Create a new column based on an index column with error

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Create a new column based on an index column with error



I am referring to a previous question:-
Create a new column based on an index column



I've tried few conversions to convert into tibble but still hitting the following error:


> Can't use matrix or array for column indexing



Need to create the NewCol based on the colnumber in SecondLast



Here the sample data:-


structure(list(L1;L2;L3;L4;L5;L6;L7;L8;L9;L10;SecondLast;NewCol = c("10001;1;NA;NA;NA;NA;NA;NA;NA;NA;1;10001",
"10005;1;NA;NA;NA;NA;NA;NA;NA;NA;1;10005", "10006;10001;1;NA;NA;NA;NA;NA;NA;NA;2;10001",
"10007;10003;1;NA;NA;NA;NA;NA;NA;NA;2;10003", "10008;1;NA;NA;NA;NA;NA;NA;NA;NA;1;10008",
"10009;10004;1;NA;NA;NA;NA;NA;NA;NA;2;10009", "10021;10005;1;NA;NA;NA;NA;NA;NA;NA;2;10005",
"10022;1;NA;NA;NA;NA;NA;NA;NA;NA;1;10022", "10023;10055;10182;10201;10164;10088;10049;10027;10022;1;9;10022",
"10024;10004;1;NA;NA;NA;NA;NA;NA;NA;2;10004", "10025;10055;10182;10201;10164;10088;10049;10027;10022;1;9;10022",
"10030;10010;10003;1;NA;NA;NA;NA;NA;NA;3;10003", "10031;10043;10056;10020;10003;1;NA;NA;NA;NA;5;10003"
)), row.names = c(NA, -13L), class = c("tbl_df", "tbl", "data.frame"
), spec = structure(list(cols = list(`L1;L2;L3;L4;L5;L6;L7;L8;L9;L10;SecondLast;NewCol` = structure(list(), class = c("collector_character",
"collector"))), default = structure(list(), class = c("collector_guess",
"collector"))), class = "col_spec"))



This is the code I used:



df$Leader <- df [1:30][cbind(seq_len(nrow(df)), df$SecondLast)]


df$Leader <- df [1:30][cbind(seq_len(nrow(df)), df$SecondLast)]



How to convert the data type into the right class?





Please format you question and make it easier on eyes.
– Arash Kazemi
1 hour ago





Noted...I try harder next time...thanks
– kengfui
1 hour ago





You may want to share your sample data using dput(head(df))
– Prem
1 hour ago


dput(head(df))





Getting better....thanks for the input.
– kengfui
49 mins ago




1 Answer
1



I got it finally....



The initial class for my table is
[1] "tbl_df" "tbl" "data.frame"



I did a as.data.frame conversion to
[1] "data.frame"



Thanks guys






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