How to calculate row counts in dataframe of specific cells in R -

i asked similar question before here: how calculate percentage of cells in data frame start sequence in r?

i'll copy of on ask new question.

i have data looks like:

set_1     set_2     set_3     set_4     set_5     set_6     set_7 abc89     abc62     67        abc513    abc512    abc81     abc10 abc6      pop       abc11     abc4      giant     13        abc15 abc90     abc16     abc123    abc33     abc22     abc08     9 111       abc15     abc72     abc36     abc57     abc9      abc55 

i make histogram of row counts. count cells start "abc". row 1 have 6 cells. row 2 has 4 cells. row 3 has 6 cells, etc. make histogram of this. how can done in r? data in data.frame.

you can count number of entries starting "abc" in each row with

y <- apply(df, 1, function(x) sum(grepl("^abc", x))) #> y  #[1] 6 4 6 6  

this result plotted in histogram with

hist(y, breaks=c(1:max(y)), main = "frequency of 'abc' entries", col="lightblue") 

if prefer graphical representation of value of "abc" counts each row, use barplot() instead of hist():

barplot(y, main = "number of 'abc' entries in each row",col="lightblue") 

data

text <- "set_1     set_2     set_3     set_4     set_5     set_6     set_7 abc89     abc62     67        abc513    abc512    abc81     abc10   abc6      pop       abc11     abc4      giant     13        abc15 abc90     abc16     abc123    abc33     abc22     abc08     9 111       abc15     abc72     abc36     abc57     abc9      abc55" df <- read.table(text=text, header=t)