Compute MNI talairach coordinates from RAS coords.

Usage

ras.to.talairachras(ras_coords, talairach, invert_transform = FALSE)

ras_coords: nx3 numerical vector, the input surface RAS coordinates. Could be the vertex coordinates of an 'fs.surface' instance, or the RAS coords from a surface label.
talairach: the 4x4 numerical talairach matrix, or a character string which will be interpreted as the path to an xfm file containing the matrix (typically $SUBJECTS_DIR/$subject/mri/transforms/talairach.xfm).
invert_transform: logical, whether to invert the transform. Do not use this, call link{talairachras.to.ras} instead.

the Talairach RAS coordinates for the given RAS coordinates

You can use this to compute the Talairach coordinate of a voxel, based on its RAS coordinate.