Thanks for pointing that out.
Mike
On Tue, Mar 26, 2013 at 6:53 PM, David Winsemius wrote:
>
> On Mar 26, 2013, at 2:51 PM, C W wrote:
>
> > Dear list,
> >
> > I am a little confused as to when to use apply, sapply, tapply, vapply,
> > replicate. I've encountered this several times,
> > This is
On Mar 26, 2013, at 2:51 PM, C W wrote:
> Dear list,
>
> I am a little confused as to when to use apply, sapply, tapply, vapply,
> replicate. I've encountered this several times,
> This is time, this is what I am working on,
>
> mat <- matrix(c(seq(from=1, to=10), rnorm(10)), ncol=2)
>
> a=1;
Hello,
The correct syntax would be
sapply(1:10, function(i) newfun(x=mat[i, 1], y=mat[i, 2], a=a, b=b))
Hope this helps,
Rui Barradas
Em 26-03-2013 21:51, C W escreveu:
Dear list,
I am a little confused as to when to use apply, sapply, tapply, vapply,
replicate. I've encountered this sev
Dear list,
I am a little confused as to when to use apply, sapply, tapply, vapply,
replicate. I've encountered this several times,
This is time, this is what I am working on,
mat <- matrix(c(seq(from=1, to=10), rnorm(10)), ncol=2)
a=1; b=5
newfun <- function(x, y, a, b)
{
x*y+a+b
}
sap
unlap
TIBCO Spotfire
From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] on behalf of
csrabak [cra...@acm.org]
Sent: Wednesday, July 13, 2011 6:20 AM
To: r-h...@stat.math.ethz.ch
Subject: Re: [R] when to use `which'?
Em 12/7/2011 17:29, David Winsemius escreveu:
>
[snipped
Em 12/7/2011 17:29, David Winsemius escreveu:
[snipped]
If you have millions of records and tens of thousands of NA's (say ~ 1%
of the data), imagine what your console looks like if you try to pick
out records from one day and get 10,000 where you were expecting 100. A
real PITA when you are
On Tue, Jul 12, 2011 at 1:17 PM, Sam Steingold wrote:
> when do I need to use which()?
See ?which
For examples, try:
example(which)
>> a <- c(1,2,3,4,5,6)
>> a
> [1] 1 2 3 4 5 6
>> a[a==4]
> [1] 4
>> a[which(a==4)]
> [1] 4
>> which(a==4)
> [1] 4
>> a[which(a>2)]
> [1] 3 4 5 6
>> a[a>2]
> [1] 3
On Jul 12, 2011, at 4:17 PM, Sam Steingold wrote:
when do I need to use which()?
a <- c(1,2,3,4,5,6)
a
[1] 1 2 3 4 5 6
a[a==4]
[1] 4
a[which(a==4)]
[1] 4
which(a==4)
[1] 4
a[which(a>2)]
[1] 3 4 5 6
a[a>2]
[1] 3 4 5 6
seems unnecessary...
It is unnecessary when `a` is a toy ca
Well ...
which(a==4)^2
??
-- Bert
On Tue, Jul 12, 2011 at 1:17 PM, Sam Steingold wrote:
> when do I need to use which()?
>> a <- c(1,2,3,4,5,6)
>> a
> [1] 1 2 3 4 5 6
>> a[a==4]
> [1] 4
>> a[which(a==4)]
> [1] 4
>> which(a==4)
> [1] 4
>> a[which(a>2)]
> [1] 3 4 5 6
>> a[a>2]
> [1] 3 4 5 6
>>
>
when do I need to use which()?
> a <- c(1,2,3,4,5,6)
> a
[1] 1 2 3 4 5 6
> a[a==4]
[1] 4
> a[which(a==4)]
[1] 4
> which(a==4)
[1] 4
> a[which(a>2)]
[1] 3 4 5 6
> a[a>2]
[1] 3 4 5 6
>
seems unnecessary...
--
Sam Steingold (http://sds.podval.org/) on CentOS release 5.6 (Final) X
11.0.60900031
htt
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