r - Keeping the main name of column using dcast -

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i have rows same name , want convert them columns keeping main name of column , add 1 or 2 etc. according how many columns exist.

i use make it:

setdt(df)[, n:= 1:.n, maincol] df <- dcast(df, url~n, value.var=c("stock"))

what expect have names stock_1, stock_2 etc. every column has number 1,2 etc. how can modify it?


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