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Articles by Nizamuddin Siddiqui
Page 107 of 196
How to find the percentage of zeros in each column of a data frame in R?
To find the percentage of zeros in each column of a data frame in R, we can follow the below steps −First of all, create a data frame.Then, use colSums function along with nrow function to find the percentage of zeros in each column.Example 1Create the data frameLet’s create a data frame as shown below −x
Read MoreHow to multiply corresponding values from two data frames in R?
To multiply corresponding values from two data frames in R, we can follow the below steps −First of all, create two data frames.Then, use mapply function to multiply corresponding values from those two data frames.ExampleCreate the first data frameLet’s create a data frame as shown below −df1
Read MoreHow to create a column of first non-zero value in each row of an R data frame?
To create a column of first non-zero value in each row of an R data frame, we can follow the below steps −First of all, create a data frame with some zero values.Then, use apply function and a custom function to find the first non-zero in each row of the data frame.ExampleCreate the data frameLet’s create a data frame as shown below −x
Read MoreHow to unsplit a split data.table object in R?
To unsplit a split data.table object in R, we can follow the below steps −First of all, create a data.table object.Then, use split function to split the data.table object.After that, use do.call function along with rbind function unsplit the data frame.ExampleCreate the data.table objectLet’s create a data.table object as shown below −library(data.table) Grp
Read MoreCreate ggplot2 graph with reversed Y-axis and X-axis on top in R.
To create ggplot2 graph with reversed Y-axis and X-axis on top, we can use scale_y_reverse and scale_x_continuous function of ggplot2 package.For Example, if we have a data frame called df that contains two columns say X and Y and we want to create the scatterplot between X and Y with reversed Y-axis and X-axis on top then we can use the below command −ggplot(df,aes(X,Y))+geom_point()+scale_y_reverse()+scale_x_continuous(position="top")ExampleFollowing snippet creates a sample data frame −x
Read MoreHow to create correlation matrix plot without variables labels in R?
To create correlation matrix plot without variables labels in R, we can use tl.pos argument set to n.For Example, if we have a correlation matrix say M then we can create the correlation matrix plot without variables labels by using the below command −corrplot(M,tl.pos='n')ExampleFollowing snippet creates a sample data frame −x
Read MoreHow to create bar plot with gradient colors using ggplot2 in R?\\n
To create bar plot with gradient colors using ggplot2, we can use scale_fill_gradient function where we can set the lower and higher color values.For Example, if we have a data frame called df that contains two columns say Cat and Count then we can create the bar plot with gradient colors by using the below command −ggplot(df,aes(Cat,Count,fill=Cat))+geom_bar(stat="identity")+scale_fill_gradient(low="blue",high="red")ExampleFollowing snippet creates a sample data frame −x
Read MoreCreate ggplot2 graph with darker axes labels, lines and titles in R
To create a ggplot2 graph with darker axes labels, darker lines, and dark titles, we can use theme_classic function of ggplot2 package with base_size argument set to a larger value.For Example, if we have a data frame called df that contains two columns say x and y then we can create the scatterplot between x and y using ggplot2 with darker axes labels, darker lines, and dark titles by using the below command −ggplot(df,aes(x,y))+geom_point()+theme_classic(base_size=22)ExampleFollowing snippet creates a sample data frame −x
Read MoreCreate multiple regression lines in a single plot using ggplot2 in R.
To create multiple regression lines in a single plot using ggplot2, we can use geom_jitter function along with geom_smooth function. The geom_smooth function will help us to different regression line with different colors and geom_jitter will differentiate the points.Check out the below Example to understand how it can be done.ExampleFollowing snippet creates a sample data frame −x1
Read MoreCreate a graph without background panel using ggplot2 in R.
To create a graph without background panel, we can use theme function of ggplot2 package where we can set panel.background argument to blank.For Example, if we have a data frame called df that contains two columns say x and y then we can create scatterplot between x and y without background panel using ggplot2 by using the below command −ggplot(df,aes(x,y))+geom_point()+theme(panel.background=element_blank())ExampleConsider the below data frame −x
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