r - How to remove the 1st character of a string? -


this question has answer here:

please me removing first character column string variable ("t")? 

 > head(ecghr_long) id  t ecg_hr 1 2003 t0     70 2 2004 t0     98 3 2008 t0     93 4 2010 t0     71 5 2018 t0     90 6 2019 t0     60

many

i replace letter part empty string:

as.numeric(sub('[a-za-z]', '', c('t0', 't1')))

the regular expression [a-za-z] matches letters, , replaces ''. as.numeric casts result number.


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