Picked atoms constitute the HISTORY list. An atom is PICKED, when the cursor is placed on its IMAGE location and a mouse button is pressed. The history information of the picked atom appears in white at the atom position.
HISTORY list is input for any other Strikes MENU function. In general atoms are first picked in desired order and then some other function is activated. This way mistakes by picking atoms can be corrected easily and the same picked atoms can be reused.
Through the HISTORY lists of interatomic distances, angles, dihedral angles or ramachandran plot position of a amino acid can be monitored while changing atom(s) positions.
> IMAGE HISTORY INITIALIZE
HIS_ERAS empties the history array (set the counter of atoms present to zero and deletes all history images).
> IMAGE HISTORY DROP
Drops the last PICKED atom from the HISTORY list.
Keyboard equivalent key is 'd'.
> IMAGE HISTORY NAME ON
OFF
HIS_NAME removes the HISTORY atom information from the image without actually modifying the history list. Toggling the atomic history list is usefull when it gets large.
> IMAGE HISTORY DISTANCE
Displays DISTANCE between last two PICKED atoms and connects them with the white history line.
> IMAGE HISTORY ANGLE
Displays the ANGLE among the last 3 PICKED atoms and connects them with the white history line.
> IMAGE HISTORY DIHEDRAL
Displays the DIHEDRAL angle among the last 4 PICKED atoms and connects them with the white history line.
> IMAGE HISTORY INTERNAL
Displays DISTANCE, ANGLE and DIHEDRAL information of last 4 PICKED atoms.
> IMAGE HISTORY NEIGHBOUR his_neigh
Finds the NEIGHBOURS of the last PICKED atom. The neighbours are atoms closer than the specified distance, at least 3 covalent bonds away from the last picked atom and are included in the key 'image'. The distance criterion is stored in the variable named 'his_neigh'. The default value is 3.6A and can be SET with a
MAIN> SET VARIABLE his_neigh real
command sentence. Its value can be displayed with
MAIN> SHOW VARIABLES his_neigh
> IMAGE HISTORY RAMACHANDRAN
HIS_RAMA draws a cross into Ramachandran plot when it is displayed as part of the GRAPH object number 1. It is enough to PICK any atom of the desired residue and then hit HIS_RAMA. The program finds required atoms atomatically (-C N CA C +N).