[R] [FORGED] Re: get() return nothing

[Rolf Turner]

On 14/02/17 05:50, Fix Ace via R-help wrote:

> Well, I am not trying to print anything. I just would like to get the dimension information for all the dataframes I created. Could you please help me to develop the script?
> Thanks.
> Ace

Yes you *are* trying to print something.  You are trying to print the 
dimension information, i.e. dim(get(i))!!! For Pete's sake (a) *think* 
about what you are doing and (b) *try* example that Duncan suggested to you.

cheers,

Rolf Turner
>
>     On Saturday, February 11, 2017 7:53 PM, Duncan Murdoch <murdoch.duncan at gmail.com> wrote:
>
>
>  On 11/02/2017 1:33 PM, Fix Ace via R-help wrote:
>> Hello, there,
>> I wrote a loop to check the dimension of all the .txt dataframes:> ls()
>>   [1] "actualpca.table" "b4galnt2"        "b4galnt2.txt"    "data"
>>   [5] "galnt4"          "galnt4.txt"      "galnt5"          "galnt5.txt"
>>   [9] "galnt6"          "galnt6.txt"      "glyco"          "glyco.txt"
>> [13] "i"              "mtscaled"        "newsig.table"    "nicepca"
>> [17] "pca"            "sig.txt"        "st3gal3"        "st3gal3.txt"
>> [21] "st3gal5"        "st3gal5.txt"    "st6gal1"        "st6gal1.txt"
>>> for(i in ls(pattern="txt")){dim(get(i))}
>>>
>> If I check individual ones, they are ok:
>>> dim(get("galnt4.txt"))
>> [1] 8 3
>>>
>> could anyone help me to figure out why it did not work with a loop?
>> Thanks a lot!
>
> It's the difference between
>
> for (i in 1:10) i
>
> (which prints nothing) and
>
> for (i in 1:10) print(i)
>
> Duncan Murdoch
>
>
>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276