Code Error in MATLAB

Question

Fayyaz 2014-6-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/136853-code-error-in-matlab

评论： Image Analyst 2014-6-21

Hello All!. I need to create a matrix 81*81. I've done some coding below but it gives error (i.e. I need to get Base_Matrix, but at the end I get all the values zero). I've two matrices files i.e. A (61312*3) and B (246*1)

Total_Surveyed_Trucks=size(A,1);
Total_Survey_Number=max(B);
Base_Matrix=zeros(81,81);
for i=1:Total_Survey_Number
    Survey_Matrix=zeros(81,81);
    for j=1:Total_Surveyed_Trucks
        Origin=Survey(j,2);
        Destination=Survey(j,3);
        if Survey(j,1)==i
           if Origin~=Destination 
              Survey_Matrix(Origin,Destination);
           end
        end
    end
        Base_Matrix=Base_Matrix+Survey_Matrix;
end

Can anyone help me out? Thanks in advance.

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Answer 1

Star Strider 2014-6-21

1
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https://ww2.mathworks.cn/matlabcentral/answers/136853-code-error-in-matlab#answer_141890

在 MATLAB Online 中打开

I can’t run your code or simulate your data (I don’t know what it looks like), but this line:

Survey_Matrix(Origin,Destination);

is likely your problem. All it does is bring that value into the workspace. It doesn’t assign anything to it, or it to anything else.

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Fayyaz 2014-6-21

编辑：Star Strider 2014-6-21

在 MATLAB Online 中打开

I've done the below procedure but still get zero values in my base_matrix.

%%%%%%%%%%%%%%%%%%%%%%SurveyLocation%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%SurveyLocation(:,1)= Unique Survey Id 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%Survey%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Survey(:,1)= Unique Survey Id
%Survey(:,2)= Origin Province of the Truck
%Survey(:,3)= Destination Province of the Truck
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Total_Surveyed_Trucks=size(Survey,1);
Total_Survey_Number=max(SurveyLocation(:,1));
Base_Matrix=zeros(81,81);
for i=1:Total_Survey_Number
    Survey_Matrix=zeros(81,81);
    for j=1:Total_Surveyed_Trucks
        Origin=Survey(j,2);
        Destination=Survey(j,3);
        if Survey(j,1)==i
           if Origin~=Destination 
              Survey_Matrix(Origin,Destination)=Survey_Matrix(Origin,Destination)+SurveyLocation(i,1);
           end
        end
    end
        Base_Matrix=Base_Matrix+Survey_Matrix;
end

Star Strider 2014-6-21

在 MATLAB Online 中打开

I suspect that the condition:

Survey(j,i) == i

is never true, so your SurveyMatrix never gets updated.

Image Analyst 2014-6-21

Attach your m-file and data file(s) with the paper clip icon if you want more advice. Don't make us guess and waste our time. Make it easy for us to help you, not hard.

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