Sequence Editor
LiSA allows you to manipulate any computed sequence manually by
shifting operations in a job order or machine order, respectively.
How to invoke the Sequence Editor:
Choose an operation by double clicking on its entry in the latin
square in the schedule window (not in the
main window) or on the corresponding rectangle in the gantt chart. In
the gantt chart this operation will be marked by a black border.
How to Shift an Operation:
To shift the choosen operation (i,j), use the following buttons in the
sequence manipulation window
- Source
-
Operation (i,j) becomes a source in the sequence granph, i.e., no
other operation is predecessor of (i,j).
- Sink
-
Operation (i,j) becomes a sink in the sequence granph, i.e., no
other operation is successor of (i,j).
-
Operation (i,j) is scheduled first in the machine order of job i,
i.e. job i starts on machine j.
-
-
Operation (i,j) is scheduled one position earlier in the machine
order of job i.
-
Operation (i,j) is scheduled last in the machine order of job i,
i.e. job i is completed on machine j.
-
Operation (i,j) is scheduled one position later in the machine
order of job i.
- Vertical Arrows:
-
Same as the corresponding horizontical ones, but affect the job
order of machine j instead of the machine order of job i.
-
Restore the sequence as it was before invoking the sequence editor.
If this does not work
- In a job shop or flow shop problem the machine orders of all jobs
are prescribed. Thus, the correspondig buttons cannot be choosen.
- Shifting an operation can create a cycle in the sequence
graph. In this case an error message is printed and the shift is
not carried out.
Table of Contents
15.02.2000 TAU