Index in position 1 exceeds array bounds (must not exceed 7).

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YAAQOB AL-JAMALI 2022-9-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1812185-index-in-position-1-exceeds-array-bounds-must-not-exceed-7

评论： YAAQOB AL-JAMALI 2022-9-26

I am trying to locat the collide segments then add a midpoint between the starting and end point of the collide segment, but I keep getting the message "Index in position 1 exceeds array bounds (must not exceed 7)."

iwant = [284	377; 287	378 ; 291	380; 295	381; 298	382; 302	383; 306	384; 310	385; 314	386; 319	388; 323	389];
pathReduced = [277 37; 326	126; 358	139; 334	166; 222	184; 166	397; 475	405]
PQ = iwant;
P = pathReduced;
count = 0;
%% Find the nearest point for each point in 'collidePoints'relavent to 'referencePoints'
k = dsearchn(P,PQ);
%% Adding a midepoint between the nearest point in pathReduced and the consecutive one
for kk = 1:length(k)
    p_nearest = [P(k(kk),1), P(k(kk),2)];
    p_nearestCon = [P(k(kk)+1,1), P(k(kk)+1,2)];
    midPoint = [round((p_nearest(1,1) + p_nearestCon(1,1))./2),...
        round((p_nearest(1,2) + p_nearestCon(1,2))./2)];
    idx = k(kk) + 1;
    count = count + 1;
    pathReducedRefined = [[P((1:idx-1),1),P((1:idx-1),2)];...
        midPoint; [P((idx:end),1),P((idx:end),2)]] ;
    
end

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Answer 1

Karim 2022-9-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1812185-index-in-position-1-exceeds-array-bounds-must-not-exceed-7#answer_1060765

在 MATLAB Online 中打开

I indicated in your script where the issue lies, in short:

P is a 7x2 matrix.
when kk == length(k), it means that k(kk) = 7
Hence when you are try to acces P(k(kk)+1, 1), you try to acces P(8,1) which doesn't exist and hence the error is thrown.

iwant = [284	377; 287	378 ; 291	380; 295	381; 298	382; 302	383; 306	384; 310	385; 314	386; 319	388; 323	389];
pathReduced = [277 37; 326	126; 358	139; 334	166; 222	184; 166	397; 475	405];
pathReduced = 7×2
   277    37
   326   126
   358   139
   334   166
   222   184
   166   397
   475   405
PQ = iwant;
P = pathReduced;
count = 0;
%% Find the nearest point for each point in 'collidePoints'relavent to 'referencePoints'
k = dsearchn(P,PQ);
k'
ans = 1×11
     6     6     6     6     6     6     6     6     6     6     7
%% Adding a midepoint between the nearest point in pathReduced and the consecutive one
for kk = 1%:length(k)
    p_nearest    = [P(k(kk)  ,1), P(k(kk  ),2)];
    p_nearestCon = [P(k(kk)+1,1), P(k(kk)+1,2)];
    %                               ^^^^^^^ the problem lies here...    
    midPoint = [round((p_nearest(1,1) + p_nearestCon(1,1))./2),round((p_nearest(1,2) + p_nearestCon(1,2))./2)];
    idx = k(kk) + 1;
    count = count + 1;
    pathReducedRefined = [[P((1:idx-1),1),P((1:idx-1),2)];midPoint; [P((idx:end),1),P((idx:end),2)]] ;
     
 end