Code snippet to find number of null values in each column in a dataframe in R

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Hi. Can someone help me to create R code to find number of null values in each column in a dataframe? I want group of statements to find number of nulls in a single function than finding for each column separately.
Jul 3 in Data Analytics by prakash
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3 answers to this question.

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Hi @prakash, Use lapply function() to find the length for each column.

R code - 

lapply(data_frame,function(x) { length(which(is.na(x)))})

Ex: I used Air quality dataset available in R datasets.

Hope it helps!

answered Jul 4 by Cherukuri
• 19,550 points
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You can also use summary(data_frame) to see the number of nulls for every column at the last row.

answered Jul 4 by anonymous
• 19,550 points
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colSums(is.na(data_frame_name)) will return you number of nulls in each column.

answered Jul 5 by sindhu

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