[R] subset

Stefan Grosse singularitaet at gmx.net
Mon Apr 23 16:41:25 CEST 2007

What format does your date have? This is essential here. However it must
be something like subset(yourdata, year %in% 2004) how to extract the
year from your date you must find out yourself... (depending on the
dates format...)

ever considered reading an introductory text?
find some here:


elyakhlifi mustapha wrote:
> hi,
> ok I understand how to use the subset function but sometimes I need to use it to extract data by date and its format it isn't so easy (like below)
> for example like in using SQL I thougth that it was possible to write "%/2004" but it doesn't run. Can you help me please about this?
>  subset(don, Date_O in "%/2004", select = c(Annee_O, Date_O))
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