suppose I have a data frame consist of 60 columns and 170 observations. The rating for each of the 60 variables is from 1-7. Now I want to calculate how many "5" are there in the data frame, how should I do that using R?
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Try `sum(df == 5)`, but consider to give a [minimal reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example). – markus Oct 17 '18 at 13:19
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Or try `table(as.vector(as.matrix(df)))` – G5W Oct 17 '18 at 13:35
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thanks, that second answer works – jeff.lian Oct 17 '18 at 13:38
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> df <- sample(1:7, 10200, replace=TRUE) %>%
+ matrix(nc = 60, nr = 170)
>
> df %>% .[df == 5] %>% plyr::count()
x freq
1 5 137
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