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Page 1266 of 2109
How to display mean inside boxplot created by using boxplot function in R?
A boxplot shows the median as a measure of center along with other values but we might want to compare the means as well. Therefore, showing mean with a point is likely to be preferred if we want to compare many boxplots. This can be done by using points(mean(“Vector_name”)), if we are plotting the columns of an R data frame then we will reference them instead of vector name.ExampleConsider the below data and the boxplot −x
Read MoreCount number of ordered pairs with Even and Odd Sums in C++
We are given an array of n positive numbers.The goal is to count the ordered pairs (arr[x], arr[y]) with the sum of arr[x] and arr[y] is even or odd. Pair ( arr[i], arr[j] ) and ( arr[j], arr[i] are counted as separate.We will traverse the array using two for loops for each number of pairs. Now calculate sum, if it is even increment count by 2 for even sums else increment count by 2 for odd sums.Let’s understand with examples.Input− Arr[]= { 1, 1, 2, 3 } N=4Output− Count of even product sums − 6 Count of odd sum pairs ...
Read MoreHow to find the number of values in a column of an R data frame that are not zero?
If an R data frame has numerical columns then it is also possible that there exist zeros in few or all columns and we might be interested in finding the number of non-zero values in a column. This will help us to compare the columns based on the number on non-zero values and it can be done by using colSums.ExampleConsider the below data frame −x1
Read MoreCount number of substrings with numeric value greater than X in C++
We are given a string of numbers 0 to 9. The string represents a decimal number. The goal is to find all substrings that represent a decimal number which is greater than number X. Condition is that substring should not start with 0. I.e in “2021”, “02”, “021”. “0” will not be included.We will do this by checking the first value of all substrings, if it is greater than 0 then start making substrings from that index by converting them into integers using stoi(). If substring>X increment count.Let us understand with examples.Input − str=”123” X=12Output − Count of number of ...
Read MoreHow to change the scale of Y-axis if the histogram bars are higher than the axis size in R?
When we create a histogram using hist function in R, often the Y-axis labels are smaller than the one or more bars of the histogram. Therefore, the histogram does not look appealing and it becomes a little difficult to match the Y-axis values with the bars size.To solve this problem, we can use ylim argument of hist function in which the range can be supplied to plot on the Y-axis labels.ExampleConsider the below data and its histogram −set.seed(101) x
Read MoreHow to find similar words in vector of strings in R?
Sometimes strings in a vector of strings have spelling errors and we want to extract the similar words to avoid that spelling error because similar words are likely to represent the correct and incorrect form of a word. This can be done by using agrep with lapply function.Example 1x1
Read MoreCounting frequencies of array elements in C++
We are given an array of integer elements which contains duplicate values and the task is to calculate the frequencies of the distinct elements present in an array and print the result.Input − int arr[] = {1, 1, 2, 3, 4, 1, 2, 3}Output −frequency of 1 is: 3 frequency of 2 is: 2 frequency of 3 is: 2 Frequency of 4 is: 1Input − int arr[] = {2, 3, 4, 1, 5}Output −frequency of 1 is: 1 frequency of 2 is: 1 frequency of 3 is: 1 Frequency of 4 is: 1 Frequency of 5 is: 1Approach used in ...
Read MoreHow to change the position of axes titles to top for X-variable and to right for Y-variable in R?
The default position of axes titles in any software or programming language for any 2D graph is bottom for X-axis and left for Y-axis but we might to change the position of these titles to top and right respectively. This can be done by using scale_x_continuous(position="top") and scale_y_continuous(position="right") functions of ggplot2 package.ExampleConsider the below data frame −set.seed(101) x
Read MoreCount Uppercase, Lowercase, special character and numeric values in C++
We are given a string containing Uppercase letters, Lowercase letters, specials characters and number values also. The task is to calculate the frequency of all types of characters, special characters and numeric values in the string.Uppercase Letters − A - Z having ASCII values from 65 - 90 where, 65 and 90 are inclusive.Lowercase Letter − a - z having ASCII values from 97 - 122 where, 97 and 122 are inclusive.Numeric values − 0 - 9 having ASCII values from 48 - 57 where, 48 and 57 are inclusive.Special Characters − !, @, #, $, %, ^, &, *Input ...
Read MoreHow to create gridlines that matches with Y-axis values in the plot created by using plot function in R?
When we create a plot in R and draw gridlines then the gridlines are drawn on the basis of the values provided inside the grid function, therefore, it may or may not match with the Y-axis labels. But it can be done, we just need to set the values inside the grid function to NULL.ExampleConsider the below plot −x
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