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2005 Oct 20
2
String manipulation
R-help, I have a data frame which contains a character string column that is something like; II11 II18 II23 III1 III13 III16 III19 III2 III7 IV10 IV11 IV12 IX16 IX4 V12 V18 V2 V20 V23 V4 VII14 VII18 VII21 VII26 VII28 VII33 VII4 VII48 VII5 .... .... .... I want to apply a function (e.g mean) by grouping according to the roman part of the string, i.e, by I by V by VII ... ... and so on. I have look...