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Suppose I want to keep only 4 digits after the decimal point in a number. How can I limit the number of digits?

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You can use either round() or format() function to limit the number of digits after the decimal place.

Here is an example:

> round(1.453245, digits = 4)
[1] 1.4532
> format(0.123235, digits=4)
[1] "0.1232"