[FieldTrip] Pruning

[Richards, John]

In on of the source analysis modules, likely for the simbio lead field computation, I get the message below about pruning elements of the head model.  Does anyone know what this means?  I don't think I have seen it before.

John

creating sourcemodel based on user specified 3D grid
using electrodes specified in the configuration
selecting dipole positions inside the 'gm' tissue
pruning headmodel volume elements from 1572480 to 450494 (29%)
pruning headmodel vertices from 262013 to 159509 (61%)
pruning dipole positions from 1887681 to 1759824 (93%)

This is in the ft_inside_headmodel, both inverse and forward

./inverse/private/ft_inside_headmodel.m:    fprintf('pruning headmodel volume elements from %d to %d (%d%%)\n', numhex, sum(insidehex), round(100*sum(insidehex)/numhex));
./inverse/private/ft_inside_headmodel.m:    fprintf('pruning headmodel vertices from %d to %d (%d%%)\n', numpos, sum(insidepos), round(100*sum(insidepos)/numpos));
./inverse/private/ft_inside_headmodel.m:    fprintf('pruning dipole positions from %d to %d (%d%%)\n', numdip, sum(insidedip), round(100*sum(insidedip)/numdip));

./forward/ft_inside_headmodel.m:    fprintf('pruning headmodel volume elements from %d to %d (%d%%)\n', numhex, sum(insidehex), round(100*sum(insidehex)/numhex));
./forward/ft_inside_headmodel.m:    fprintf('pruning headmodel vertices from %d to %d (%d%%)\n', numpos, sum(insidepos), round(100*sum(insidepos)/numpos));
./forward/ft_inside_headmodel.m:    fprintf('pruning dipole positions from %d to %d (%d%%)\n', numdip, sum(insidedip), round(100*sum(insidedip)/numdip));
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John E. Richards
Carolina Distinguished Professor
Department of Psychology
University of South Carolina
Columbia, SC  29208
Dept Phone: 803 777 2079
Fax: 803 777 9558
Email: richards-john at sc.edu<mailto:richards-john at sc.edu>
https://urldefense.com/v3/__https://jerlab.sc.edu__;!!HJOPV4FYYWzcc1jazlU!-J1ZRygBFwHfm02-qbAb5IRd5vZq6CUPGnlnoLEy8Y7Ar0w4fUhpC1FPgOompIoyFW2guQl_5gKtR0mQnk8D-BQRrlgo$ 
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