I don't want groups of student change their room during a day! except LABS

[AZ]

hi
in my timetable I see that student groups changes their rooms during a day;
example:

MONDAY    1        2         3         4           5 period
room A      3B      3B      4A       4A          3B          not good
room B      3C      3C      4B       4B          3C         not good
LAB 1        3D      3D      3C       3C          4A         this is OK
LAB 2        3E      3E      3B        3B          4B         this is OK

must be
MONDAY    1        2         3         4           5 period
room A      3B      3B       x          x           3B         
room B      3C      3C      x          x            3C         
LAB 1        3D      3D      3C       3C          4A         
LAB 2        3E      3E      3B        3B          4B         

I cannot assign permanently  room A to class 3B and room B to 3C, because the next day the groups 3B and 3C are in another building
how can I do?
thanks

[Liviu Lalescu]

Space constraint activities occupy max 1 different rooms, for all activities of the students set other than labs.

Hmm, this does not allow them to change rooms in other days - so it is more restrictive that what you want.

[AZ]

does this mean I cannot keep a room empty when the students are in LAB?
any trick for having this?

[Volker Dirr]

maybe i missunderstood.

but why don't you simply disallow room A and B fot group 4A and 4B?

BTW: Where should 4A and 4B be at hour 3 and 4?

[AZ]

4A and 4B come from Gym

I try to make it easier:

I have two buildings
- one with labs and gym
- one without

I must swap students from one building to another, but I surely forgot some constraint because when group 1 is in LAB, FET uses 1's empty room for group 2; when group 1 returns from LAB and group 3 goes to LAB, FET uses 3's empty room to store the group 2; when group 3 returns from LAB and group 4 goes to LAB, FET uses 4's empty room to store group 2. So group 2 moves from room to room!
My boss desn't want a group spinning around in the building and wants group 2 to stay in the other building that day;
so I must tell FET that when group 1 goes to LAB, 1's room is not available for other groups (students leave in the room their books, rucksacks, garments, helmets, money...)
but I really don't know how to do it 
consider that I cannot permanently disallow those rooms for group 2, otherwise FET keeps always group 2 in the second building, where there is no LAB.
I'm blocked!

[Liviu Lalescu]

Add dummy activities, constrain them with same starting time to the lab activities. Then, same room (activities occupy max 1 room) for all real activities which are not lab and including the dummy ones.

[AZ]

if I understood the right way (not sure)

what I get:
MONDAY
building 1                                                              building 2
room A          3D   3D      3A    3A    3A     3A           room D       3E   3E      3E     3E     3E       3E
room B          3B   3B      3D     3D   3B     3B           room E        4A   4A      4A     4A     4A       4A
room C          3C  3C     3C   3C     3D     3D            room F        x     x        x       x        x         x
LAB               3A   3A      3B    3B    3C    3C

what I want:                                             
MONDAY
building 1                                                              building 2
room A           x     x      3A    3A    3A     3A            room D        3D   3D     3D     3D     3D      3D
room B          3B   3B     x      x      3B     3B            room E        3E   3E      3E     3E     3E       3E
room C          3C  3C     3C   3C     x       x              room F        4A   4A      4A     4A     4A       4A
LAB               3A   3A     3B    3B    3C    3C

what I need to solve:
3A_dummy, 3B_dummy, 3C_dummy
dummy_teacher
dummy_activity_2_hours

menu Time->Activities->A set of activity has same starting time (day + hour)
Add: activities: LAB-3A & dummy_activity_2_hours-3A_dummy
Add: activities: LAB-3B & dummy_activity_2_hours-3B_dummy
Add: activities: LAB-3C & dummy_activity_2_hours-3C_dummy

menu Space->Activities->A set of activities occupies max different rooms
Add: ALL activities of 3A except LAB; Add dummy_activity_2_hours-3A_dummy; Select Max different room = 1
Add: ALL activities of 3B except LAB; Add dummy_activity_2_hours-3B_dummy; Select Max different room = 1
Add: ALL activities of 3C except LAB; Add dummy_activity_2_hours-3C_dummy; Select Max different room = 1

that doesn't sound similar to what you told me, so I'm a little messy 

Antonio

[Liviu Lalescu]

if I understood the right way (not sure)

I think you understood correctly

that doesn't sound similar to what you told me, so I'm a little messy 

What do you mean?

[AZ]

1.
you told me

same room (...) for all real activities which are not lab and including the dummy ones.

the constraint I used instead is
Max different room = 1

and this is not  the same, just the more similar I found
(or maybe this means 1 and only 1 room for all the selected activity)

2.
I tried with one single group of students (3A), just to see the result:
FET stopped after some minutes telling me that a constraint was blocking the placement of an activity of 3A

so probably I didn't understand your trick the right way
I'll try again changing something
Thanks for all
Antonio

[Liviu Lalescu]

Max different rooms = 1, yes.

Please try practically, I hope you'll get it.

[Volker Dirr]

maybe i missunderstood, but maybe just using HOME room contraints is already enough.

[AZ]

I cannot set home rooms, since I must swap students
example
                                             
MONDAY
building 1                                                              building 2
room A           x     x      3A    3A    3A     3A            room D        3D   3D     3D     3D     3D      3D
room B          3B   3B     x      x      3B     3B            room E        3E   3E      3E     3E     3E       3E
room C          3C  3C     3C   3C     x       x              room F        4A   4A      4A     4A     4A       4A
LAB               3A   3A     3B    3B    3C    3C

TUESDAY
building 1                                                              building 2
room A           x     x      3D    3D    3D     3D            room D       3A   3A      3A     3A     3A      3A
room B          3E   3E     x      x      3E     3E            room E        3B   3B      3B     3B     3B      3B
room C          4A  4A     4A   4A      x       x              room F        3C   3C     3C     3C     3C      3C
LAB               3D   3D     3E    3E    4A    4A

but maybe I'm asking too much
Antonio

[Volker Dirr]

maybe you can use home roomS. (maybe select one room per building).