Inconsistent match function, if I run twice works (R) -

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i trying reorder numeric vector current_qty using name according vector trade_order.

after simple match, give me weird arrangement.

current_qty <- getquantity(trades) print(names(current_qty)) [1] "ivvb11"       "lft20210301"  "ltn20180101"  "ntnb20200815" "pibb11"       print(trade_order) [1] "pibb11"       "ivvb11"       "lft20210301"  "ntnb20200815" "ltn20180101"  current_qty <- current_qty[match(names(current_qty), trade_order)] print(current_qty) lft20210301  ltn20180101     pibb11 ntnb20200815       ivvb11       2.15        42.59        50.00         3.89        60.00

now funny part. if run same match function twice. works.

current_qty <- getquantity(trades) print(names(current_qty)) [1] "ivvb11"       "lft20210301"  "ltn20180101"  "ntnb20200815" "pibb11"       print(trade_order) [1] "pibb11"       "ivvb11"       "lft20210301"  "ntnb20200815" "ltn20180101"  current_qty <- current_qty[match(names(current_qty), trade_order)] current_qty <- current_qty[match(names(current_qty), trade_order)] print(current_qty) pibb11       ivvb11  lft20210301 ntnb20200815  ltn20180101  50.00        60.00         2.15         3.89        42.59

what doing wrong? there way it?

from help(match):

"match returns vector of positions of (first) matches of first argument in second."

so looks @ each element in names(current_qty) , returns position of in trade_order. example sees "ivvb11" in second position on trade_order. gets passed subset reorders things. move element in position 2 of current_qty ("lft20210301") first position.

thus, can see should reverse order of args pass match , fine:

current_qty[match(trade_order, names(current_qty))]


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