| GRADMAP | Compute the gradient of an EEG spatial distribution. |
| Usage: | >> [gradX, gradY ] = gradmap( map, filename, draw ) |
| Inputs: | |
map |
level of activity (size: nbelectrodes x nbChannel) |
filename |
filename (.loc file) countaining the coordinates of the electrodes, or array countaining complex positions Can also be a EEGLAB channel structure. |
draw |
integer, if not nul draw the gradient (default:0) |
| Output: | |
gradX |
gradient over X |
gradY |
gradient over Y (use cart2pol to get polar coordinates) |
| Author: | Arnaud Delorme, CNL / Salk Institute, 2001 |