[R] How to round only one df row & how to keep 3rd sigdif if zero

[Crombie, Burnette N]

Thanks for taking the time to share your thoughts, PP.  I always extensively google & search before resorting to R forum.  In my real dataset, not in the example I created for the forum, I had tried converting the matrix to a dataframe but it retained the unwanted format.  And, these tables are being used in a report generated with the rtf package, so I have to get the format right for outside the console.  Because of another unrelated issue, though, I had to use a different approach to creating the dataframe with counts/rates added, so the issue was circumvented.  Cheers.

-----Original Message-----
From: PIKAL Petr [mailto:petr.pikal at precheza.cz] 
Sent: Thursday, June 18, 2015 10:56 AM
To: Crombie, Burnette N; r-help at r-project.org
Subject: RE: [R] How to round only one df row & how to keep 3rd sigdif if zero

Hi

You need to distinguish between an object and printing an object on console. When you print an object you can use several options for formating.

?sprintf, ?formatC

> formatC(t(a), digits=1, format="f")
      [,1]   [,2]   [,3]
count "1.0"  "2.0"  "3.0"
rate  "16.7" "33.3" "50.0"
>

Also when you transpose "a" the result is not data frame but matrix.

> str(t(a))
 num [1:2, 1:3] 1 16.7 2 33.3 3 50
 - attr(*, "dimnames")=List of 2
  ..$ : chr [1:2] "count" "rate"
  ..$ : NULL
> str(a)
'data.frame':   3 obs. of  2 variables:
 $ count: num  1 2 3
 $ rate : num  16.7 33.3 50
>

If you used google or other internet search options you would get plenty of results yourself.

try "formatting numbers R"

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of 
> bcrombie
> Sent: Thursday, June 18, 2015 3:09 PM
> To: r-help at r-project.org
> Subject: [R] How to round only one df row & how to keep 3rd sigdif if 
> zero
>
> # How do I round only one row of a dataframe?
> # After transposing a dataframe of counts & rates, all values took on 
> the most # of signif digits in the dataset (rates), but I want counts 
> to remain only one digit.
> # Also, how can I keep 3 significant digits in R when the 3rd is a 
> zero?
> count <- c(1, 2, 3)
> rate <- c(16.7, 33.3, 50.0)
> a <- data.frame(count,rate)
> a
> # count rate
> # 1     1 16.7
> # 2     2 33.3
> # 3     3 50.0
> a <- t(a)
> a
> # [,1] [,2] [,3]
> # count  1.0  2.0    3
> # rate  16.7 33.3   50
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/How-to-
> round-only-one-df-row-how-to-keep-3rd-sigdif-if-zero-tp4708819.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting- 
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> reproducible code.

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