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Articles by Nizamuddin Siddiqui
Page 143 of 196
How to subset non-duplicate values from an R data frame column?
Generally, the duplicate values are considered after first occurrence but the first occurrence of a value is also a duplicate of the remaining. Therefore, we might want to exclude that as well.The subsetting of non-duplicate values from an R data frame column can be easily done with the help of duplicated function with negation operator as shown in the below Examples.Example 1Following snippet creates a sample data frame −x
Read MoreCreate a data.table object of combination of correlation coefficients.
To create a data.table object of combination of correlation coefficients, we first need to find the correlation matrix then the combination of variables for which the correlation matrix is created then data.table will be used to combine the combination of variables and the correlation coefficients.Check out the below Examples to understand how it can be done.Example 1Following snippet creates a sample data frame −x1
Read MoreSelect columns of an R data frame and skip if does not exist.
Sometimes we have a large number of columns in the data frame and we know the name of some columns but among known ones some does not exist in the data frame. Now if we want to select the columns that we know and skip the ones that do not exist then we can use the subsetting.For Example, if we have a data frame called df that contains twenty columns and we believe that x, y, z exists in df but z is not there in reality. Now the selection of columns x, y, z that will skip z can ...
Read MoreHow to divide columns of a matrix by vector elements in R?
Suppose we have a vector say V that contains five elements and a matrix say M that has five columns. Now again, suppose that we want to divide each column in M by corresponding value in vector V, which means first column in M will be divided by first value in the V and so on then we can use the sweep function as shown below −sweep(M,2,V,FUN="/")Example 1Consider the below matrix and vector −M1
Read MoreHow to create a time series plot in R without time vector?
To create a time series plot in R without time vector, we can use ts.plot function.For Example, if we have a vector called X then we can create the time series plot of X by using the command ts.plot(X), the Output of this command will have a time axis in place of X-axis. Check out the below Examples to understand how it works.Example 1Consider the following vector −x
Read MoreHow to create vertical line in xyplot in R?
To create vertical line in xyplot, we can use abline function.For Example, if we have a data frame called df that contains two columns say X and Y and we want to create a scatterplot between X and Y using xyplot with a vertical line at X = 2 then we can use the below command −xyplot(y~x,df,abline=c(v=2))ExampleConsider the data frame given below −x
Read MoreCombine values of two columns separated with hyphen in an R data frame.
To combine values of two columns separated with hyphen in an R data frame, we can use apply function.For Example, if we have a data frame called df that contains only two columns say X and Y then we can combine the values in X and Y by using the below command given below −df$X_Y
Read MoreHow to find the class of columns of an R data frame?
To find the class of columns of an R data frame, we can use class function along with sapply and as.data.frame function.For Example, if we have a data frame called DF then we can find the class of columns in DF by using the command as follows −data.frame(sapply(DF, class))Example 1Consider the below data frame −head(mtcars, 20) The following dataframe is created mpg cyl disp hp drat wt qsec vs am gear carb Mazda RX4 21.0 6 160.0 110 3.90 ...
Read MoreHow to check which list element contains a particular value in R?
A list in R can have large number of elements and also of different types. If we have a list that contain vectors and we want to check which list element contains a particular value then we can use which function along with sapply function.For Example, if we have a list called LIST then we can find which element of LIST contains 5 then we can use the command given below −which(sapply(LIST, FUN=function(X) 5 %in% X))Example 1Consider the List given below −List1
Read MoreHow to convert strings in R data frame to unique integers?
To convert strings in R data frame to unique integers, we first need to extract the unique strings in the data frame and then read them inside data.frame function with as.numeric along with factor function.Check out the below Examples to understand how it works.Example 1Consider the below data frame −x1
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