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Articles by Nizamuddin Siddiqui
Page 99 of 196
How to create a column with ratio of two columns in R?
To create a new column with ratio of two columns in an R data frame, we can use division sign.For example, if we have a data frame called df that contains two columns say X and Y and we want to create a new column with ratio of X and Y then we can use the below given command −df$Ratio_X_Y
Read MoreHow to find the number of times a variable changes its sign in an R data frame column?
To find the number of times a variable changes its sign in an R data frame column, we can use sign function with diff and sum function.For example, if we have a data frame called df that contains a column say C then, we can find the number of times C changes its sign by using the following command −sum(diff(sign(df$C))!=0)Example 1Following snippet creates a sample data frame −x
Read MoreHow to change the color of line in xyplot in R?
To change the color of line in xyplot, we can use col argument.For example, if we have two vectors say X and Y and we want to create a red colored xyplot between X and Y then we can use the following command −xyplot(x~y,type="l", col="red")Check out the below example to understand how it works.ExampleTo change the color of line in xyplot, use the code given below −set.seed(123) library(lattice) xyplot(1:5~rpois(5,5),type="l",col="blue")OutputIf you execute the above given code, it generates the following output −
Read MoreHow to display outliers in boxplot with different shape in base R?
To display outliers in boxplot with different shape in base R, we can use outpch argument in boxplot.For example, if we have a vector called X that contains some outliers then we can create a boxplot of X with different shape of outliers by using the below given command −boxplot(X,outpch=17)ExampleTo display outliers in boxplot with different shape in base R, use the code given below −x
Read MoreHow to change the color of box of boxplot in base R?
To change the color of box of boxplot in base R, we can use col argument inside boxplot function.For example, if we have a vector called V and we want to create a boxplot of V without red colored box then we can use the following command −boxplot(x,col="red")ExampleTo change the color of box of boxplot in base R, use the code given below −x
Read MoreHow to change the color of outliers in base R boxplot?\\n
To change the color of outliers in base R boxplot, we can use outcol argument in boxplot function.For example, if we have a vector called X that contains some outliers then we can create a boxplot of X with blue color outliers by using the below given command −boxplot(X,outcol="red")ExampleTo change the color of outliers in base R boxplot, use the code given below: −x
Read MoreHow to test if strings stored in a vector are present in an R list?
To test if strings stored in a vector are present in an R list or not, we can use mapply function. For example, if we have a vector of strings say V and a list called LIST then we can check whether elements in V are present in LIST by using the following command − mapply(`%in%`,V,LIST)Example 1Following snippet creates a vector and list −x
Read MoreFind the frequency of successive occurrences less than equal to a threshold in an R data frame column?
To find the frequency of successive occurrences less than a threshold value in an R data frame column, we can use rle function along with sum function.Check out the below given examples to understand how it can be done.Example 1Following snippet creates a sample data frame −x
Read MoreHow to find numbers that are divisible by a certain number for a range of values in R?
In R, the divisibility of a number by a certain number can be found by using the modulus operator %%. If we want to check the divisibility of a set of numbers by a certain number then for loop will be used.Check out the below given examples to understand how it can be done.Example 1To check which numbers between 1 and 100 are divisible by 10, use the following code −for(x in 1:100){ + if(x%%10==0){ + print(x) + } + }If you execute the above given code, it generates the following output −[1] 10 ...
Read MoreHow to create a scatterplot with white background and no gridlines using ggplot2 in R?
Practically, the scatterplots are well visualized on white background just like on white paper. If we want to create a scatterplot with white background and without gridlines using ggplot2 then we can apply classic theme to the plot.Check out the below given example to understand how it can be done.ExampleFollowing snippet creates a sample data frame −x
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