Difference between the and in operators in R

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The question concerns the practical difference between the == and %in% operators in R.

I have run into an instance at work where filtering with either operator gives different results (e.g. one results on 800 rows, and the other 1200). I have a problem in the past and am able to validate that ensures I get the results I desire. However, I am still stumped regarding how they are different.
Jun 1 in Data Science by avinash
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