# how to not match partial names

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## how to not match partial names

 Dear friends, How do I stop partial matching of list names? e.g., x <- list(AAAA="aaaaa", BBBBB="bbbbb") is.null(x\$A)   #returns FALSE  even though there is no element A. if(is.null(x\$A))  {result <-  x\$BBBB} else {result <- x\$A} result   #is aaaa even though there is no x\$A element x <- list(CCCC="aaaaa", BBBBB="bbbbb") if(is.null(x\$A))  {result <-  x\$BBBB} else {result <- x\$A} result   #this is great x <- list(ABC="aaaaa", BBBBB="bbbbb") if(is.null(x\$A))  {result <-  x\$BBBB} else {result <- x\$A} result  #partial matches  and returns aaaa x <- list(ABC="abc", BBBBB="bbbbb",AA="aaaa") if(is.null(x\$A))  {result <-  x\$BBBB} else {result <- x\$A} result  #can not partial match, and thus returns bbbb x <- list(AAB="aab", BBBBB="bbbbb",AA="aaaa") if(is.null(x\$A))  {result <-  x\$BBBB} else {result <- x\$A} result #also can not partial match My need for this is that I have several functions that return lists and I am trying to extract AAAA if it exists, but something else if it does not. Thanks. Bill -- William Revelle http://personality-project.org/revelle.htmlProfessor http://personality-project.orgDepartment of Psychology             http://www.wcas.northwestern.edu/psych/Northwestern University http://www.northwestern.edu/Use R for psychology                       http://personality-project.org/rIt is 6 minutes to midnight http://www.thebulletin.org______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: how to not match partial names

 On Sun, May 8, 2011 at 11:09 AM, William Revelle <[hidden email]> wrote: > Dear friends, > > How do I stop partial matching of list names? > > e.g., > > x <- list(AAAA="aaaaa", BBBBB="bbbbb") > is.null(x\$A)   #returns FALSE  even though there is no element A. > > if(is.null(x\$A))  {result <-  x\$BBBB} else {result <- x\$A} > result   #is aaaa even though there is no x\$A element > x[["A"]]    -thomas -- Thomas Lumley Professor of Biostatistics University of Auckland ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.