substring
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> data(state)
> state.name[47:50]
[1] "Washington" "West Virginia" "Wisconsin" "Wyoming
·>
substring(state.name[47:50], first=3, last=1000)[1] "shington" "st Virginia" "sconsin" "oming"> > substri ...
2010-8-16 13:38 - dxystata - R语言论坛