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Frequently Asked Questions

What is datadatacamp’s Cheat Sheet?

DataCamp ’s data.table cheat sheet is a quick reference for doing data manipulations in R with the data.table R package and syntax The cheat sheet will guide you from doing simple data manipulations using data.table ’s basic i, j, by syntax, to chaining expressions, to using the famous set () -family.

What is data table in R?

The data.table R package provides an enhanced version of data.frame that allows you to do blazing fast data manipulations. The data.table R package is being used in different fields such as finance and genomics and is especially useful for those of you that are working with large data sets (for example, 1GB to 100GB in RAM).

What is the best way to learn data tables?

The DataCamp course explains the whole data table package extensively. You can do the exercises at your own pace in your browser while getting hints and feedback, and review the videos and slides as much as you want. This interactive way of learning allows you to gain profound knowledge and practical experience with data tables.

What can be done in the ‘J’ part of a data table?

As the columns of a data table are seen as variables, and the parts of ‘j’ are evaluated as expressions, virtually anything can be done in the ‘j’ part. This significantly shortens your programming time. The final section of this data.table R tutorial focuses on the ‘by’ part.

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