Question

hello, anybody familiar with lingo or lindo software?

Answer 1

LINGO is a comprehensive tool designed to help you build and solve linear, optimization models quickly, easily, and efficiently. and it is created by lindo. I guess.

Answer 2

Yes that it is, could you help me? I have model but the result always infeasible

Answer 3

I am studying about fleet assignment

Answer 4

Sets
F = Set of flights
K = Set of fleet types
C = Set of last-nodes, representing all nodes with aircraft grounded overnight at an airport in the network
M = Number of nodes in the network

Index
i = Flight Index
j = Index for fleet
k = Index for nodes

Parameters
C (i,j) = Cost of assigning fleet type j to flight i
N (j) = Number of available aircraft in fleet type j
S (i,k) = +1 if flight i is an arrival at node k, -1 if flight i is a departure from node k

Decision Variables
X (i,j) = 1 if flight is assigned to fleet-type j, 0 otherwise
G (k,j) = integer decision variable representing number of aircraft of fleet-type on ground at node k

The integer linear programming model is as
Min
∑j∈K∑i∈Fc(i,j)∗x(i,j)

subject to:
∑j∈Kx(i,j)=1∀i∈F

G(k−1,j)+∑i∈FS(i,k)∗x(i,j)=G(k,j)∀k∈Mand∀j∈K

∑k∈CG(k,j)≤N(j)∀j∈K

x(i,j)∈{0,1}∀i∈Fand∀j∈K

G(k,j)∈Z+∀k∈M∀j∈K

Answer 5

how to write in Lingo constraints number 2 and 3?