[R] What is the intended behavior, when subsetting using brackets [ ], when the subset criterion has NA's?

[Jeff Newmiller]

I suspect you were the victim of your own failure to use plain text email format as the Posting Guide warns you to do, or at least you let your email client try to convert your reply to HTML format... which often treats text on different lines as part of a single paragraph. As David pointed out, your version of the code had missing newlines.

On April 6, 2022 4:17:21 PM PDT, "Ebert,Timothy Aaron" <tebert using ufl.edu> wrote:
>Based on the OP's submission I pasted the following into R and tried to run it.
>
>Here is what I think was posted (comments removed):
>
>my_data <- 1:5
>my_data
>my_subset_criteria <- c( F, F, T, NA, NA) my_subset_criteria
>equals TRUE my_data[my_subset_criteria == T]
>my_subset_criteria == T) 
>
>Assuming that this is the right code I tried to run it. 
>The third line " my_subset_criteria <- c( F, F, T, NA, NA) my_subset_criteria" returns an error.
>
>Error: unexpected symbol in " my_subset_criteria <- c( F, F, T, NA, NA) my_subset_criteria"
>
>Regards,
>Tim
>
>-----Original Message-----
>From: Jeff Newmiller <jdnewmil using dcn.davis.ca.us> 
>Sent: Wednesday, April 6, 2022 5:22 PM
>To: r-help using r-project.org; Ebert,Timothy Aaron <tebert using ufl.edu>; Kelly Thompson <kt1572757 using gmail.com>; r-help using r-project.org
>Subject: Re: [R] What is the intended behavior, when subsetting using brackets [ ], when the subset criterion has NA's?
>
>[External Email]
>
>Mmmm, ESP on the blink.
>
>WHAT error? from which line of code?
>
>BTW see The R Inferno, section 8.2.32
>
>On April 6, 2022 1:52:47 PM PDT, "Ebert,Timothy Aaron" <tebert using ufl.edu> wrote:
>>I get an error with this:
>>my_subset_criteria <- c( F, F, T, NA, NA) my_subset_criteria
>>
>>
>>Tim
>>
>>-----Original Message-----
>>From: R-help <r-help-bounces using r-project.org> On Behalf Of Kelly Thompson
>>Sent: Wednesday, April 6, 2022 4:13 PM
>>To: r-help using r-project.org
>>Subject: [R] What is the intended behavior, when subsetting using brackets [ ], when the subset criterion has NA's?
>>
>>[External Email]
>>
>>I noticed that I get different results when subsetting using subset, compared to subsetting using  "brackets" when the subset criteria have NA's.
>>
>>Here's an example
>>
>>#START OF EXAMPLE
>>my_data <- 1:5
>>my_data
>>
>>my_subset_criteria <- c( F, F, T, NA, NA) my_subset_criteria
>>
>>#subsetting using subset returns the data where my_subset_criteria 
>>equals TRUE my_data[my_subset_criteria == T]
>>
>>#subsetting using brackets returns the data where my_subset_criteria 
>>equals TRUE, and also NA where my_subset_criteria is NA subset(my_data, 
>>my_subset_criteria == T)
>>
>>#END OF EXAMPLE
>>
>>This behavior is also mentioned here
>>https://urldefense.proofpoint.com/v2/url?u=https-3A__statisticaloddsand
>>ends.wordpress.com_2018_10_07_subsetting-2Din-2Dthe-2Dpresence-2Dof-2Dn
>>as_&d=DwICAg&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=NoPFkG
>>0n9RFRaacmiiQ9Hp1cGniz9ED5YGN11-Jh6rD_zkTTE8e5egsKqzQDMSEW&s=5lgkxT5A_M
>>SfElILNk1ZM3RGpcBWpMBu713av1DH1mk&e=
>>
>>Q. Is this the intended behavior when subsetting with brackets?
>>
>>Thank you!
>>
>>______________________________________________
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>>PLEASE do read the posting guide 
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>>and provide commented, minimal, self-contained, reproducible code.
>>
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>>R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see 
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>>PLEASE do read the posting guide 
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>>_posting-2Dguide.html&d=DwIFaQ&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsR
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>>Z9TXC&s=PKD9VZ1n0p_NfoQ2OvbmPEVr14lVwLZx09mOIWPRZmk&e=
>>and provide commented, minimal, self-contained, reproducible code.
>
>--
>Sent from my phone. Please excuse my brevity.

-- 
Sent from my phone. Please excuse my brevity.