I am working with .bed .bim and .fam files from the Drosophila Genetic Reference Panel. I only used a subset of the 205 individuals in the dataset and am trying to filter these out in PLINK using the --filter comand, however I keep getting an error, indicating that my .txt file which specifies which individuals to filter has fewer tokens then expected. Can anyone help in identifying what is causing this error?
plink --bfile dgrp2 --filter incl_dgrplines.txt 1 --no-pheno --make-bed --out dgrp3 PLINK v1.90b3.43 64-bit (13 Nov 2016) https://www.cog-genomics.org/plink2 (C) 2005-2016 Shaun Purcell, Christopher Chang GNU General Public License v3 Logging to dgrp3.log. Options in effect: --bfile dgrp2 --filter incl_dgrplines.txt 1 --make-bed --no-pheno --out dgrp3 3882 MB RAM detected; reserving 1941 MB for main workspace. 4438427 variants loaded from .bim file. 205 people (205 males, 0 females) loaded from .fam. Error: Line 1 of --filter file has fewer tokens than expected.