capm capm - 3 months ago 43
R Question

R list files with multiple conditions

I want to list all files in a directory that met certain conditions (date and currency). So with only one condition the argument

pattern
in
list.files
works well:

file.ls <- list.files(path='~/DATA/PiP/Curvas/',pattern='20130801')


For multiple conditions I've tried:

file.ls <- list.files(path='~/DATA/PiP/Curvas/',pattern=c('20130801','USD'))


But had the same result as the first one. Is there a way to have multiple criteria in
pattern
argument of
list.files
?

Answer
 Filter(function(x) grepl("USD", x), file.ls)

alternatively, you could construct a regular expression for pattern that only matches filenames containing both strings, but that's a wizard's game.

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