isnull, isna
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What is isnull, isna?
Detecting missing values in R relies on is.na(), since direct comparison like NA == NA doesn't return TRUE the way you might expect. This function returns a logical vector marking which values are missing, which can then be summed to count them or used to filter rows. It's the starting point before deciding how to handle any missing data found.
More in stage 12: Strings and Dates
isnull, isna: common questions
Can I learn isnull, isna in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain isnull, isna in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this isnull, isna tutorial for beginners?
It is lesson 80 of 129 in the free R Programming roadmap, in stage 12, Strings and Dates. If you are new to R Programming, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.