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.sampleName <- function(fidFile) {
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# regular expression for directory separator (on unix: /+, on windows \+)
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# sadly .Platform$file.sep == "/" on both
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# create array of directories (each element == one directory)
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# -, : or something like that causes errors in names()
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# TODO: use make.names in future releases?
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sampleName <- gsub(pattern="[[:punct:]]|[[:space:]]", replacement="_",