mne.add_source_space_distances(src, dist_limit=inf, n_jobs=1, verbose=None)[source]

Compute inter-source distances along the cortical surface.

This function will also try to add patch info for the source space. It will only occur if the dist_limit is sufficiently high that all points on the surface are within dist_limit of a point in the source space.

Parameters
srcinstance of SourceSpaces

The source spaces to compute distances for.

dist_limitfloat

The upper limit of distances to include (in meters). Note: if limit < np.inf, scipy > 0.13 (bleeding edge as of 10/2013) must be installed. If 0, then only patch (nearest vertex) information is added.

n_jobsint

The number of jobs to run in parallel (default 1). Requires the joblib package. Ignored if dist_limit==0..

verbose

If not None, override default verbose level (see mne.verbose() and Logging documentation for more).

Returns
srcinstance of SourceSpaces

The original source spaces, with distance information added. The distances are stored in src[n][‘dist’]. Note: this function operates in-place.

Notes

This function can be memory- and CPU-intensive. On a high-end machine (2012) running 6 jobs in parallel, an ico-5 (10242 per hemi) source space takes about 10 minutes to compute all distances (dist_limit = np.inf). With dist_limit = 0.007, computing distances takes about 1 minute.

We recommend computing distances once per source space and then saving the source space to disk, as the computed distances will automatically be stored along with the source space data for future use.