of the graph. We know that no. of nodes will always be less than or equal to the number of edges in a complete graph.We will do this by trying to make a complete graph where the number of nodes is n then there will be n(n-1)/2 edges.edge=n(n-1)/2 (here n for nodes )2*edge=n(n-1). Once n(n-1)> no. of edges then we have extra nodes. So iterate from i=1 to i=n.Till i(i-1)>2*edge. Return n-i as result.Let ...
Read MoreCounting even decimal value substrings in a binary string in C++
We are given with a string of 0’s and 1’s only. The string represents a binary number read from left to right. i.e. 001 is 4 and not 1. The goal is to find all substrings that represent an even decimal number.We will do this by checking the first value of all substrings, if it is 0 then number is even if 1 then number will be odd. Increment count by length-i as all substrings with this sbstr[0]=’0’ will be even in decimal.Let us understand with examples.Input − str=”101”Output − Count of even decimal value substrings in a binary string ...
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