[datatable-help] =?utf-8?Q?=60with=3DF=60_?=in the `i` Argument

[Arunkumar Srinivasan]

Michael,

Thanks. Replacing order with base:::order seems to give the right result. So, I’d say this is a case that seem to have escaped current tests. So, yes, bug. Could you please file as one here?


Arun

From: Michael Smith my.r.help at gmail.com
Reply: Michael Smith my.r.help at gmail.com
Date: June 15, 2014 at 5:02:46 AM
To: G See gsee000 at gmail.com
Cc: datatable-help at lists.r-forge.r-project.org datatable-help at lists.r-forge.r-project.org
Subject:  Re: [datatable-help] `with=F` in the `i` Argument  

Devs,  

Is this a bug? It works in 1.9.2 but not in the 1.9.3 development version:  

DT <- data.table(a = 1:4, b = 8:5)  
for (i in c("a", "b"))  
print(DT[order(DT[, i, with = FALSE])])  

Error in forder(DT, DT[, i, with = FALSE]) :  
Column '1' is type 'list' which is not supported for ordering currently.  


Thanks,  

M  


On 05/31/2014 12:44 PM, G See wrote:  
> Hi Michael,  
>  
> I would use get()  
>  
> DT <- data.table(a = 1:4, b = 8:5)  
> for (i in c("a", "b"))  
> print(DT[order(get(i))])  
>  
> For what it's worth, your solution doesn't seem to work in data.table  
> 1.9.3 (svn rev. 1278):  
>  
>> for (i in c("a", "b"))  
> + print(DT[order(DT[, i, with = FALSE])])  
> Error in forder(DT, DT[, i, with = FALSE]) :  
> Column '1' is type 'list' which is not supported for ordering currently.  
>  
>  
> HTH,  
> Garrett  
>  
> On Fri, May 30, 2014 at 11:01 PM, Michael Smith <my.r.help at gmail.com> wrote:  
>> All,  
>>  
>> I'm trying to order the rows according to several columns at a time:  
>>  
>> DT <- data.table(a = 1:4, b = 8:5)  
>> for (i in c("a", "b"))  
>> print(DT[order(i), with = FALSE])  
>>  
>> It doesn't work, since `with` seems to be about the `j` argument, but  
>> not the `i` argument, according to `?data.table`.  
>>  
>> I found the following workaround, but wonder whether there is a more  
>> elegant way to do it:  
>>  
>> for (i in c("a", "b"))  
>> print(DT[order(DT[, i, with = FALSE])])  
>>  
>> Thanks,  
>> M  
>> _______________________________________________  
>> datatable-help mailing list  
>> datatable-help at lists.r-forge.r-project.org  
>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help  
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