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Need a Smile Empty Need a Smile

Post by Pokermind on Fri Oct 30, 2015 11:03 pm

Need a Smile 11866390_433952640138954_1437699124437182345_n

Can you think of others?
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Need a Smile Empty Re: Need a Smile

Post by Admin on Wed Feb 03, 2016 12:55 pm


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Post by Pokermind on Wed Feb 03, 2016 1:26 pm

Good one Admin, why not post pic:

Need a Smile Navy-trolling_o_1202841
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Post by Admin on Sat Feb 06, 2016 11:07 am

Because I was at work in front of students with two screens and the projector on and a failed copy/paste isn't a good idea Smile

On the other screen it was written (and yes it makes sense to me, but not a lot to students!)




MODEL:
!Given a set of nodes and the distance between each pair, find
the shortest total distance of links on the network to connect
all the nodes. This is the classic minimal spanning tree (MST)
problem. Typical application is designing the network of
utilities in a community, e.g., sewers, power lines,
phone lines, cable TV, roads, water lines, also electric
circuit design;
SETS:
CITY: LVL;
! LVL( I) = level of city I in tree. LVL( 1) = 0;
LINK( CITY, CITY):
DIST, ! The distance matrix;
X; ! X( I,J) = 1 if we use link I, J;
IFLINK(CITY,CITY,CITY,CITY); ! Link 1,2 only if link 3,4;
ATMOST1(CITY,CITY); ! At most one of these links;
ENDSETS
! This model finds the minimum cost network connecting
a set of cities;
DATA:
CITY = A B C D E;
! Distance matrix need not be symmetric. City 1 is base;
DIST = 0 20 10 15 99 !from A;
20 0 99 99 30 !from B;
10 99 0 25 5 !from C;
15 99 25 0 40 !from D;
99 30 5 40 0;!from E;

IFLINK = A, D, D, E;
ATMOST1 = A,D C,D, A,B;
ENDDATA
!----------------------------------------------;
! Take care of special constraints;
! Link i,j only if link r,s;
@FOR( IFLINK(I,J,R,S):
X(I,J)+X(J,I) <= X(R,S)+X(S,R);
);
! At most 1 of the links in this set;
@SUM(ATMOST1(I,J): X(I,J)+X(J,I)) <= 1;
! This is a simple, small, loose formulation.
Warning, may be slow for N > 8;
N = @SIZE( CITY);
!The objective is to minimize total dist. of links;
MIN = @SUM( LINK(I,J): DIST(I,J) * X(I,J));
!For city K, except the base, ... ;
@FOR( CITY( K)| K #GT# 1: ! It must be entered;
@SUM( CITY( I)| I #NE# K: X( I, K)) = 1;
!If there is a link from J-K, then LVL(K)=LVL(J)+1.
Note:These are not very powerful for large problems;
@FOR( CITY( J)| J #NE# K:
LVL( K) >= LVL( J) + X( J, K)
- ( N - 2) * ( 1 - X( J, K))
+ ( N - 3) * X( K, J); ); );
LVL( 1) = 0; ! City 1 has level 0;
!There must be an arc out of city 1;
@SUM( CITY( J)| J #GT# 1: X( 1, J)) >= 1;
!Make the X's 0/1;
@FOR( LINK: @BIN( X); );
!The level of a city except the base is at least 1 but no more than N-1,
and is 1 if link to the base;
@FOR( CITY( K)| K #GT# 1:
@BND( 1, LVL( K), 999999);
LVL( K) <= N - 1 - ( N - 2) * X( 1, K); );
END


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Post by Pokermind on Fri Feb 12, 2016 5:22 pm

Need a Smile 12687903_654810217991473_5084420284481981826_n

Enlisted mother's view of officers comes through, explaining why they don't allow fraternization.
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Post by Pokermind on Fri Feb 12, 2016 5:39 pm

Watch out Taylor!

Need a Smile 11825890_1199798066712634_8476546610923064070_n

Photo from Taylor's Facebook page.
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Post by Pokermind on Sat Feb 13, 2016 1:19 pm

Need a Smile 12745519_1091090327579008_6632861693207579334_n

Kitten Warrior ready to do battle with the red dot.
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Post by Pokermind on Sun Feb 14, 2016 10:17 pm

Idaho humor, we had the back of Stinker Station signs, this one in a field of rounded basalt rocks (now mostly gone) brought a smile before the interstate on old US 30:

Need a Smile 12717500_809916642473683_4701382447844735205_n
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