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Articles by Nizamuddin Siddiqui
Page 52 of 196
How to find all unique triplets that adds up to sum Zero using C#?
The easy approach is that we could create three nested loops and check one by one that the sum of all the three elements is zero or not. If the sum of the three elements is zero then print elements.Time Complexity − O(n3)Space Complexity − O(1)We could use an unordered set data structure to store each value of the array. Set provides the benefit of searching an element in O(1) time. So, for each pair in the array, we will look for the negative of their sum that might exist in the set. If such an element is found then ...
Read MoreHow to search in a row wise increased matrix using C#?
The primitive solution for this problem is to scan all elements stored in the input matrix to search for the given key. This linear search approach costs O(MN) time if the size of the matrix is MxN.The matrix needs to be scanned from the top right, if the search element is greater than the top right element then increments the row or else decrement the column. The below piece of code develops a function SearchRowwiseIncrementedMatrix that takes a two-dimensional array and search key as input and returns either true or false depending upon the success or failure of search key ...
Read MoreHow to search in a row wise and column wise increased matrix using C#?
The primitive solution for this problem is to scan all elements stored in the input matrix to search for the given key. This linear search approach costs O(MN) time if the size of the matrix is MxN.The matrix can be viewed as a sorted one-dimensional array. If all rows in the input matrix are concatenated in top-down order, it forms a sorted one-dimensional array. And, in that case binary search algorithm is suitable for this 2D array. The below piece of code develops a function SearchRowwiseColumnWiseMatrix that takes a two-dimensional array and search key as input and returns either true ...
Read MoreHow to check whether the given matrix is a Toeplitz matrix using C#?
A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same elements.Example 1[[1, 2, 3, 4], [5, 1, 2, 3], [9, 5, 1, 2]]Output −trueIn the above grid, the diagonals are −"[9]", "[5, 5]", "[1, 1, 1]", "[2, 2, 2]", "[3, 3]", "[4]".In each diagonal all elements are the same, so the answer is True.Example 2Input: matrix [[1, 2], [2, 2]]Output −falseThe diagonal "[1, 2]" has different elementsCodepublic class Matrix { public bool ToeplitzMatrix(int[, ] mat) { int row = getMatrixRowSize(mat); int col = getMatrixColSize(mat); ...
Read MoreHow to display NA frequency for a ggplot2 graph using color brewer in R?
To display NA frequency for a ggplot2 graph using color brewer in R, we can follow the below steps −First of all, create a data frame.Then, create the chart with default colors.After that, use scale_colour_brewer function to create the bar chart and set the color of NA values bar with na.value.Create the data frameLet's create a data frame as shown below − Live DemoGroup
Read MoreHow to create the bar chart with ggplot2 using color brewer in R?
To create the bar chart with ggplot2 using color brewer in R, we can follow the below steps −First of all, create a data frame.Then, create the chart with default colors.After that, use scale_colour_brewer function to create the bar chart.Create the data frameLet's create a data frame as shown below − Live DemoGroup
Read MoreHow to subset an R data frame with condition based on only one value from categorical column?
To subset an R data frame with condition based on only one value from categorical column, we can follow the below steps −First of all, create a data frame.Then, subset the data frame with condition using filter function of dplyr package.Create the data frameLet's create a data frame as shown below − Live DemoClass
Read MoreHow to find the groupwise correlation matrix for an R data frame?
To create groupwise correlation matrix for an R data frame, we can follow the below steps −First of all, create a data frame.Then, find the correlation matrix by splitting the data frame based on categorical column.Create the data frameLet's create a data frame as shown below − Live Demov1
Read MoreHow to create a correlation matrix by a categorical column in data.table object in R?
To create a correlation matrix by a categorical column in data.table object in R, we can follow the below steps −First of all, create a data.table object.Then, find the correlation matrix by splitting the object based on categorical column.Create the data.table objectLoading data.table package and creating a data.table object −library(data.table) x
Read MoreHow to create the combination of rows in two data frames having same columns in R?
To create the combination of rows in two data frames having same columns in R, we can follow the below steps −First of all, create two data frames.Then, combine the rows in the data frames with expand.grid and cbind with do.call.Create the data framesLet's create a data frame as shown below − Live DemoClass
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