CODEWITHSUNDEEP
rdataframe
vaettchen
vaettchen

Reputation: 7659

cannot ls( myVector )

I read a data.frame from an sqlite table:

sql <- paste( "SELECT co_id, co_name, mkt_id FROM co" )
co <- dbGetQuery( db, sql )

and get a valid result (it seems):

ls( co )
[1] "co_id"   "co_name" "mkt_id"

I then subset some data:

x <- co[ co$mkt_id == 5, 2 ]
x
[1] "Dongbu"   "Green"    "Hanwha"   "Heungkuk" "Hyundai"  "LIG"     
[7] "Lotte"    "Meritz"   "Samsung"  "KFCC"     "NCUF"     "NACF"

Having difficulties assigning this variable x to a gcombobox, I was trying to find the reason and (this being the reason or not) found:

ls( x )
Error in as.environment(pos) : no item called "Dongbu" on the search list

Can somebody explain what this means? Shouldn't x be an ordinary vector, and "Dongbu" just be the first element?

sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] gWidgetsRGtk2_0.0-81 RSQLite_0.11.2       DBI_0.2-5           
[4] stringr_0.6.1        gWidgets_0.0-52      xtable_1.7-0        
[7] gridExtra_0.9.1      ggplot2_0.9.2.1     

loaded via a namespace (and not attached):
 [1] colorspace_1.1-1   dichromat_1.2-4    digest_0.5.2       gtable_0.1.1      
 [5] labeling_0.1       MASS_7.3-22        memoise_0.1        munsell_0.4       
 [9] plyr_1.7.1         proto_0.3-9.2      RColorBrewer_1.0-5 reshape2_1.2.1    
[13] RGtk2_2.20.25      scales_0.2.2       tools_2.15.2

Upvotes: 0

Views: 636

Answers (1)

Sven Hohenstein
Sven Hohenstein

Reputation: 81733

The first argument of the ls function, name, specifies the name of the environment. In General, this function is used to list the object in the specified environment.

If you run this function with x as first argument, the function looks for the environment "Dongbu", which is the first string in x, but fails to find the environment.

If you want to have a look of the structure of an object, you should use the str function. Try str(x).

Upvotes: 1

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