[R] partial matches across rows not columns

[RCulloch]

Hi R users,

I am trying to omit rows of data based on partial matches an example of my
data (seal_dist) is below:

A quick break down of my coding and why I need to answer this - I am dealing
with a colony of seals where for example A1 is a female with pup and A1.1 is
that female's pup, the important part of the data here is DIST which tells
the distance between one seal (ID) and another (TO_ID). What I want to do is
take a mean for these data for a nearest neighbour analysis but I want to
omit any cases where there is the distance between a female and her pup,
i.e. in the previous e.g. omit rows where A1 and A1.1 occur. 

I have looked at grep and pmatch but these appear to work across columns and
don't appear to do what I'm looking to do, 

If anyone can point me in the right direction, I'd be most greatful,

Best wishes,

Ross 


    FROM TO     DIST    ID HR DD MM YY ANIMAL DAY TO_ID TO_ANIMAL
2      1  2  4.81803    A1  1 30  9  9      1   1 MALE1        12
3      1  3  2.53468    A1  1 30  9  9      1   1    A2         3
4      1  4  7.57332    A1  1 30  9  9      1   1  A1.1         7
5      1  1  7.57332  A1.1  1 30  9  9      7   1    A1         1
6      1  2  7.89665  A1.1  1 30  9  9      7   1 MALE1        12
7      1  3  6.47847  A1.1  1 30  9  9      7   1    A2         3
9      1  1  2.53468    A2  1 30  9  9      3   1    A1         1
10     1  2  2.59051    A2  1 30  9  9      3   1 MALE1        12
12     1  4  6.47847    A2  1 30  9  9      3   1  A1.1         7
13     1  1  4.81803 MALE1  1 30  9  9     12   1    A1         1
15     1  3  2.59051 MALE1  1 30  9  9     12   1    A2         3
16     1  4  7.89665 MALE1  1 30  9  9     12   1  A1.1         7
17     1  1  3.85359    A1  2 30  9  9      1   1 MALE1        12
19     1  3  4.88826    A1  2 30  9  9      1   1    A2         3
20     1  4  7.25773    A1  2 30  9  9      1   1  A1.1         7
21     1  1  9.96431  A1.1  2 30  9  9      7   1 MALE1        12
22     1  2  7.25773  A1.1  2 30  9  9      7   1    A1         1
23     1  3  5.71725  A1.1  2 30  9  9      7   1    A2         3
25     1  1  8.73759    A2  2 30  9  9      3   1 MALE1        12
26     1  2  4.88826    A2  2 30  9  9      3   1    A1         1
28     1  4  5.71725    A2  2 30  9  9      3   1  A1.1         7
30     1  2  3.85359 MALE1  2 30  9  9     12   1    A1         1
31     1  3  8.73759 MALE1  2 30  9  9     12   1    A2         3
32     1  4  9.96431 MALE1  2 30  9  9     12   1  A1.1         7
33     1  1  7.95399    A1  3 30  9  9      1   1 MALE1        12
35     1  3  0.60443    A1  3 30  9  9      1   1  A1.1         7
36     1  4  1.91136    A1  3 30  9  9      1   1    A2         3
37     1  1  8.29967  A1.1  3 30  9  9      7   1 MALE1        12
38     1  2  0.60443  A1.1  3 30  9  9      7   1    A1         1
40     1  4  1.43201  A1.1  3 30  9  9      7   1    A2         3
41     1  1  9.71659    A2  3 30  9  9      3   1 MALE1        12
42     1  2  1.91136    A2  3 30  9  9      3   1    A1         1
43     1  3  1.43201    A2  3 30  9  9      3   1  A1.1         7
46     1  2  7.95399 MALE1  3 30  9  9     12   1    A1         1
47     1  3  8.29967 MALE1  3 30  9  9     12   1  A1.1         7
48     1  4  9.71659 MALE1  3 30  9  9     12   1    A2         3
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