How to input a diameter distance structure
Let f: {1,…,12}→ Z12 be a tone row,
then its diameter distances are the distances of f(7) and f(1), of f(8) and
f(2), …, and of f(12) and f(6).
Let vi be the distance of f(i) and f(i+6), 1≤
i≤ 6. They all belong to the set {1,…,6}. The diameter
distance structure is the D6-orbit of the vector
(v1,…,v6) where the dihedral group
acts on the set of indices in the natural way.
In order to input the diameter distance structure
- either a comma-separated list of 6 diameter distances
describing the complete diameter distance structure of a tone row
must be input, e.g.
1,2,4,4,5,4
- or a part of the diameter distance structure of a tone row must
be input, e.g.
2,4
which is a diameter distance structure of length 2,
- or a blank-separated list of distance structures as in 2. must
be input. E.g.
1,2 4,5,4
which consists of two structures of length 2 and 3. Using
AND demands that all the different parts must
simultaneously occur in the diameter distance structure of a tone
row, whereas using OR at least one of these parts must
occur in in the diameter distance structure of a tone row.
- It is also possible to replace the occurrence of a single
(numerical) digit by a dot . or by
\d
of exactly two (numerical) digits by two dots .. or by
\d\d
of arbitrary many digits by .*? or by
\d*?
Searching for a diameter distance structure finds
- the occurrence of the input structure in the diameter distance
structure of a tone row in normal form,
- but also in its retrograde,
- or in its cyclic shifts. E.g. the sequence
4,1,2
is found in a tone row with diameter distance structure
1,2,4,4,5,4
even though the three numbers occur at the end and the beginning of
this sequence in retrograde order.)
List of all 2065 diameter
distance structures.
Database on tone rows and tropes
harald.fripertinger "at" uni-graz.at
January 2, 2019