Well, I obviously don't use it either, as I'm just quoting the docs.
I either use by(), or tapply().
-- Bert
Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374
"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
Clifford Stoll
On Thu,
Bert: using the sample data frame from below, try to interpret the output of
this:
aggregate( dat[,1:2], dat[,"g",drop=FALSE, FUN=function(x){print(x);class(x)})
The help text you quote is probably not as clear as it should be. Would the
following be better?
"... and FUN is applied to each col
On Mar 4, 2015, at 2:02 PM, Typhenn Brichieri-Colombi via R-help wrote:
> Hello,
>
> I am trying to use the following custom function in an aggregatefunction, but
> cannot get R to recognize my data. I’ve read the help on function()and on
> aggregate() but am unable to solve my problem. How ca
That's not what ?aggregate says:
"aggregate.data.frame is the data frame method. If x is not a data
frame, it is coerced to one, which must have a non-zero number of
rows. Then, each of the variables (columns) in x is split into subsets
of cases (rows) of identical combinations of the components o
I don't see your point. No matter which version of aggregate you use, FUN is
applied to vectors. Those vectors may be columns in a data frame or not, but
FUN is always given one vector at a time by aggregate.
---
Jeff Newmill
Sorry, Jeff. aggregate() is generic.
>From ?aggregate:
"## S3 method for class 'data.frame'
aggregate(x, by, FUN, ..., simplify = TRUE)"
Cheers,
Bert
Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374
"Data is not information. Information is not knowledge. And knowledge
is certainl
The aggregate function applies FUN to vectors, not data frames. For example,
the default "mean" function accepts a vector such as a column in a data frame
and returns a scalar (well, a vector of length 1). Aggregate then calls this
function once for each piece of the column(s) you give it. Your
What do you think dat$a is?
I recommend that you spend some time with an R tutorial if you plan to
use R. Your code is pretty bad. Examples: use of the ifelse
construction instead of if ... else; return()
Cheers,
Bert
Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374
"Data is not i
Hello,
I am trying to use the following custom function in an aggregatefunction, but
cannot get R to recognize my data. I’ve read the help on function()and on
aggregate() but am unable to solve my problem. How can I get R torecognize the
data inputs for the custom function nested within aggrega
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