[R] Doing dist on separate objects in a text file

[ScottDaniel]

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!

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