Perhaps split() directly or more abstractly tapply() from base or one of the d_ply() from plyr?
Michael On Sat, Nov 5, 2011 at 7:20 PM, ScottDaniel <scottdanie...@gmail.com> wrote: > So I have a text file that looks like this: > "Label" "X" "Y" "Slice" > 1 "Field_1_R3D_D3D_PRJ_w617.tif" 348 506 1 > 2 "Field_1_R3D_D3D_PRJ_w617.tif" 359 505 1 > 3 "Field_1_R3D_D3D_PRJ_w617.tif" 356 524 1 > 4 "Field_1_R3D_D3D_PRJ_w617.tif" 2 0 1 > 5 "Field_1_R3D_D3D_PRJ_w617.tif" 412 872 1 > 6 "Field_1_R3D_D3D_PRJ_w617.tif" 422 863 1 > 7 "Field_1_R3D_D3D_PRJ_w617.tif" 429 858 1 > 8 "Field_1_R3D_D3D_PRJ_w617.tif" 429 880 1 > 9 "Field_1_R3D_D3D_PRJ_w617.tif" 437 865 1 > 10 "Field_1_R3D_D3D_PRJ_w617.tif" 447 855 1 > 11 "Field_1_R3D_D3D_PRJ_w617.tif" 450 868 1 > 12 "Field_1_R3D_D3D_PRJ_w617.tif" 447 875 1 > 13 "Field_1_R3D_D3D_PRJ_w617.tif" 439 885 1 > 14 "Field_1_R3D_D3D_PRJ_w617.tif" 2 8 1 > > What it represents are the locations of centromeres per nucleus in a > microscope image. What I need to do is do a dist() on each grouping (the > grouping being separated by the low values of x and y's) and then compute an > average. The part that I'm having trouble with is writing code that will > allow R to separate these objects. Do I have to find some way of creating > separate data frames for each object? Or is there a way to parse the file > and generate a single data frame of all the pairwise distances? Any > suggestions or example code would be much appreciated. Thanks! > > -- > View this message in context: > http://r.789695.n4.nabble.com/Doing-dist-on-separate-objects-in-a-text-file-tp3994515p3994515.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > ______________________________________________ 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.