Error "Argument must contain a string"

Question

Ken 2015-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/259285-error-argument-must-contain-a-string

回答： Arnab Sen 2015-12-29

I am trying to code a program to find the least path for a robot but get above error. My code is:

while(currentCell ~= SearchStart)
    %Take the cell where you are right now and its 8 neighbours, and store it in a variable
    u=currentCell(1);
    v=currentCell(2);
      neighborhood8 = SearchSolution(v-1:v+1, u-1:u+1);
          %Assign an Inf value to the cell you are on right now, so that it doesn't interfere when finding the minimum of the neighborhood array
      neighborhood8(2,2) = Inf;
       %end
      %end 
      %Find the minimum element and its index in the 8-neighborhood
      [path(i+1,1), path(i+1,2)] = find(neighborhood8==min(min(neighborhood8)));
      %Increment the index of the OptimalPath array last element
      i = i + 1;
end
OptimalPath = path;

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Answer 1

Arnab Sen 2015-12-29

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在 MATLAB Online 中打开

I understand that you are getting an error while trying to execute the code. This kind of issue might arises while there is a naming conflict among the user defined function or variable and in built function or variable.

I notice that in your code you use 'path' as a 2-D matrix. But MATLAB has an inbuilt function 'path' which accepts string. I suspect MATLAB treats your 'path' matrix as 'path' function call and throws an error as it does not get a string as input argument. Try change the name of the matrix 'path' some other variable. You can verify which function/variable is considered by MATLAB by executing the following command in MATLAB command window:

>>which -all path