[R] subset

[Thomas Lumley]

On Mon, 26 Mar 2007, Marc Schwartz wrote:

> Sergio,
>
> Please be sure to cc: the list (ie. Reply to All) with follow up
> questions.
>
> In this case, you would use %in% with a negation:
>
> NewDF <- subset(DF, (var1 == 0) & (var2 == 0) & (!var3 %in% 2:3))
>

Probably a typo: should be !(var3 %in% 2:3) rather than (!var %in% 2:3)

      -thomas

> See ?"%in%" for more information.
>
> HTH,
>
> Marc
>
> On Mon, 2007-03-26 at 17:30 +0200, Sergio Della Franca wrote:
>> Ok, this run correctly.
>>
>> Another question for you:
>>
>> I want to put more than one condition for var3, i.e.:
>> I like to create a subset when:
>>  - var1=0
>>  - var2=0
>>  - var3 is different from 2 and from 3.
>>
>> Like you suggested, i perform this code:
>> NewDF <- subset(DF, (var1 == 0) & (var2 == 0) & (var 3 != 2)) & (var
>> 3 != 3))
>>
>> There is a method to combine (var 3 != 2)) & (var 3 != 3)) in one
>> condition?
>>
>> Thank you.
>>
>> Sergio
>>
>>
>>
>> 2007/3/26, Marc Schwartz <marc_schwartz at comcast.net>:
>>         On Mon, 2007-03-26 at 17:02 +0200, Sergio Della Franca wrote:
>>        > Dear R-Helpers,
>>        >
>>        > I want to make a subset from my data set.
>>        >
>>        > I'd like to perform different condition for subset.
>>        >
>>        > I.e.:
>>        >
>>        > I like to create a subset when:
>>        > - var1=0
>>        > - var2=0
>>        > - var3 is different from 2.
>>        >
>>        > How can i develop a subset under this condition?
>>        >
>>        > Thank you in advance.
>>        >
>>        > Sergio Della Franca.
>>
>>         See ?subset
>>
>>         Something along the lines of the following should work:
>>
>>         NewDF <- subset(DF, (var1 == 0) & (var2 == 0) & (var 3 != 0))
>>
>>         HTH,
>>
>>         Marc Schwartz
>
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Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle