Question with for loop 'Index in position 1 exceeds array bounds (must not exceed 9)'

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Trung Ngo 2019-6-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/465496-question-with-for-loop-index-in-position-1-exceeds-array-bounds-must-not-exceed-9

评论： Trung Ngo 2019-6-4

采纳的回答： per isakson

need_to_modify_code.mat

在 MATLAB Online 中打开

Hi all,

I don't know how to make sure index i not exceed the array bound in this case (since lats is a 9x13 matrix, NumCenPts is actually the matrix's number of columns and depends on the situation number of rounds can be larger then number of columns and vice versa). need_to_modify_code.m is attached below

NumCenPts = 13;
load('need_to_modify_code');
V=10;
for i=1:length(lats)-1
    for j=1:NumCenPts
        %------------------------------------------------------
        %Defining arcs and cost for going straight
        %------------------------------------------------------
        arcStraight(i,j)=distance('rh',lats(i,j), lons(i,j),lats(i+1,j),lons(i+1,j),referenceEllipsoid(7030));
        %Defining arcs and cost for going right
        %------------------------------------------------------
        if j<NumCenPts 
        arcRight(i,j)=distance('rh',lats(i,j),lons(i,j), lats(i+1,j+1),lons(i+1,j+1),referenceEllipsoid(7030));
        end
        %-------------------------------------------------------
        %Defining arcs and costs for going left
        %------------------------------------------------------
        if j>1
        arcLeft(i,j)=distance('rh',lats(i,j),lons(i,j), lats(i+1,j-1),lons(i+1,j-1),referenceEllipsoid(7030));
        end
   end
end

Thank you for your time,

Sincerely,

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Answer 1

per isakson 2019-6-4

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/465496-question-with-for-loop-index-in-position-1-exceeds-array-bounds-must-not-exceed-9#answer_377849

编辑：per isakson 2019-6-4

在 MATLAB Online 中打开

Line 9

arcStraight(ii,jj)=distance('rh',lats(ii,jj), lons(ii,jj),lats(ii+1,jj),lons(ii+1,jj),referenceEllipsoid(7030));

contains lats(ii+1,jj) and lons(ii+1,jj), which triggers the error when ii==9, since the size of lats and lons are <9x13>. 9+1 is 10 which is "outside" lons