RapidPT is an open-source MATLAB toolbox for fast and efficient permutation testing. RapidPT is available as a stand-alone toolbox and can be downloaded here (nitrc) or from its Github page: https://github.com/felipegb94/RapidPT. For ease of use, RapidPT has also been integrated into the development version of SnPM. For a description of RapidPT and the usage within SnPM please refer to the documentation page: http://felipegb94.github.io/RapidPT/

RapidPT is able to achieve substantial speedups over state of the art permutation testing implementations (e.g. SnPM) without compromising accuracy. For a thorough analysis of the scenarios were RapidPT performs best please refer to the paper:

Accelerating Permutation Testing in Neuroimaging through Subspace Tracking: A new plugin for SnPM.
F. Gutierrez-Barragan, V.K. Ithapu, C. Hinrichs, C. Maumet, S.C. Johnson, T.E. Nichols, V. Singh.
Neuroimage, 2017. https://doi.org/10.1016/j.neuroimage.201...