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Programming Articles
Page 152 of 2544
How to create boxplot for list elements using ggplot2 in R?
If list elements are of equal size having numerical values then the boxplot for each element can be created by using ggplot2 but before creating the boxplot we would need to convert the list to a data frame. The conversion of list elements to a data frame will be done by unlisting of elements and creating two columns, one for categories and one for response variable. Check out the below example to understand how it works.Consider the below list −ExampleList
Read MoreHow to change the default type of points for scatterplot using ggplot2 in R?
To change the defaults for ggplot2 geoms, we need to use update_geom_defaults function. If we want to change the shape of points for scatterplot, we can use the below syntax −update_geom_defaults("point",list(shape=”point_shape_number”))The point shape number ranges from 0 to 25. We can change that according to our need.Consider the below data frame −Examplex
Read MoreHow to extract axes labels for the plot drawn using ggplot2 in R?
When we create a plot using ggplot2, the axes labels are automatically generated for both the axes. We might want to use those axes labels for report writing or some other purpose, therefore, extraction of those labels for a plot created by using ggplot2 package can be found by using the ggplot_build function as shown in the below example but we need to save the plot in an object.Consider the below data frame −Examplex
Read MoreHow floats are stored in C compiler?
In C programming language, float is a short term for floating point.Floating point numbers are generally represented in the form of Institute of Electrical and Electronics Engineers (IEEE) format.The IEEE format uses a sign bit, a mantissa and an exponent for representing the power of 2.The sign bit denotes the sign of the number: a 0 represents a positive value and a 1 denotes a negative value.The mantissa represented in binary after converting into its normalized form. After normalization mantissa, the most significant digit is always 1.The exponent is an integer stored in unsigned binary format after adding a positive ...
Read MoreWhat are the limitations of array in C language?
Arrays are a kind of data structure that can store a fixed-size sequential collection of elements of the same type.An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.LimitationsThe limitations of an array are explained below −An array which is formed will be homogeneous. That is, in an integer array only integer values can be stored, while in a float array only floating value and character array can have only characters. Thus, no array can have values of two data ...
Read MoreHow to create Directories using the File utility methods in Java?
Since Java 7 the File.02s class was introduced this contains (static) methods that operate on files, directories, or other types of files.The createDirectory() method of the Files class accepts the path of the required directory and creates a new directory.ExampleFollowing Java example reads the path and name of the directory to be created, from the user, and creates it.import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.Scanner; public class Test { public static void main(String args[]) throws IOException { System.out.println("Enter the path to create a directory: "); Scanner sc = new Scanner(System.in); ...
Read MoreHow to multiply only one column in an R data frame with a number?
To multiply only one column with a number, we can simply use the multiplication operator * but need to replace the original column with the new values. For example, if we have a data frame called df that contains three columns x1, x2, and x3, and we want to multiply the second column x2 with 2 then it can be done as df$x2
Read MoreHow to create a combination of pairs from a vector in R?
To create a combination of pairs, we can use the combn function. This function will be helpful to use the vector length and the value 2 that represents a pair to create the combinations. Although, this is enough but we can transpose the output to get a better−looking output.Example1x1
Read MoreFind length of Diagonal of Hexagon in C++
In this problem, we are given an integer n denoting the length of the side of a regular hexagon. Our task is to Find length of Diagonal of Hexagon.Problem Description: Here, we have the side of a regular hexagon. And we need to find the length of the diagonal of the hexagon.Let’s take an example to understand the problem, Input: a = 7Output: 12.11Solution ApproachTo solve the problem and find the length of diagonal which is given by the mathematical formula, Diagonal = 1.73 * aLet’s derive the formula, Here, we have a regular polygon of length a.The angle between the diagonal and ...
Read MoreFind length of the largest region in Boolean Matrix in C++
In this problem, we are given a 2-D matrix of size nXm consisting of 0’s and 1’s only. Our task is to find the length of the largest region in the Boolean Matrix. Problem Description: If a cell contains 1, it is a filled Cell. We need to find the length of connected cells which are connected adjacent to each other horizontally or vertically or diagonally. Let’s take an example to understand the problem, Input: matrix[4][5]{ {0, 1, 1, 0, 1}, {0, 0, 1, 1, 1}, {1, 0, 0, 0, 0}, {1, 0, 1, 0, 1} }Output: 6Explanation: The number of connected filled ...
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