[R] How to force R to print 2 decimal places in column of a data.frame?

[Lesandro]

Hi Marc Schwartz,

Your suggestion solved my problem.

Thanks you.

--- Em qui, 11/6/09, Marc Schwartz <marc_schwartz at me.com> escreveu:

> De: Marc Schwartz <marc_schwartz at me.com>
> Assunto: Re: [R] How to force R to print 2 decimal places in column of a data.frame?
> Para: "Lesandro" <lesandrop at yahoo.com.br>
> Cc: r-help at r-project.org
> Data: Quinta-feira, 11 de Junho de 2009, 15:45
> 
> On Jun 11, 2009, at 11:48 AM, Lesandro wrote:
> 
> > 
> > How to force R to print 2 decimal places in column of
> a data.frame? I tried to do so:
> > 
> > x = inp(format(rounf(inp$Tamanho, 2), nsmall = 2),)
> > 
> > where "INP" is data.frame and "Size" is the name of
> column. But has error:
> > 
> > Error in eval.with.vis(expr, envir, enclos) :
> >  could not find function "inp"
> > 
> > Lesandro
> 
> 
> 
> Your code and description above appear to have some typos
> in it and the use of the round() and format() functions are
> not what you want here.
> 
> You code has inp(...), where R is presuming that you are
> referring to a function called 'inp', hence the error
> message, since the function does not exist.
> 
> Better to use sprintf() with an appropriate format
> specifier:
> 
> set.seed(1)
> vec <- rnorm(10)
> 
> > vec
>  [1] -0.6264538  0.1836433 -0.8356286 
> 1.5952808  0.3295078 -0.8204684
>  [7]  0.4874291  0.7383247  0.5757814
> -0.3053884
> 
> > sprintf("%.2f", vec)
>  [1] "-0.63" "0.18"  "-0.84" "1.60"  "0.33" 
> "-0.82" "0.49"  "0.74"
>  [9] "0.58"  "-0.31"
> 
> See ?sprintf for more information.  Note that the
> presumption here is that you want to output the numeric
> values to a formatted character vector for display purposes,
> perhaps in a table, etc.
> 
> So if your actual data frame is called 'INP' and the column
> is called 'Size', you would use:
> 
>   sprintf("%.2f", INP$Size)
> 
> 
> HTH,
> 
> Marc Schwartz
> 
> 


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