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Articles by Nizamuddin Siddiqui
Page 128 of 196
How to change the row order in an R data frame?
To change the row order in an R data frame, we can use single square brackets and provide the row order at first place.For example, if we have a data frame called df that contains 10 rows then we can change the row order by using the command given below −df[c(6:8,2,5,9,10,1,3:4),]Check out the below examples to understand how it works.Example 1Following snippet creates a sample data frame −x1
Read MoreHow to create histogram like plot with different color of bars in R?
To create histogram like plot with different color of bars, we can use col argument and provide the range up to the number of bars we expect in the histogram like plot.For example, if we have a vector of length 10 called X then we can create histogram like plot of X with different color of bars using the command given below −plot(X,type="h",col=1:10,lwd=5)Check out the below example to understand how it works.ExampleTo create histogram like plot with different color of bars, use the following command −x
Read MoreHow to randomly split a vector into n vectors of different lengths in R?
To randomly split a vector into n vectors of different lengths, we can use sample function and set the repl argument to TRUE.For example, if we have a vector called X of size 100 then we can split it randomly into 10 vectors of different lengths by using the below command −split(X,sample(10,100,repl=TRUE))Example 1To randomly split a vector into n vectors of different lengths, use the following code −x
Read MoreHow to scale some columns in data.table object in R?
To scale some columns in data.table object in R, we can follow the below steps −First of all, create a data.table object.hen, subset the columns with single square brackets and use lapply, list and scale function to scale those columns.ExampleCreate the data.table objectLet’s create a data.table object as shown below −library(data.table) var1
Read MoreHow to unsplit a split in R data frame?
To unsplit a split in R data frame, we can follow the below steps −First of all, create a data frame.Then, use split function to split the data frame.After that, use do.call function along with rbind function unsplit the data frame.ExampleCreate the data frameLet’s create a data frame as shown below −x
Read MoreHow to reorder the row indices in an R data frame?
If we have a data frame where row indices are not in correct sequence then we can set them to NULL to get the correct sequence of row numbers starting from 1.For example, if we have a data frame called df which has row ordered in an inappropriate way then we can reorder the row indices in correct order by using the command given below −row.names(df)
Read MoreHow to print the exact values of all elements in a column of an R data frame?
To print the exact values of all elements in a column of an R data frame, we can follow the below stops −First of all, create a data frame.Then, use options function and provide the required number of digits for printing.ExampleCreate the data frameLet’s create a data frame as shown below −x
Read MoreHow to change the color code of corrplot in R?
To change the color code of corrplot, we can use colorRampPalette function inside corrplot function. We can provide different colors in colorRampPalette that we want to display in the corrplot.Check out the below given example to understand how it can be done.ExampleFollowing snippet creates a sample data frame −x
Read MoreHow to check if two vectors are exactly same in R?
To check if two vectors are exactly same, we can use identical function.For example, if we have two vectors say x and y then we can find whether both of them are exactly same or not by using the command given below −identical(x,y)Check out the below examples to understand the result of identical function for two vectors.Example 1To check if two vectors are exactly same, use the command given below −x1
Read MoreChange the outline color for histogram bars using ggplot2 in R.
To change the outlines color of histogram bars using ggplot2, we can use col argument inside geom_histogram function of ggplot2 package.For Example, if we have a data frame called df that contains a column say X then we can create the histogram of X with different outline color of bars using the below command −ggplot(df,aes(X))+geom_histogram(bins=30,col=I("red"))ExampleFollowing snippet creates a sample data frame −x
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