Here in my code I defined A vector and B vector for my linear programing, the relationship between them is Ax=<B which A is a inequlity vector and B is a RHS and x is variable. the Error is in photo which i attached .how can I solve it?

this is the way I defined b_ineaualty_sec5 :

    [b_ineq_sec5]=load_kw* ones(N_time_slots,1);

and this is the way I defined A_inequality_sec5 :

    temp2=eye(N_time_slots);
[A_ineq_sec5]=generate_Cplx_Constraint_format( Vars_size, [3;9],-temp2,temp2);

the relationship between A and b is Ax=<b which A is a inequlity vector and B is a RHS and x is variable. I know the problem is with the size of b and A , but how should I define b ?

and this is vars_size and generate_cplex_format functions:

    function [Vars_size]= create_variable_bundle(N_time_slots)
Vars_size=[1;N_time_slots;N_time_slots; N_time_slots;  N_time_slots; N_time_slots;  N_time_slots;N_time_slots;N_time_slots;N_time_slots;N_time_slots;N_time_slots    ];
end
function [A_block]=generate_Cplx_Constraint_format( Vars_size, Var_select,varargin)
total_size=sum(Vars_size);
temp1= tril(ones(numel(Vars_size),numel(Vars_size)))*Vars_size;
temp1(numel(Vars_size))=[];
Start_ind= [0;temp1]+1;
temp2=size( varargin{1} ,1);
A_block=zeros(temp2,total_size);
% A x+ By < b
for i=1: numel(Var_select),
A_block(:,Start_ind(Var_select(i)): Start_ind(Var_select(i))+ Vars_size(Var_select(i))-1 )=varargin{i};
end
end

Answer 1

[Ameer Hamza]

This problem is happening because load_kw is probably not a scalar, wheres your code seems to indicate it is a scaler. If It is a vector, you need to take care of the dimensions of the two matrices for multiplication.

[Baran Mehrdad]

actually this is the way I defined load_value:

    function [load_time_stamp, load_value]=get_the_actual_demand_data()
filename = 'dee1.csv';
delimiter = ',';
startRow = 2;
formatSpec = '%{MM-dd-yy HH:mm}D%*s%[^\n\r]';
fileID = fopen(filename,'r');
dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'HeaderLines' ,startRow-2);
delimiter, 'TextType', 'string', 'EmptyValue', NaN, 'HeaderLines' ,startRow-1, 'ReturnOnError', false, 'EndOfLine', '\r\n');
a = datestr(dataArray{1,1},'yyyy-mm-dd HH:MM');
load_time_stamp = cellstr(a);
fclose(fileID);
formatSpec = '%*s%f%[^\n\r]';
fileID = fopen(filename,'r');
dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'HeaderLines' ,startRow-2);
delimiter, 'TextType', 'string', 'EmptyValue', NaN, 'HeaderLines' ,startRow-1, 'ReturnOnError', false, 'EndOfLine', '\r\n');
load_value = dataArray{:, 1};
fclose(fileID);
end
  end

[Ameer Hamza]

But what is the value of load_kw when you run the code? The function in your comment does not tell what values are loaded in that variable.

[Baran Mehrdad]

it's Scalar . for each repeat in the simulation load_value has one value .

[Ameer Hamza]

Can you give the code where the value of load_kw is calculated and modified? It appears that initially, it might be a scalar but in next iterations, it becomes a vector. Alternatively, try changing the line as follow

[b_ineq_sec5]=load_kw .* ones(N_time_slots,1);

[Baran Mehrdad]

Here is the m file of this part . plz take a look at it.

[Ameer Hamza]

The line

N_time_slots=size(load_kw,1);

seems to indicate that load_kw is not a scalar. It is a vector. Put a breakpoint on the following line

   [b_ineq_sec5]=load_kw* ones(N_time_slots,1);

and check the value of load_kw right before execution of this line because the error message indicates that the value of load_kw is somehow not consistent for multiplication.

[Baran Mehrdad]

yes you were right. it's not scalar .and your alternative soulotion also worked and there is no sign of that error anymore. could you plz explain it ? and also i have a new error at the end of my code , new error is :

how can i solve it? it's again related to the m file that i sent before

[Ameer Hamza]

.* is element-wise multiplication whereas * is matrix multiplication. The second operator requires the matrix dimensions to be consistent.

While for your 2nd error, It seems that you might be accidentally mixing ',' and ';'. , add elements to same row while ; creates a new row. You can add a breakpoint at that line to diagnose the error.

[Baran Mehrdad]

thank you for the feedback. your information was so useful to me. regards