請問一個LINGO求解混合整數(shù)規(guī)劃問題?
我這建了一個數(shù)學(xué)模型,從8個供應(yīng)商選擇幾個進行訂貨,X為訂貨量,Y為0-1變量,選擇時為1不選時為0.用LINGO編程,運行時顯示錯誤為：unexpected jacobian overflow.我的程序如下,我是初學(xué)者,
model1:
SETS:
m/p1,p2,p3,p4,p5,p6,p7,p8/:y,x,w,v,q,t;
ENDSETS
DATA:
w=0.233,0.544,0.329,0.780,0.533,0.454,0.762,0.303;
v=4000,2500,3500,1800,2500,2600,1800,2500;
q=0.022,0.015,0.024,0.032,0.02,0.018,0.03,0.02;
t=0.04,0.015,0.025,0,0.015,0.02,0.01,0.02;
D=5000;
Q=0.025;
t=0.025;
n=4;
ENDDATA
The objective;
max=@sum(m(j):v(j)*x(j))；
The capacity constraints;
@for(m(j):x(j)≤v(j)*y(j));
The demand constraints;
@sum(m(j):x(j))≥D;
The quality constraints;
@sum(m(j):x(j)*q(j))≤Q*D;
The time constraints;
@sum(m(j):x(j)*t(j))≤T*D;
The number of suppliers constraints;
@sum(m(j):y(j))≤4;
@for(m(j):@bin(y(j)));
@for(m(j):@gin(x(j)));
end