GEN44 — Generates a stiffness (connection) matrix for use in scanu/scanu2.
The file named in version 1 or the file stiff.num in the second case is read to create the matrix.
The first line of the file should be “ <MATRIX size=integer> ” and it creates a square matrix of the indicated size. This is followed by lines of two or three numbers, the first two denoting a connection from the first to the second and the third is a weight. If the third is omitted it is taken as value 1. The list is terminated by a “ </MATRIX> ” line or end of file.
Example of this matrix format:
<MATRIX size=16>
1 2 2
2 3 1
3 4 3
4 5 1
5 6 4
6 7 1
7 8 5
8 9 6
9 10 7
10 11 6
11 12 5
12 13 4
13 14 3
14 15 2
15 16 1
16 1 9
14 13 2
10 3 6
6 4 2
2 14 7
</MATRIX>
can be given as zero in which case a size*size table is created. If the size in the gen statememt is too small for the matrix then space is re-allocated to the required size.
Note: to avoid confusion with other matrix formats, it is best to save this matrix format file using the extension file.matrxT.
Here is an example of the GEN44 generator. Play gen44.csd
Example 1311. Example of the GEN44 generator.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 1 0dbfs = 1 instr scan a0 init 0 irate = .01 kmass line 2,p3,5 kstiff line 30,p3,45 kcenter line .08,p3,.01 kdamp line .01,p3,.08 kpos line 0,p3,16 kdisplace line 0,p3,.5 ;scanu2 init,irate,ifndisplace,ifnmass,ifnmatrix,ifncentr,ifndamp,kmass,kmtrxstiff, ; kcentr, kdamp, ileft, iright, kpos, kdisplace, ain, idisp, id scanu2 -1, irate, 6, 2, 3, 4, 5, kmass, kstiff, kcenter, kdamp, .2, .7, kpos, kdisplace, a0, 1, 2 ;ar scans kamp, kfreq, ifntraj, id a1 scans ampdbfs(p4), cpspch(p5), 7, 2 a1 dcblock2 a1 out a1 endin </CsInstruments> <CsScore> ; Initial displacement condition f1 0 16 10 1 ; sine hammer ; Masses f2 0 16 -7 1 16 1 ; Spring matrices f3 0 0 -44 "string_with_extras-16.matrxT" ; Centering force f4 0 16 -7 1 16 1 ; uniform initial centering ; Damping f5 0 16 -7 1 16 1 ; uniform damping ; Initial displacement - (displacement, vel, and acceleration ; Acceleration is from stiffness matrix pos effect - increases acceleration f6 0 16 -7 .01 16 .01 ; uniform initial velocity-displacement ; Trajectories f7 0 16 -5 .001 16 16 i"scan" 0 2 -6 7.00 i"scan" 2 2 -6 5.00 i"scan" 4 2 -6 6.00 i"scan" 6 2 -6 8.00 i"scan" 8 2 -6 10.00 e </CsScore> </CsoundSynthesizer>