subsetting a data frame

Hi Jorge
I got the rows where V3 looks like this  10:10:10;  Ithe sum here is 30 and not 10.
I want the rows where the sum is 10 for exaple 5:5:0 and 2:2:6

thanks
Joseph


----- Original Message ----
From: Jorge Ivan Velez <jorgeivanvelez at gmail.com>
To: joseph <jdsandjd at yahoo.com>
Sent: Saturday, September 6, 2008 10:43:09 AM
Subject: Re: [R] subsetting a data frame



Dear Joseph,

Try


 DF[sapply(strsplit(as.character(DF$V3), ":"),
          function(i) all(as.numeric(i) == 10)), ]

HTH,

Jorge



On Sat, Sep 6, 2008 at 1:24 PM, joseph <jdsandjd at yahoo.com> wrote:

Hello
How can I change the function to get the rows with the sum (x+y+z) = 10?
Thank you very much
Joseph




----- Original Message ----
From: Marc Schwartz <marc_schwartz at comcast.net>
To: joseph <jdsandjd at yahoo.com>
Cc: r-help at r-project.org
Sent: Wednesday, September 3, 2008 3:24:58 PM
Subject: Re: [R] subsetting a data frame

on 09/03/2008 05:06 PM joseph wrote:

I have a data frame that looks like this:
V1 V2 V3
a    b    0:1:12
d    f    1:2:1
c    d    1:0:9
where V3 is in the form x:y:z
Can someone show me how to subset the rows where the values of x, y and z <= 10:
V1 V2 V3
d    f    1:2:1
c    d    1:0:9
Thanks
Joseph

How about this:

DF[sapply(strsplit(as.character(DF$V3), ":"),

          function(i) all(as.numeric(i) <= 10)), ]
 V1 V2    V3
2  d  f 1:2:1
3  c  d 1:0:9


Basically, use strsplit() to break apart 'V3':

strsplit(as.character(DF$V3), ":")

[[1]]
[1] "0"  "1"  "12"

[[2]]
[1] "1" "2" "1"

[[3]]
[1] "1" "0" "9"


The use sapply() to crawl the list, converting the elements to numerics
and do the value comparison:

sapply(strsplit(as.character(DF$V3), ":"),

       function(i) all(as.numeric(i) <= 10))
[1] FALSE  TRUE  TRUE


The above then returns the logical vector to subset the rows of 'DF'.

HTH,

Marc Schwartz




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