Difference between `do.call()` a function and directly call a function in R? -


here code:

>ipo_num_year<- do.call(length,list(as.name(paste0("all_data_align_",year)))) >ipo_num_year >90 >ipo_num_year<- length(as.name(paste0("all_data_align_",year))) >ipo_num_year >1

year string object "1999";

in previous code,all_data_align_1999 has been assigned list 90 elements,so right result ipo_num_year equals 90.but second line makes ipo_num_year equals 1,it means length() function return value of as.name() symbol object,so length 1.

why return value of as.name() can not directly used argument of function length()? , why first solution works fine?

some 1 may ask why don't use length(all_data_align_1999).that because year loop variable in code.

really appreciate kindly reply!

instead of as.name should use get:

length(get(paste0("all_data_align_",year)))

you need retrieve object not name.


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