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Server Side Programming Articles
Page 1109 of 2109
What is the difference between class and typeof function in R?
The class function in R helps us to understand the type of object, for example the output of class for a data frame is integer and the typeof of the same object is list because data frames are stored as list in the memory but they are represented as a data frame. Check out the below examples with multiple type of objects to understand the differences.Example1x1
Read MoreHow to create transparent bar plot using ggplot2 in R?
To create transparent barplot using ggplot2, we can use alpha argument inside geom_bar function. For example, if we have a data frame called df that contains a categorical column say x and a numerical column say count then the bar plot with transparency can be created by using the command ggplot(df,aes(x,y))+geom_bar(alpha=0.1,stat="identity")ExampleConsider the below data frame −x
Read MoreHow to change the size of dots in dotplot created by using ggplot2 in R?
To change the size of dots in dotplot created by using ggplot2, we can use binwidth argument inside geom_dotplot. For example, if we have a data frame called df that contains a column x for which we want to create the dotplot then the plot with different size of dots can be created by using the command ggplot(df,aes(x))+geom_dotplot(binwidth=2).ExampleConsider the below data frame −x
Read MoreHow to find the opposite of %in% in R?
To find the opposite of %in%, we can use negation operator ! (exclamation sign). For example, if we have a data frame df that contains a column say x then to subset df by excluding some values (say 2, 3) we can use the command subset(df,!(x %in% c(2,3))).Example1Consider the below data frame −x1
Read MoreHow to set the text position using geom_text in R?
To set the text position using geom_text, we can use the value for the X-axis and Y-axis with appropriate positions. We need to make sure that the values we set for both the axes do not lie within the data otherwise the text will be printed on the plot we want to draw and it will become less attractiveExampleConsider the below data frame −x
Read MoreHow to find the index of the nearest smallest number in an R data frame column?
To find the index of the nearest smallest number in an R data frame column, we can use which function along with subsetting for the value for which we want to find the index of the nearest smallest number. To understand how it can be done check out the below examples.Example1Consider the below data frame −ID
Read MoreHow to create a data frame column with letters of both size in R?
To create a data frame column with letters of both sizes, we can simply use the letters function and LETTERS function, the first one corresponds to lowercase letters and the latter corresponds to uppercase letters with single square brackets as shown in the below examples.Example1df1
Read MoreFind Maximum side length of square in a Matrix in C++
In this problem, we are given a 2-D matrix mat[][] of size n, n being an odd number. Our task is to Find Maximum side length of a square in a Matrix.Problem Description − We need to find the length of the square matrix whose perimeter values are the same and it shares the same center as the matrix.Let’s take an example to understand the problem, Inputmat[][] = { {2, 4, 6, 6, 5}, {1, 7, 7, 7, 3}, {5, 7, 0, 7, 1}, {3, 7, 7, 7, 1}, {2, 0, 1, 3, 2} }Output3Solution ...
Read MoreFind Maximum value of abs(i – j) * min(arr[i], arr[j]) in an array arr[] in C++
In this problem, we are given an array arr[] insisting of N integer values.Our task is to Find Maximum value of abs(i – j) * min(arr[i], arr[j]) in an array arr[].Problem description − we need to find the maximum product value of the minimum value of two elements and the absolute differences between their indexes. i.e. for two values i and j, we need to maximise, abs(i - j) * min(arr[i] , arr[j]).Inputarr[] = {5, 7, 3, 6, 4}Output16ExplanationThe maximum value is 16, between index 0 and 4 => abs(0 - 4)*min(arr[0], arr[4]) => 4*min(5, 4) => 4*4 = 16Solution ...
Read MoreFind mean of subarray means in a given array in C++
In this problem, we are given an array arr[] of size n and an integer m. Our task is to Find mean of subarray means in a given array.Code Description − Here, we need to find the mean of array as the mean of means of subarray of size m.Let’s take an example to understand the problem, Inputarr[] = {2, 5, 3, 6, 1}, m = 3Output3.78ExplanationAll subarrays of size m are {2, 5, 3}, {5, 3, 6}, {3, 6, 1} Means of means of subarray of size m, $$(\left(\frac{2+5+3}{3}\right)+\left(\frac{5+3+6}{3}\right)+\left(\frac{3+6+1}{3}\right))/3=\left(\frac{10}{3}\right)+\left(\frac{14}{3}\right)+\left(\frac{10}{3}\right)/3=34/3/3=3.78$$Solution ApproachA simple solution to the problem is by finding all ...
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