>
> On Nov 5, 2011, at 7:20 PM, ScottDaniel 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.
>
> I'm having trouble figuring out what you mean by "separating the
> objects". Each row is a separate reading, and I think you just want
> pairwise distances, right?
What I mean is that rows 1-3 represent one group of centromeres and
rows 5-13 represent a second group. So I want to do a separate dist on
each group (i.e. I want a pair wise distance for rows 1 and 3 but not
1 and 12). Does that clear thing up?
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