Index exceeds the number of array elements (10)

Question

besaret koçak 2023-9-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2027474-index-exceeds-the-number-of-array-elements-10

评论： besaret koçak 2023-9-30

var=cell(CC.NumObjects,1) 
for j=1:1:n
% clear var
var(j,1)= var(double(image(CC.PixelIdxList{1,j})))
end
%

my code is like this. CC.NumObjects=10 and for example its consists of CC.PixelIdxList{1,1} = 369x1 array. Others consist of arrays like this. "CC.Pixel dxList{1,1}" values in this are pixel indices. I'm trying to measure the variance of the values corresponding to these indices in the image matrix. but it gives this error.

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besaret koçak 2023-9-30

在 MATLAB Online 中打开

var(j,1)= var(double(image(CC.PixelIdxList{1,j})))

I am trying to collect the variance values in a table with this row.

image(CC.PixelIdxList{1,j}) This function could be like this image(52) or image(100) or image(150) . 52 and 100 values are array indices. For example:

CC.PixelIdxList{1,7}

result

I should point out here that the image consists of a 255x237 matrix. So there are 255x237=60435 indeces. Here I take the indexes of certain regions and extract their values in the image matrix, like this:

GPR(CC.PixelIdxList{1,7})
ans =
  50×1 uint8 column vector
   117
   117
   116
   118
   117
   116
   117
   117
   116
   117
   118
   116
   118
   117
   117
   117
   117
   117
   118
   117
   117
   117
   117
   116
   117
   117
   116
   117
   116
   117
   117
   117
   117
   117
   117
   117
   117
   117
   116
   117
   116
   116
   117
   116
   116
   117
   116
   116
   116
   116

Here, the equivalent of 26661 index is given as 117. others in the same way. I want to find the variance of these values. When I remove this code from the for loop and run it for the first time, it does not give an error, but the second time I run it, I get this error.

 Index exceeds the number of array elements (10).
Error in imageContour (line 26)
var(j,1)= var(double(GPR(CC.PixelIdxList{1,j})))

Dyuman Joshi 2023-9-30

编辑：Dyuman Joshi 2023-9-30

在 MATLAB Online 中打开

Attach the data you are working with. Use the paperclip button to do so.

Once again, why are you trying to use an empty cell array as a variable as and then over-writing it?

var{j,1} = var(double(image(CC.PixelIdxList{1,j})));

Edit - I seemed to have forgotten that var is a built-in MATLAB function :')

besaret koçak 2023-9-30

Dyuman Joshi Thank you for your help :)

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Answer 1

Voss 2023-9-30

1
链接

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https://ww2.mathworks.cn/matlabcentral/answers/2027474-index-exceeds-the-number-of-array-elements-10#answer_1322744

在 MATLAB Online 中打开

Avoid naming your variable var, since that is the name of a function you are trying to use. Also, a cell array doesn't appear to be required; you can use a numeric vector to store the results.

var_result = zeros(n,1);
for j = 1:n
    var_result(j,1) = var(double(GPR(CC.PixelIdxList{1,j})));
end

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besaret koçak 2023-9-30

Thank you, the error has been resolved. I changed the variable name from "var" to "var_result" and it did not give an error.

Voss 2023-9-30

You're welcome!

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