“Error using logical Conversion to logical from constraint is not possible."

[Ding YiFan]

when I use the following syntax in the model,  I get the following error:

“Error using logical

Conversion to logical from constraint is not possible."

Error in DataOfUsers (line 150)

    if IfTransfer(i)==-2

 I define that "IfTransfer=binvar(10,1); "

for i=1:10                                                  

    if IfTransfer(i)==-2

            for j=1:22

                DataOfLoad1(i,j)=DataOfLoad0(i,j+2);

            end

            DataOfLoad1(i,23)=DataOfLoad0(i,1);

            DataOfLoad1(i,24)=DataOfLoad0(i,2);

            DataOfLoad0(i,:)=0;

    elseif IfTransfer(i)==-1

            for j=1:23

                DataOfLoad1(i,j)=DataOfLoad0(i,j+1);

            end

            DataOfLoad1(i,24)=DataOfLoad0(i,1);

            DataOfLoad0(i,:)=0;

    elseif IfTransfer(i)==0

            for j=1:23

                DataOfLoad1(i,j)=DataOfLoad0(i,j);

            end

            DataOfLoad0(i,:)=0;

    elseif IfTransfer(i)==1

            for j=2:24

                DataOfLoad1(i,j)=DataOfLoad0(i,j-1);

            end

            DataOfLoad1(i,1)=DataOfLoad0(i,24);

            DataOfLoad0(i,:)=0;

    elseif IfTransfer(i)==2

            for j=3:24

                DataOfLoad1(i,j)=DataOfLoad0(i,j-2);

            end

            DataOfLoad1(i,1)=DataOfLoad0(i,23);

            DataOfLoad1(i,2)=DataOfLoad0(i,24);

            DataOfLoad0(i,:)=0;

    end

end

so what can I do?

[Johan Löfberg]

http://users.isy.liu.se/johanl/yalmip/pmwiki.php?n=Commands.implies

[Ding YiFan]

Sorry, I still do not know how to  solve this problem. And I can  not understand the function of ‘implies’. If I can not use 'if', how can I compare sdpvar with matrix?

[Johan Löfberg]

To code the logical condition 

if x % x is a binary variable

 z == 1

end

You add the constraint implies(x, z==1);

Simarily more general

if x >= 23

 z == 1

end

You add the constraint implies(x>=23, z==1);

[Ding YiFan]

Oh, thank you! I have understood ‘implies'. However, how should I rewrite the following cede?

 for j=1:22

               DataOfLoad1(i,j)=DataOfLoad0(i,j+2);

           end

           DataOfLoad1(i,23)=DataOfLoad0(i,1);

           DataOfLoad1(i,24)=DataOfLoad0(i,2);

           DataOfLoad0(i,:)=0;

 I do not think I can add it as a parameter of 'implies( , )'.

[Johan Löfberg]

parameter?

why don't you simply write x(1) == x(3:2:23), x(2) == x(2:2:24)