[R] Cluster graphs

[Michael HART]

I posted this to the sci.math newsgroup but didn't get any responses so I
was hoping someone here could help.

I have a number of items with "distances" of differences between each other.
What I want to do is to plot each item on a two dimensional plot such that
the positions on the plot indicate the approximate distance between each
item.

What I want to look at, basically, is a map with cities on it but all I have
is city pairs with distances between them.  How do I go between the pairs of
items with distances to a two dimensional map.

some sample data follows

>From To Distance
ItemA ItemA 0
ItemA ItemB 54
ItemA ItemC 43
ItemA ItemD 47
ItemA ItemE 44
ItemA ItemF 63
ItemA ItemG 35
ItemA ItemH 44
ItemA ItemI 43
ItemA ItemJ 79
ItemB ItemA 54
ItemB ItemB 0
ItemB ItemC 55
ItemB ItemD 61
ItemB ItemE 65
ItemB ItemF 72
ItemB ItemG 49
ItemB ItemH 57
ItemB ItemI 54
ItemB ItemJ 68
ItemC ItemA 43
ItemC ItemB 55
ItemC ItemC 0
ItemC ItemD 53
ItemC ItemE 63
ItemC ItemF 74
ItemC ItemG 48
ItemC ItemH 31
ItemC ItemI 59
ItemC ItemJ 58
ItemD ItemA 47
ItemD ItemB 61
ItemD ItemC 53
ItemD ItemD 0
ItemD ItemE 47
ItemD ItemF 52
ItemD ItemG 47
ItemD ItemH 54
ItemD ItemI 50
ItemD ItemJ 85
ItemE ItemA 44
ItemE ItemB 65
ItemE ItemC 63
ItemE ItemD 47
ItemE ItemE 0
ItemE ItemF 65
ItemE ItemG 48
ItemE ItemH 57
ItemE ItemI 49
ItemE ItemJ 92
ItemF ItemA 63
ItemF ItemB 72
ItemF ItemC 74
ItemF ItemD 52
ItemF ItemE 65
ItemF ItemF 0
ItemF ItemG 62
ItemF ItemH 70
ItemF ItemI 58
ItemF ItemJ 103
ItemG ItemA 35
ItemG ItemB 49
ItemG ItemC 48
ItemG ItemD 47
ItemG ItemE 48
ItemG ItemF 62
ItemG ItemG 0
ItemG ItemH 47
ItemG ItemI 40
ItemG ItemJ 80
ItemH ItemA 44
ItemH ItemB 57
ItemH ItemC 31
ItemH ItemD 54
ItemH ItemE 57
ItemH ItemF 70
ItemH ItemG 47
ItemH ItemH 0
ItemH ItemI 54
ItemH ItemJ 63
ItemI ItemA 43
ItemI ItemB 54
ItemI ItemC 59
ItemI ItemD 50
ItemI ItemE 49
ItemI ItemF 58
ItemI ItemG 40
ItemI ItemH 54
ItemI ItemI 0
ItemI ItemJ 85
ItemJ ItemA 79
ItemJ ItemB 68
ItemJ ItemC 58
ItemJ ItemD 85
ItemJ ItemE 92
ItemJ ItemF 103
ItemJ ItemG 80
ItemJ ItemH 63
ItemJ ItemI 85
ItemJ ItemJ 0

Michael Hart


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