conditions writing in matlab

I don't know what is the problem about the codes which is used to deal with the follwing model.

I hope to get your help ,it is greatly appreciated ！

The codes is :

for j = 1:50
    for o = 1:50
        if j ~= o
            F = [F abs(x(:,j)-x(:,o))>0];
        end
    end
end

The model is :

r(j):@sum(k(i):@abs(x(i,j)-x(i,j)))>0;   (It's in lingo)

[Walter Roberson]

Are you sure that is the model? it has x(i,j)-x(i,j) which is 0 for all finite x

[超 李]

This condition denotes a divergence condition; it requires that the offered products must pairwise differ in at least one attribute level. The whole codes in “ https://www.mathworks.com/matlabcentral/answers/559355-yalmip-using-in-matlab”

[SL: Formatted message as text not code.]

[Walter Roberson]

When I look at

abs(x(i,j)-x(i,j))

I see that the first term of the subtraction is x(i,j) and the second term of the subtraction is also x(i,j) and I would say that subtracting any finite value from itself would give 0.

In order to express that attrubutes must differ, you would need to be subtracting something different.

[超 李]

You are right . In the second x(i,j), 'j' have been replaced with 'o' in my codes,and they have same range ,so I restrict that 'if j ~= o F = [F abs(x(:,j)-x(:,o))>0];'.Thus it is ok in theory .

thank you a lot .

[Walter Roberson]

can you just test x(:,j)~=x(:,o)

[超 李]

I have tested, it is a error.

Constraint converted to logical can not be agreed.

error in YALMIP_3 (line 114)

if x(:,j)~=x(:,o)

my new codes are :

for j = 1:50

for o = 1:50

if x(:,j)~=x(:,o)

F = [F abs(x(:,j)-x(:,o))>0];

end

end

end

It is very important for me .Thank you anyway.

I am a chinese, my 'wechat' numbers are 18734658148 , and my 'qq' numbers are 2328246279.

I'd like to have your contact information.

we can be good friends.

[Johan Löfberg]

In case you haven't already, you should post this on the YALMIP Google groups instead for support.

The problem is that you are using a strict inequality, which isn't supported (as all the warnings are telling you, very loudly)

Answer 1

[madhan ravi]

 x(j, :)

[超 李]

I have tested it, but it does’t work. The error is “ In > (line 12) In YALMIP_3 (line 115) 警告: Strict inequalities are not supported. A non-strict has been added instead')”. The whole codes in “ https://ww2.mathworks.cn/matlabcentral/answers/559355-yalmip-using-in-matlab”