r - How do I get the highest number from a dataframe with chars and numbers? -


i have dataframe dat:

label    col1  col2  col3 meat     10    20    30 veggies  20    30    40

when run max(dat), error: 

error in fun(x[[i]], ...) :    defined on data frame numeric variables

if run max(sapply(dat, is.numeric)), 1.

what function(s) show me highest numeric value in dataframe chars , numbers?


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