Error: A(:) = B, the number of elements in A and B must be the same.

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Ammar Babikir 2018-2-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381980-error-a-b-the-number-of-elements-in-a-and-b-must-be-the-same

评论： Ammar Babikir 2018-2-11

采纳的回答： Image Analyst

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Hi everyone, I can't seem to understand why this piece of code:

 while( empty_cond ~= 0 &&  myStack.peek()~= goal)  
        %pop first index from the stack
        i = myStack.pop();
        %if node at i has not been visited
        if ( visited(i) == 0) 
            %mark it as visited
            visited(i) = 1;
            neighbors(i) = sense_maze(i, data);
        end

I end up getting this error:

In an assignment A(:) = B, the number of elements in A and B must be the same.

Error in RUNME (line 55) neighbors(i) = sense_maze(i, data);

I also attached a picture of the workspace.

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Image Analyst 2018-2-11

How are we to know which line threw that error? You forgot to include the complete error, which includes the line number and line of code. Please include ALL THE RED TEXT.

Ammar Babikir 2018-2-11

Oh sorry about that. i just edited my post. I included all the red text.

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Answer 1

Image Analyst 2018-2-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381980-error-a-b-the-number-of-elements-in-a-and-b-must-be-the-same#answer_304537

Two problems. First, sense_maze does not show up in your workspace so the code does not know about it at that point. Secondly data is a structure, not an integer starting from 1. So you need to get the integer from the structure.

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Image Analyst 2018-2-11

OK, if sense_maze is a function in a separate m-file on the search path, then that is okay. However the error message is acting like sense_maze is an array. Please attach that m-file so I can see what kind of input is expected for its second argument.

data is a structure, not a number - this is what the error message is telling you. So it has fields, like a, b, and myNumber or whatever. Save data to an mat file and attach that also.

Ammar Babikir 2018-2-11