How to read in OTHER file with read.csv in R, if first file is not found? -

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i using r read in file, therefore use read.csv. files come dataset , tagged date. however, dates missing. date x, want read in file "x". because files missing, r gives me "error in file(file, "rt") : cannot open connection". instead, want r automatically read in file "x-1" if "x" nonexistent (or "x-2" if "x-1" nonexistent etcetera). thus, looking kind of "iferror" statement around this. not find kind of statement, know how detect "rt" , act on it? regards, margot


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