Viewpoints » History » Version 2

Marcus Pearce, 2013-07-09 05:13 PM

1 1 Marcus Pearce
h1. Viewpoints
2 2 Marcus Pearce
3 2 Marcus Pearce
Viewpoints are representations of musical structure. The <code>viewpoint-sequence</code> returns a representation of a melody (composition 0 in dataset 0) corresponding to the supplied viewpoint (chromatic pitch: cpitch). The output corresponds to the pitch of each note in the melody.
4 2 Marcus Pearce
5 2 Marcus Pearce
<pre>
6 2 Marcus Pearce
CL-USER> (viewpoints:viewpoint-sequence
7 2 Marcus Pearce
	  (viewpoints:get-viewpoint :cpitch)
8 2 Marcus Pearce
	  (music-data:get-event-sequence 0 0))
9 2 Marcus Pearce
(6500 6200 6000 6000 6000 6000 6500 6500 6500 6900 6900 6900 6900 6900 6700
10 2 Marcus Pearce
 6500 6500 6500 6200 6000 6000 6500 6900 6900 6700 6500 6000 6000 6000 6000
11 2 Marcus Pearce
 6500 6500 6500 6500 6900 6900 6900 6900 7200 7200 7700 7400 7200 6900 6900
12 2 Marcus Pearce
 6900 6900 6500 6700 6900 6500 6500 6500 7700 7400 7200 7400 7600 7700 7200
13 2 Marcus Pearce
 7200 7400 7200 7400 7600 7700 7400 7200 7400 7600 7700 7600 7700 7400 7200
14 2 Marcus Pearce
 6900 6700 6500 6700 7700 7700 7400 7200 7400 7600 7700 7200 7200 7400 7200
15 2 Marcus Pearce
 7400 7600 7700 7600 7400 7200 6900 6900 6900 6900 6700 6500 6700 6900 6500
16 2 Marcus Pearce
 6500)
17 2 Marcus Pearce
</pre>
18 2 Marcus Pearce
19 2 Marcus Pearce
h2. Derived viewpoints
20 2 Marcus Pearce
21 2 Marcus Pearce
We can also use viewpoints which represent derived features such as pitch interval (cpint) or IOI ratio (ioi-ratio). Note that because these two derived viewpoints represent relationships between notes, they are undefined for the first note in the sequence (which has no predecessor).
22 2 Marcus Pearce
23 2 Marcus Pearce
<pre>
24 2 Marcus Pearce
CL-USER> (viewpoints:viewpoint-sequence
25 2 Marcus Pearce
	  (viewpoints:get-viewpoint :cpint)
26 2 Marcus Pearce
	  (music-data:get-event-sequence 0 0))
27 2 Marcus Pearce
(-300 -200 0 0 0 500 0 0 400 0 0 0 0 -200 -200 0 0 -300 -200 0 500 400 0 -200
28 2 Marcus Pearce
 -200 -500 0 0 0 500 0 0 0 400 0 0 0 300 0 500 -300 -200 -300 0 0 0 -400 200
29 2 Marcus Pearce
 200 -400 0 0 1200 -300 -200 200 200 100 -500 0 200 -200 200 200 100 -300 -200
30 2 Marcus Pearce
 200 200 100 -100 100 -300 -200 -300 -200 -200 200 1000 0 -300 -200 200 200 100
31 2 Marcus Pearce
 -500 0 200 -200 200 200 100 -100 -200 -200 -300 0 0 0 -200 -200 200 200 -400 0)
32 2 Marcus Pearce
</pre>
33 2 Marcus Pearce
34 2 Marcus Pearce
35 2 Marcus Pearce
<pre>
36 2 Marcus Pearce
CL-USER> (viewpoints:viewpoint-sequence
37 2 Marcus Pearce
	  (viewpoints:get-viewpoint :ioi-ratio)
38 2 Marcus Pearce
	  (music-data:get-event-sequence 0 0))
39 2 Marcus Pearce
(1 1/2 1 1 1 2 1/2 1 1 1 1 1 2 1 1/2 1 2 1 1/2 1 2 1/2 1 3 1/3 1 1 1 1 1 1 1 1
40 2 Marcus Pearce
 1 1 1 1 1 1 1 1 1 1 1 1 2 1/2 1 1 1 2 3/2 1/3 1 1 1 1 2 1/2 1 1 1 1 1 4 1/4 1
41 2 Marcus Pearce
 1 1 1 1 1 1 1 1 1 1 2 1/2 1 1 1 1 1 2 1/2 1 1 1 1 1 2 1/2 1 1 1 1 1 1 1 1 1 2
42 2 Marcus Pearce
 1)
43 2 Marcus Pearce
</pre>
44 2 Marcus Pearce
45 2 Marcus Pearce
46 2 Marcus Pearce
h3. Linked viewpoints
47 2 Marcus Pearce
48 2 Marcus Pearce
Linked viewpoints are represented as a list of component viewpoints. Here is an example of linking pitch interval (cpint) with scale degree (cpintfref):
49 2 Marcus Pearce
50 2 Marcus Pearce
<pre>
51 2 Marcus Pearce
CL-USER> (viewpoints:viewpoint-sequence
52 2 Marcus Pearce
	  (viewpoints:get-viewpoint '(:cpint :cpintfref))
53 2 Marcus Pearce
	  (music-data:get-event-sequence 0 0))
54 2 Marcus Pearce
((-300 900) (-200 700) (0 700) (0 700) (0 700) (500 0) (0 0) (0 0) (400 400)
55 2 Marcus Pearce
 (0 400) (0 400) (0 400) (0 400) (-200 200) (-200 0) (0 0) (0 0) (-300 900)
56 2 Marcus Pearce
 (-200 700) (0 700) (500 0) (400 400) (0 400) (-200 200) (-200 0) (-500 700)
57 2 Marcus Pearce
 (0 700) (0 700) (0 700) (500 0) (0 0) (0 0) (0 0) (400 400) (0 400) (0 400)
58 2 Marcus Pearce
 (0 400) (300 700) (0 700) (500 0) (-300 900) (-200 700) (-300 400) (0 400)
59 2 Marcus Pearce
 (0 400) (0 400) (-400 0) (200 200) (200 400) (-400 0) (0 0) (0 0) (1200 0)
60 2 Marcus Pearce
 (-300 900) (-200 700) (200 900) (200 1100) (100 0) (-500 700) (0 700)
61 2 Marcus Pearce
 (200 900) (-200 700) (200 900) (200 1100) (100 0) (-300 900) (-200 700)
62 2 Marcus Pearce
 (200 900) (200 1100) (100 0) (-100 1100) (100 0) (-300 900) (-200 700)
63 2 Marcus Pearce
 (-300 400) (-200 200) (-200 0) (200 200) (1000 0) (0 0) (-300 900) (-200 700)
64 2 Marcus Pearce
 (200 900) (200 1100) (100 0) (-500 700) (0 700) (200 900) (-200 700) (200 900)
65 2 Marcus Pearce
 (200 1100) (100 0) (-100 1100) (-200 900) (-200 700) (-300 400) (0 400)
66 2 Marcus Pearce
 (0 400) (0 400) (-200 200) (-200 0) (200 200) (200 400) (-400 0) (0 0))
67 2 Marcus Pearce
</pre>