Extract & Count Unique Values in Each Column of Data Frame in R (Example) | lapply, rapply & length

video will be more usefull if you move your picture far from code

Nice

Hi,
How about if we want to find out the number of occurrence of certain words appear in columns? For example, I want to find out how many times "yes" appear in my data frame. Any help will be appreciated!

dear plz how to compute the CPM/rpk/rpkm/tpm values for each sample

Thank you very much! I was trying to answer the question of how to identify categorical data in a set without having previous knowledge of said dataset. Your video immediately solved my question. Thanks from Brazil!

Good to know and could be quite useful. Thanks!

Thank you. Good job! (from Brazil: Parabéns! Excelente didática. Eu tenho aprendido muito com seus vídeos. Obrigado.)