|CRP Toolbox Reference|
PurposeComputes and plots the diagonalwise CRQA measures.
Recurrence quantification analysis of diagonals in the cross recurrence plot of the vectors x and y as well as x and -y for the diagonals within the range [-w,w] around the main diagonal. The output is a structure (see below).
The input vectors can be multi-column vectors, where each column will be used as a component of the phase-space vector. However, if the first column is monotonically increasing, it will be used as an time scale for plotting.
Dimension m, delay t, the size of neighbourhood e and the range size w are the first five numbers after the data series; if w= then the whole plot will be calculated. Variable lmin sets the minimal length of what should be considered to be a diagonal line. Further parameters can be used to switch between various methods of finding the neighbours of the phasespace trajectory, to suppress the normalization of the data and to suppress the GUI (useful in order to use this programme by other programmes).
Parameters not needed to specify.
For higher speed in output the whole matrix of the recurrence plot is in the work space - this limits the application of long data series. However, a solution for using long data series you can find under the description for crp, or by using the command crqad_big.
A GUI for this task is under development.
Marwan, N., Kurths, J.: Nonlinear analysis of bivariate data with cross recurrence plots, Phys. Lett. A, 302, 2002.