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R Programming Articles
Page 127 of 174
How to divide all columns by one column and keeping original data in R?
To divide all columns of data frame in R by one column and keeping the original data, we can use mutate_at function of dplyr package along with list function.For example, if we have a data frame called df that contains five columns say x, y, z, a, and b then we can divide all columns by b and keep the original data by using the below given command −df%>%mutate_at(vars(x:b),list(All_by_b=~./b))Example 1Following snippet creates a sample data frame −x1
Read MoreCreate histogram with horizontal boxplot on top in base R.
To create a histogram with horizontal boxplot on top in base R, we first need to define the layout of the plotting area with layout function and par function margin (mar) then the boxplot will be created and after that the histogram will be created. While creating the boxplot and histogram we need to make sure that the ylim for boxplot and xlim for histogram are same.Check out the below Example to understand how it can be done.ExampleTo create a histogram with horizontal boxplot on top in base R, use the following snippet −x
Read MoreHow to increase the width of lines for histogram like plots in base R?
The histogram like plot in base R is the plots of vertical lines instead of points in a vector or column of a data frame. If we increase the width of these lines then the plot becomes more like a histogram as the increment in widths make the vertical lines look like bars.To increase the width of lines for histogram like plots in base R, we can use lwd argument.Check out the below example to understand the difference between point chart and histogram like plot in base R.ExampleUse the code given below to increase the width of lines for histogram ...
Read MoreHow to increase the X-axis labels font size using ggplot2 in R?
To increase the X-axis labels font size using ggplot2, we can use axis.text.x argument of theme function where we can define the text size for axis element. This might be required when we want viewers to critically examine the X-axis labels and especially in situations when we change the scale for X-axis.Check out the below given example to understand how it can be done.ExampleFollowing snippet creates a sample data frame −x
Read MoreHow to create a group column in an R data frame?
Suppose we have a data frame called df that contains two columns say X and Y then we can create a group column based on X and Y by converting df into a data.table object and creating list of values in X and Y with list function.Check out the below Examples to understand how it can be done.Example 1Following snippet creates a sample data frame −x1
Read MoreHow to multiply two matrices in R if they contain missing values?
If we want to multiply two matrices if they contain missing values then we first need to convert the missing values to zeros and then the multiplication can be easily done. If we do not do so then the Output of the multiplication will have NAs at all positions.Check out the Examples given below to understand the correct of multiplication if NAs are present in the matrices.Example 1Following snippet creates a sample matrix −M1
Read MoreHow to hide outliers in base R boxplot?
To hide outliers in base R boxplot, we can use range argument inside boxplot function but we will have to play with range argument. The range argument can take many values therefore, we would need to find the correct one that removes all the outliers. To understand how it works check out the Example given below −ExampleTo hide outliners in base R boxplot, use the following snippet −x
Read MoreHow to remove line numbers from data.table object in R?
To remove line numbers from data.table object in R, we can set row.names to FALSE and print the data.table object.For Example, if we have a data.table object called DT then we can remove line numbers from DT by using the command given below −print(DT,row.names=FALSE)Example 1To load data.table object and create an object use the following snippet to create a data frame −library(data.table) x1
Read MoreFind the value in an R data frame column that exist n times.
To find the value in an R data frame column that exist n times, we first need to tabulate the column with factor then extracting the levels of the column after that reading them with as.numeric.Check out the Examples given below to understand how it can be done.Example 1Following snippet creates a sample data frame −x
Read MoreHow to round matrix values in R?
To round matrix values, we can use round function.For Example, if we have a matrix called M and we want to round the value in M to 2 decimal places by using the below command −M
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