Error: Index in position 1 exceeds array bounds

Question

muhammad choudhry 2020-11-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/660518-error-index-in-position-1-exceeds-array-bounds

回答： Bjorn Gustavsson 2020-11-24

frame14.png

Hi,

I would like my code to stop at the last value but it is exceeding 1 point more and giving me an error, can anyone help

Code:

I=imread('frame14.png'); %Read the Image

[C,h] = imcontour(I,[-1000 30]); % store the C from the contour

Contours_matrix = C' %transpose the rows into columns

Y_Coordinates = Contours_matrix(:,2) %extract the second column (Y-values)

Current_Rowindex=1

counter=0

while Current_Rowindex < size(Y_Coordinates,1)

counter = counter+1

Rowindices(counter) = Current_Rowindex

Current_Rowindex = Current_Rowindex+Y_Coordinates(Current_Rowindex,1)+1

end

Rowindices_1=Rowindices'

for i= 1:length(Rowindices_1)

co_ordinates(i,1) = Y_Coordinates(Rowindices_1(i,1)+1:Rowindices_1(i+1)-1,1)

end

Error:

Index in position 1 exceeds array bounds

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Answer 1

Bjorn Gustavsson 2020-11-24

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在 MATLAB Online 中打开

I think you would benefit from using the fact that there is information about the number of elements in a contour-segment in C. The first column of C are the column-vector with contour-level and number of elements. That is you get the level and number of elements of the first contour-segment like this:

C_level(1) = C(1,1);
N_elements(1) = C(1,1);

Then you have the same information about the next contour-segment at C(:,2+N_elements(1)). That way you can count off the contour-segments and make sure that you stop before the end of C - you will have to check that 2+N_elements(end) is smaller than size(C,1). (These are before your transposing).

HTH