# Error: Index in position 1 exceeds array bounds

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muhammad choudhry on 24 Nov 2020
Answered: Bjorn Gustavsson on 24 Nov 2020
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:
[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

Bjorn Gustavsson on 24 Nov 2020
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