On Aug 8, 2014, at 11:25 AM, Fix Ace wrote: > I have 16 files and would like to check the information of their first two > lines, what I did: > > >> ls(pattern="P_") > [1] "P_3_utr_source_data" "P_5_utr_source_data" > [3] "P_exon_per_gene_cds_source_data" "P_exon_per_gene_source_data" > [5] "P_exon_source_data" "P_first_exon_oncds_source_data" > [7] "P_first_intron_oncds_source_data" "P_first_intron_ongene_source_data" > [9] "P_firt_exon_ongene_source_data" "P_gene_cds_source_data" > [11] "P_gene_source_data" "P_intron_source_data" > [13] "P_last_exon_oncds_source_data" "P_last_exon_ongene_source_data" > [15] "P_last_intron_oncds_source_data" "P_last_intron_ongene_source_data" > >
The results from `ls()` are not actual R names but rather are character vectors. To "promote" a character value to an R language-name you need the `get` function: > >> for(i in ls(pattern="P_")){head(i, 2)} > for(i in ls(pattern="P_")){ head(get(i), 2)} # Should work. David. > It obviously does not work since nothing came out > > What I would like to see for the output is : > >> head(P_3_utr_source_data,2) > V1 > 1 1 > 2 1 >> head(P_5_utr_source_data,2) > V1 > 1 1 > 2 1 >> > . > > . > . > > > > Could anybody help me with this? > > Thank you very much for your time:) > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > 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. David Winsemius Alameda, CA, USA ______________________________________________ R-help@r-project.org mailing list 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.