# Introduction¶

`pyunicorn` (Unified Complex Network and RecurreNce analysis toolbox) is an object-oriented Python package for the advanced analysis and modeling of complex networks. Beyond the standard measures of complex network theory (such as degree, betweenness and clustering coefficients), it provides some uncommon but interesting statistics like Newman’s random walk betweenness. `pyunicorn` also provides novel node-weighted (node splitting invariant) network statistics, measures for analyzing networks of interacting/interdependent networks, and special tools to model spatially embedded complex networks.

Moreover, `pyunicorn` allows one to easily construct networks from uni- and multivariate time series and event data (functional/climate networks and recurrence networks). This involves linear and nonlinear measures of time series analysis for constructing functional networks from multivariate data (e.g., Pearson correlation, mutual information, event synchronization and event coincidence analysis). `pyunicorn` also features modern techniques of nonlinear analysis of time series (or pairs thereof), such as recurrence quantification analysis (RQA), recurrence network analysis and visibility graphs.

`pyunicorn` is fast, because all costly computations are performed in compiled C code. It can handle large networks through the use of sparse data structures. The package can be used interactively, from any Python script, and even for parallel computations on large cluster architectures. For information about individual releases, see our CHANGELOG and CONTRIBUTIONS.

## Example¶

To generate a recurrence network with 1000 nodes from a sinusoidal signal and to compute its network transitivity, you can simply run:

```import numpy as np
from pyunicorn.timeseries import RecurrenceNetwork

x = np.sin(np.linspace(0, 10 * np.pi, 1000))
net = RecurrenceNetwork(x, recurrence_rate=0.05)
print(net.transitivity())
```