pwDisturb


 pwDisturb(strength)

 Disturbes the currently fitted parameters either using

  parNew = parOld * 10^(strength * eps)

 with eps being normally distributed ~ N(0, 1)

 or quasi random numbers.

Arguments for pwDisturb

 strength  If unspecified: config.optimization.strengthOfDisturbance

Quasi random numbers

 In the case of

  config.optimization.useQRNG = true

 a call of pwDisturb will increase

  config.optimization.indexQRNG

 by 1 and calculate new parameter values based on a quasi
 random number generator which will asympotically spread
 parameter settings uniformly throughout the whole parameter
 space for up to 40 parameters.

 In order to start a new QRNG sequence just set

  config.optimization.indexQRNG = 1;

 In the case of a fit sequence, the QRNG index is automatically
 reset for each fit sequence in case of

  config.optimization.autoResetQRNG = true,

 which is the default setting.

 A variation of the QRNG approach is a uniform distribution
 in logarithmic parameter space, i.e. on the magnitudes of the
 parameters. For this, please use

 config.optimization.useLogQRNG = true;

 The used algorithm to calculate the quasi random numbers is
 based on the SOBOL implementation of the GNU Scientific Library.
 The corresponding source code is open source and can be obtained
 under the terms of the GNU General Public License from the
 PottersWheel developer team.

Note

 In contrast to the disturb button in the equalizer GUI,
 the system is not re-integrated by calling only pwDisturb.
 The same behaviour can be achieved by calling

  pwDisturb;
  pwLocalIntegrateFun;
  pwPlot;

pwDisturb

Arguments for pwDisturb

Quasi random numbers

Note

See also