I have a data.frame with rownames taken from a database. Unfortunately, one of the rownames (automatically obtained from the DB) is an empty string. I often do computations on the DB s.t. the answers (rows) are indexed with respect to the rownames so a computation on a DB record might necessitate the indexing into the data.frame by the emtpy row name. Unfortunately, that doesn't seem to work. Explicitly: I have this statement (in a loop going through sourceNames which are rownames of the data.frames CurrentRecordBlankFieldsCountSums and BlankFieldsCount):
BlankFieldsCount[sourceNamei,]= BlankFieldsCount[sourceNamei,] + CurrentRecordBlankFieldsCountSums[sourceNamei ,]; if sourceNamei is any name other than "" it works fine but otherwise CurrentRecordBlankFieldsCountSums[sourceNamei ,] returns a bunch of NAs because apparently it didn't fine a row named "". IMHO, if R lets you name a row "", then it should let you index it with the name "". Anyway, as further proof of the setup: > rownames(CurrentRecordBlankFieldsCountSums)  "" # So the first rowname of CurrentRecordBlankFieldsCountSums is an empty string "" > CurrentRecordBlankFieldsCountSums[1 ,] IDCaseNumber Category SSN LastName FirstName 0 0 1 0 0 # So, the first row has some data (not just NAs as would be returned if that row didn't exist) But ff I index that same row using the rowname it doesn't find the row: > CurrentRecordBlankFieldsCountSums[rownames( > CurrentRecordBlankFieldsCountSums) ,] IDCaseNumber Category SSN LastName NA NA NA NA # I get the same result if I do this:CurrentRecordBlankFieldsCountSums["" ,] As a sanity check: > "" == rownames(CurrentRecordBlankFieldsCountSums)  TRUE For other rows, (rownames that aren't "", there's no problem): > rownames(CurrentRecordBlankFieldsCountSums)  "FRED" > CurrentRecordBlankFieldsCountSums[rownames( > CurrentRecordBlankFieldsCountSums) ,] IDCaseNumber Category SSN LastName FirstName FRED 0 0 0 0 -- View this message in context: http://www.nabble.com/Row-name-of-empty-string-issue-tf4250291.html#a12096455 Sent from the R help mailing list archive at Nabble.com. ______________________________________________ Rfirstname.lastname@example.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.