[R] tibble question with a mean

[Erin Hodgess]

Nice!

I didn’t realize you could do all that!

Thanks!


On Fri, Sep 21, 2018 at 10:32 AM William Dunlap <wdunlap using tibco.com> wrote:

> Since you are using tibbles you may want to go whole-hog and use the dplyr
> package as well.
>
> > xt <-
> tibble(x=LETTERS[1:4],y=1:4,z=log2(1:4),a=c("dog","cat","tree","ferret"))
> > xt %>% summarize(yMean=mean(y), zMean=mean(z), aLast=last(a))
> # A tibble: 1 x 3
>   yMean zMean aLast
>   <dbl> <dbl> <chr>
> 1   2.5  1.15 ferret
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Thu, Sep 20, 2018 at 5:50 PM, Erin Hodgess <erinm.hodgess using gmail.com>
> wrote:
>
>> Hello!
>>
>> Here is a toy tibble problem:
>>
>> xt <-
>> tibble(x=LETTERS[1:4],y=1:4,z=rnorm(4),a=c("dog","cat","tree","ferret"))
>> str(xt)
>> Classes ‘tbl_df’, ‘tbl’ and 'data.frame': 4 obs. of  4 variables:
>>  $ x: chr  "A" "B" "C" "D"
>>  $ y: int  1 2 3 4
>>  $ z: num  0.3246 0.0504 0.339 0.4872
>>  $ a: chr  "dog" "cat" "tree" "ferret"
>> #No surprise
>>  xt %>% mean
>> [1] NA
>> Warning message:
>> In mean.default(.) : argument is not numeric or logical: returning NA
>> #surprised!
>> mean(xt[2:3])
>> [1] NA
>> Warning message:
>> In mean.default(xt[2:3]) : argument is not numeric or logical: returning
>> NA
>>  xt[, 2:3] %>% mean
>> [1] NA
>> Warning message:
>> In mean.default(.) : argument is not numeric or logical: returning NA
>>
>> I have a feeling that I'm doing something silly wrong.  Has anyone run
>> into
>> this, please?  I saw something like this on this list, but didn't see a
>> solution.
>>
>> Thanks,
>> Erin
>>
>>
>> Erin Hodgess, PhD
>> mailto: erinm.hodgess using gmail.com
>>
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>>
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>
> --
Erin Hodgess, PhD
mailto: erinm.hodgess using gmail.com

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