Compute MNI talairach coordinates from RAS coords.

`talairachras.to.ras(tal_ras_coords, talairach)`

## Arguments

tal_ras_coords |
coordinate matrix in Talairach RAS space |

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`). |

## Value

the Talairach RAS coordinates for the given RAS coordinates. They are based on a linear transform.

## Note

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

## References

see https://en.wikipedia.org/wiki/Talairach_coordinates