JMSL Tutorial: MusicShape

One of the great joys of hacking JMSL is developing algorithms that generate interesting MusicShapes. So let's spend a little time doing just that.

We will build a MusicShape which displays an increasing random variation from a central value. So the algorithm to generate element[i] will depend partially on the index i itself (ie the value is a function of the index).

The key to this algorithm is the ChoosePlusMinus(int arg) method in the JMSLRandom class. This method chooses a random int between +arg and -arg (there is also a version for double). A fragment illustrates:
for (int i=0; i < numberOfElements; i++){
    double value = centralValue + JMSLRandom.choosePlusMinus(i);

You see that for example, the 50th value generated will be the result of adding centralValue to a random number between -50 and 50.

You need a Java-enabled browser to view this applet.
View the source of this applet here.

Previous Tutorial Index Tutorial Contents Next
  (C) 1997 Phil Burk and Nick Didkovsky, All Rights Reserved
  JMSL is based upon HMSL (C) Phil Burk, Larry Polansky and David Rosenboom.