For a little lateral thinking, consider the use of . on the LHS. That could
play out as follows:
myvars - c(Ozone,Wind)
f - . ~ Month
j - union(all.vars(f[[3]]), myvars)
aggregate(. ~ Month, data=airquality[j], mean, na.rm=T)
MonthOzone Wind
1 5 23.61538 11.457692
2 6
formula - based on an existing object
(vector)
Thanks a lot!
actually, what I tried to do is very simple - just passing tons of
variable names into the formula. Maybe that get thing suggested by
Bert would work...
Dimitri
On Thu, Jul 14, 2011 at 4:01 PM, David Winsemius dwinsem
On Jul 15, 2011, at 15:06 , peter dalgaard wrote:
For a little lateral thinking, consider the use of . on the LHS. That could
play out as follows:
myvars - c(Ozone,Wind)
f - . ~ Month
j - union(all.vars(f[[3]]), myvars)
aggregate(. ~ Month, data=airquality[j], mean, na.rm=T)
Month
Hello!
I am aggregating using a formula in aggregate - of the type:
aggregate(cbind(var1,var2,var3)~factor1+factor2,sum,data=mydata)
However, I actually have an object (vector of my variables to be aggregated):
myvars-c(var1,var2,var3)
I'd like my aggregate formula (its cbind part) to be able
On Jul 14, 2011, at 3:05 PM, Dimitri Liakhovitski wrote:
Hello!
I am aggregating using a formula in aggregate - of the type:
aggregate(cbind(var1,var2,var3)~factor1+factor2,sum,data=mydata)
However, I actually have an object (vector of my variables to be
aggregated):
Thank you, David, it does work.
Could you please explain why? What exactly does changing it to as matrix do?
Thank you!
Dimitri
On Thu, Jul 14, 2011 at 3:25 PM, David Winsemius dwinsem...@comcast.net wrote:
On Jul 14, 2011, at 3:05 PM, Dimitri Liakhovitski wrote:
Hello!
I am aggregating
Dmitri:
Look at my vars from myvars-c(value1,value2)
It's just a character vector of length 2!
You can't cbind a character vector of length 2! These are not
references/pointers.
It's not at all clear to me what you ultimately want to do, but IF
it's: pass a character vector of names to be used
Dmitri:
as.matrix makes a matrix out of the dataframe that is passed to it.
As a further note I attempted and failed for reasons that are unclear
to me to construct a formula that would (I hoped) preserve the column
names which are being mangle in the posted effort:
form -
Thanks a lot!
actually, what I tried to do is very simple - just passing tons of
variable names into the formula. Maybe that get thing suggested by
Bert would work...
Dimitri
On Thu, Jul 14, 2011 at 4:01 PM, David Winsemius dwinsem...@comcast.net wrote:
Dmitri:
as.matrix makes a matrix out
David - I tried exactly the thing you did (and after that asked my
question to the forum):
form - as.formula(paste(
cbind(,
paste( myvars, collapse=,),
) ~ group+mydate,
sep= ) )
And it did not work - although
To: David Winsemius
Cc: r-help
Subject: Re: [R] cbind in aggregate formula - based on an existing object
(vector)
Thanks a lot!
actually, what I tried to do is very simple - just passing tons of
variable names into the formula. Maybe that get thing suggested by
Bert would work...
Dimitri
On Thu, Jul
Hi:
I think Bill's got the right idea for your problem, but for the fun of
it, here's how Bert's suggestion would play out:
# Kind of works, but only for the first variable in myvars...
aggregate(get(myvars) ~ group + mydate, FUN = sum, data = example)
group mydate get(myvars)
1 group1
12 matches
Mail list logo
