ORNSTEIN_UHLENBECK is a FORTRAN77 library which approximates solutions of the Ornstein-Uhlenbeck stochastic differential equation (SDE) using the Euler method and the Euler-Maruyama method, and creating graphics files for processing by gnuplot.
The Ornstein-Uhlenbeck stochastic differential equation has the form:
dx(t) = theta * ( mu - x(t) ) dt + sigma dW, x(0) = x0.where
The starting value x0 represents a deviation from the mean value mu. The decay rate theta determines how fast x(t) will move back towards its mean value. The coefficient sigma determines the relative magnitude of stochastic perturbations.
In general, the solution starts at x0 and over time moves towards the value mu, but experiences random "wobbles" whose size is determined by sigma. Increasing theta makes the solution move towards the mean faster.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
ORNSTEIN_UHLENBECK is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.
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OU_EULER is data created by the OU_EULER routine:
OU_EULER_MARUYAMA is data created by the OU_EULER_MARUYAMA routine:
You can go up one level to the FORTRAN77 source codes.