Change the class from factor to numeric of many columns in a data frame

by

You have to be careful while changing factors to numeric. Here is a line of code that would change a set of columns from factor to numeric. I am assuming here that the columns to be changed to numeric are 1, 3, 4 and 5 respectively. You could change it accordingly

cols = c(1, 3, 4, 5);    
df[,cols] = apply(df[,cols], 2, function(x) as.numeric(as.character(x)));

More Related Contents:

  1. r: convert a string to date [duplicate]
  2. Why is using assign bad?
  3. data.table objects assigned with := from within function not printed
  4. Split string column to create new binary columns
  5. Create counter within consecutive runs of values
  6. standard evaluation in dplyr: summarise a variable given as a character string
  7. .EACHI in data.table?
  8. Subset of rows containing NA (missing) values in a chosen column of a data frame
  9. rbind dataframes with a different column name
  10. Is there a more elegant way to convert two-digit years to four-digit years with lubridate?
  11. Prevent row names to be written to file when using write.csv
  12. Line break when no data in ggplot2
  13. Converting Date formats in R [closed]
  14. How to convert data.frame column from Factor to numeric [duplicate]
  15. Stacked barplot with colour gradients for each bar
  16. Expand spacing between tick marks on x axis
  17. how to convert data.frame to transactions for arules
  18. Convert dataframe column to 1 or 0 for “true”/”false” values and assign to dataframe
  19. Count observations greater than a particular value [duplicate]
  20. Element-wise mean over list of matrices [duplicate]
  21. Sending email in R via outlook [closed]
  22. Add number of observations per group in ggplot2 boxplot
  23. How to pass command-line arguments when calling source() on an R file within another R file
  24. Remove space between bars ggplot2
  25. How to increase the number of columns using R in Linux
  26. Convert a data frame to a data.table without copy
  27. How to add shaded confidence intervals to line plot with specified values
  28. How to calculate adjacency matrices in R
  29. Removing Unused Factors from a Facet in ggplot2
  30. What is the first column in R’s mtcars dataset?

Leave a Comment