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Programming Articles
Page 1153 of 2547
How to add approximately equal sign in a plot using ggplot2 in R?
To add approximately equal sign in a plot using ggplot2, we can use tilde sign twice as ~~ in geom_text function of ggplot2 package. For example, we can do this by using the following syntax geom_text(aes(label="NULL%~~%")). Check out the below example to understand how it works.ExampleConsider the below data frame −x
Read MoreHow to create a list of regression models for predefined vectors in R?
To create a list of regression models for predefined vectors, we can create a blank list and then use the for loop to create the list of regression models. For example, if we have two vectors say x and y, and we want to create a list of regression model between x and y then we create a blank list using list() and perform for loop a particular number of times as shown in the below examples.Example1x
Read MoreC++ program to find n-th term of series 2, 10, 30, 68, 130 ...
In this problem, we are given an integer N. The task is to find the n-th term in series 2, 10, 30, 68, 130...Let’s take an example to understand the problem, InputN = 7Output350ExplanationThe series is 2, 10, 30, 68, 130, 222, 350...Solution ApproachA simple solution to the problem is by finding the general term of the series. Here, the Nth term of the series is N^3 + N. This is found by subtracting the current element with the current index.For i, i = 1, T(1) = 2 = 1 + 1 = 1^3 + 1 i = 2, T(1) ...
Read MoreHow to change the point size in geom_point conditionally in R?
To change the point size in geom_point conditionally, we can define the condition in geom_point with aes and the size using scale_size_manual function of ggplot2 package. For example, if we have a data frame called df that contains two columns say x and y then the scatterplot with different size of points for x values greater than 5 and less than equal to 5 can be drawn by using the below command −ggplot(df, aes(x, y))+geom_point(aes(size=x>5))+scale_size_manual(values=c(4, 7))ExampleConsider the below data frame −x6))+scale_size_manual(values=c(4, 7)) Output
Read MoreC++ program to find n-th term of series 3, 9, 21, 41, 71...
In this problem, we are given an integer N. The task is to find the n-th term in series 3, 9, 21, 41, 71...Let’s take an example to understand the problem, InputN = 7Output169ExplanationThe series is 3, 9, 21, 41, 71, 169...Solution ApproachA simple solution to the problem is by finding the general term of the series. The general term can be found by observing the series a bit. It is, $$T(N) = \sum n^{2} + \sum n + 1$$We can directly use the formula for the sum of square of first n natural numbers, first n natural number and ...
Read MoreHow to find the proportion of each value for a cross tab obtained from a data frame in R?
To find the proportion of each value for a cross tab obtained from a data frame, we can use prop.table function. Suppose we have a data frame called df that contains three columns, two categorical say C1 and C2 and one numerical say Y then the cross tab will be created by using the command xtabs(Y~.,df). Now the proportion of each value can be found by using prop.table(xtabs(Y~.,df),1).Example1Consider the below data frame −f1
Read MoreFind n-variables from n sum equations with one missing in C++
In this problem, we are given an array sum[] consisting of a sum of (n-1) variables given as, Sum[1] = x2 + x3 + x4 + … xn Sum[2] = x1 + x3 + x4 + … xn . . Sum[i] = x2 + x3 + x4 + … x(i-1) + x(i+1) + … + xn . . Sum[n] = x1 + x2 + x3 + … x(n-1) Our task is to find the value of x1, x2, ... xn.Let’s take an example to understand the problem, Inputsum[] = {6, 6, 6, 6, 6, 6, 6}Outputx1 = 1, x2 = ...
Read MoreHow to change default point size of geom_point in R?
To change the default point size of geom_point, we need to use update_geom_defaults function. Specifically, for the change of point size the syntax will be as follows −update_geom_defaults("point",list(size=”value”))Here, we can change the value according to our need.ExampleConsider the below data frame −x
Read MoreFind N'th item in a set formed by sum of two arrays in C++
In this problem, we are given two sorted arrays arr1[] and arr2[] of size m and an element N. Our task is to Find Nth item in a set formed by the sum of two arrays.Code description − Here, we will create a set that consists of the sum of element one of arr1 and one of arr2 i.e. sum = arr1[i] + arr2[j], where are i , j < m. For N, we need to find the value of the Nth element of the set.Let’s take an example to understand the problem, Inputarr1[] = {3, 1, 5} , arr2[] = ...
Read MoreHow to create data frame using nested list elements in R?
To create data frame using nested list elements, we would need to unlist the list elements and store them in a matrix then read as a data frame using data.frame function. For example, if we have a nested called LIST then the data frame can be created by using the command −data.frame(matrix(unlist(LIST),ncol=”No of columns we want”,byrow=F))Check out the below example to understand how it works.ExamplenestedList
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