In data.matrix(x) : NAs introduced by coercion

I am trying to create a matrix from a csv file, but when I run data.matrix R gives me this warning message:
In data.matrix(x) : NAs introduced by coercion.

What can I do to substitute de NAs for their true values?

Hi, welcome!

We don't really have enough info to help you out. Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

If you've never heard of a reprex before, you might want to start by reading this FAQ:

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