On Jan 18, 2010, at 10:05 AM, Markus Mühlbacher wrote:
Hi community,
I want to count the occurrence of values within a dataframe.
data$names is a list of many names.
It's most likely a vector.
With namelist <- unique(data$names) I get all the existing names.
But the result is a factor, not a list of strings.
as.character(data$names) # would be a character vector, i.e., a
structure composed of "strings"
# You could make it a list if you wanted, but it's not clear that is
needed for your purposes.
I would then like to go trough all the names in a for-loop and count
their occurrence.
That shows your C programming background. Try instead the loop-less
method:
table(data$names)
BTW using "names" for an object's name is not a good programing
practice in R because there is a useful function by the same
name. ..... and then there is always the "dog" fortune.
--
David.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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