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, n
f Of Dimitri Liakhovitski
> Sent: Thursday, July 14, 2011 1:45 PM
> 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
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
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 2
iakhovitski
Sent: Thursday, July 14, 2011 1:45 PM
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 "
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 wo
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 wrote:
> Dmitri:
>
> as.matrix makes a matrix out of the dataframe t
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 <- as.formula(past
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 u
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 wrote:
>
> On Jul 14, 2011, at 3:05 PM, Dimitri Liakhovitski wrote:
>
>> Hello!
>>
>> I am aggregating using a formula
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):
myvars<-c("var1","var2
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 b
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