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Articles by Nizamuddin Siddiqui
1,958 articles
How to remove a character in an R data frame column?
To remove a character in an R data frame column, we can use gsub() function which will replace the character with blank. For example, if we have a data frame called df that contains a character column say x which has a character ID in each value then it can be removed by using the command gsub("ID", "", as.character(df$x)).Example1Consider the below data frame −Live Demo> x1 x2 df1 df1Output x1 x2 1 Male1 8 2 Female1 4 3 Male1 9 4 Male1 2 5 Male1 7 6 Female1 5 7 Male1 3 ...
Read MoreHow to create a vector with repeated values in R?
There are two methods to create a vector with repeated values in R but both of them have different approaches, first one is by repeating each element of the vector and the second repeats the elements by a specified number of times. Both of these methods use rep function to create the vectors.ExampleConsider the below examples −> x1 x1 [1] 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 [39] 4 ...
Read MoreHow to find the R version you are using?
Most of the times, we need to use packages in R and some packages are restricted to different versions in R, generally to newer versions. Therefore, we might need to find which version of R we are using. To find the R version, we can directly use the command R.Version().Example Live DemoR.Version()Output$platform [1] "x86_64−w64−mingw32" $arch [1] "x86_64" $os [1] "mingw32" $system [1] "x86_64, mingw32" $status [1] "" $major [1] "4" $minor [1] "0.2" $year [1] "2020" $month [1] "06" $day [1] "22" $`svn rev` [1] "78730" $language [1] "R" $version.string [1] "R version 4.0.2 (2020−06−22)" $nickname [1] "Taking Off Again"We can ...
Read MoreHow to convert more than one column in R data frame to from integer to numeric in a single line code?
To convert columns of an R data frame from integer to numeric we can use lapply() function. For example, if we have a data frame df that contains all integer columns then we can use the code lapply(df,as.numeric) to convert all of the columns data type into numeric data type.Example1Consider the below data frame − Live Demoset.seed(871) x1
Read MoreHow to get only Date portion from DateTime object in C#?
There are several ways to get only date portion from a DateTime object.ToShortDateString() − Converts the value of the current DateTime object to its equivalent short date string representation.Returns a string that contains the short date string representation of the current DateTime object.ToLongDateString() − Converts the value of the current DateTime object to its equivalent long date string representation.Returns a string that contains the long date string representation of the current DateTime object.ToString() − One more way to get the date from DateTime is using ToString() extension method.The advantage of using ToString() extension method is that we can specify the ...
Read MoreHow to remove all rows having NA in R?
To remove all rows having NA, we can use na.omit() function. For Example, if we have a data frame called df that contains some NA values then we can remove all rows that contains at least one NA by using the command na.omit(df).That means if we have more than one column in the data frame then rows that contains even one NA will be removed. Check out the below Examples to understand how it works.Example 1Consider the below data frame −x1
Read MoreHow to find items in one list that are not in another list in C#?
LINQ Except operator comes under Set operators category in LINQThe Except() method requires two collections and finding those elements which are not present in the second collectionExcept for the extension, the method doesn't return the correct result for the collection of complex types.Example using Except() method Live Demousing System; using System.Collections.Generic; using System.Linq; namespace DemoApplication { class Program { static void Main(string[] args) { List animalsList1 = new List { "tiger", "lion", "dog" }; Console.WriteLine($"Values in List1:"); ...
Read MoreHow to find the moving standard deviation in an R matrix?
To find the moving standard deviation in a matrix is done in the same way as in a data frame, we just need to use the matrix object name in place of data frame name. Hence, we can make use of rollapply function of zoo package for this purpose.For example, if we have a matrix called M and we want to find the 2 moving standard deviations then we can use the below given command −rollapply(M,width=2,FUN=sd,fill=0,align="r")Example 1Following snippet creates a matrix −M1
Read MoreHow to round the summary output in R?
To round the output of summary function in R, we can use digits argument while applying the summary function.For example, if we have a data frame called df then to find the summary statistics with two digits in the output we can use the below given command −summary(df, digits=2)Example 1Following snippet creates a dataframe −head(iris, 20) The following dataframe is created − Sepal.Length Sepal.Width Petal.Length Petal.Width Species 1 5.1 3.5 1.4 0.2 setosa 2 4.9 3.0 1.4 ...
Read MoreHow to find the row wise sum for n number of columns in R?
To find the row wise sum of n number of columns can be found by using the rowSums function along with subsetting of the columns with single square brackets.For example, if we have a data frame called df that contains five columns and we want to find the row sums for last three columns then we can use the following command −df$Sum_3
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