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Struggling with the `non numeric error` in R while trying to create additional empty columns in your data frame? Discover the solution and learn how to correctly manipulate data frames in R!
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This video is based on the question https://stackoverflow.com/q/69521614/ asked by the user 'ks ramana' ( https://stackoverflow.com/u/12137466/ ) and on the answer https://stackoverflow.com/a/69522231/ provided by the user 'guna' ( https://stackoverflow.com/u/4414781/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix the Non Numeric Error When Adding Empty Columns in Data Frames

When working with data frames in R, you may sometimes encounter errors that can hinder your progress. One such common issue is the non numeric argument to binary operator error. This problem arises particularly when you attempt to add empty columns to your data frame but inadvertently use a character column in your calculations. In this guide, we'll examine the source of this error and how to solve it.

Understanding the Problem

Imagine you are working with a data frame that contains various types of data, including character strings, numeric values, and dates. Below is the structure of an example data frame, df1:

[[See Video to Reveal this Text or Code Snippet]]

In this dataframe, ROW_ID, which is supposed to be numeric, is defined as a character string. When you attempt to use the following code to create additional empty columns in the range 15 to 118 using the sapply function:

[[See Video to Reveal this Text or Code Snippet]]

you encounter the following error:

[[See Video to Reveal this Text or Code Snippet]]

Solution Steps

The solution to this problem is quite straightforward: ensure that the ROW_ID column is treated as a numeric value instead of a character. Here’s how to fix the issue step-by-step.

Step 1: Modify the Data Frame

Change the declaration for the ROW_ID column from a character vector to a numeric vector. Here's how your updated data frame should look:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Re-run the Column Addition Code

Now that the ROW_ID column is numeric, you can execute the code to create the additional empty columns without any errors:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By converting the ROW_ID to a numeric format, you've resolved the non numeric error and successfully created the additional empty columns in your data frame. This small but crucial change can save you from unnecessary frustrations while working with data in R.

If you run into similar issues in the future, remember to check your data types before performing operations that rely on numeric values.

Now you're ready to tackle data frames with confidence! Happy coding!