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Why I am i getting a negative value for the spread when i restricted it have positive values.?I would be glad if anyone could help.

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Honey Adams
Honey Adams 2018-7-5
评论： Honey Adams 2018-7-5
clear all
clc
IN=[-0.04844752 0.041968141 -0.044564664;
-0.304020248 0.131284505 0.472041681;
-0.074829705 -0.049999997 -0.094350919;
0.28895241 0.390694469 0.416666657;
-0.098011374 0.012270158 -0.067317739;
-0.175849974 -0.160909101 -0.174713209;
-0.141403094 -0.004999995 -0.098300003;
-0.210274339 -0.191784486 -0.109999985
]
OUT=[-0.148966655;
0.281067416;
-0.154999971;
0.360221535;
-0.120833755;
-0.18519102;
-0.136289001;
-0.184634596 ]
h=0.2
p=1-h
NEWIN=[ones(size(IN,1),1) IN]
num_NEWIN=size(NEWIN,2)
D=zeros(num_NEWIN,num_NEWIN)
E=(-1).*eye(num_NEWIN,num_NEWIN)
B=zeros(num_NEWIN,1)
A=[-NEWIN -p*abs(NEWIN); NEWIN -p*abs(NEWIN); D E]
b=[-OUT; OUT; B]
v1=sum(abs(NEWIN(:,1)))
v2=sum(abs(NEWIN(:,2)))
v3=sum(abs(NEWIN(:,3)))
v4=sum(abs(NEWIN(:,4)))
f=[zeros(num_NEWIN,1);v1;v2;v3;v4]
%f=[zeros(num_NEWIN,1);ones(num_NEWIN,1)]
x=linprog(f,A,b)
Center_coeff= x(1:4,1)
spread_coeff= x(5:8,1)

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采纳的回答

Constantino Carlos Reyes-Aldasoro
Just ran your code and had this:
spread_coeff =
0.0452
0
0
0
No negatives

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