Sorting Struct elements in Numerical order

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Md Farhad Mokter
Md Farhad Mokter 2019-6-6
评论： Stephen23 2021-5-4
I have a program which takes some pictures in a struct and performs some pixel counting in each of the pictures. After running the program when I see the struct, the elements are not arranged in the way I want them to be. Here is the code-
img_folder = ('C:\Users\mm\work\blackpixelcount');
filenames = dir(fullfile(img_folder,'*.JPG'));
Total_image = numel(filenames);
for i= 1:Total_image
f = fullfile(img_folder,filenames(i).name);
im= imread(f);
bw= imbinarize(im);
out=nnz(~bw);
get(i)=out;
end
after running the code I see the struct and its sorted as given below-
x.JPG
Now I want the elements to be sorted in numerical ascending order (1,2,3.....9,10,11,12..).
I might be makigs some mistakes there, since I am biggener in matlab. Help will be really appreciated.

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KSSV
KSSV 2019-6-6
  9 个评论
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Stephen23
Stephen23 2019-6-6
编辑：Stephen23 2019-6-6
"But the 'filenames' variable remained same as before"
Sure. You only define it once (on the second line of your code), nowhere else in your code do you make any changes to filenames. You assigned the output of natsortfiles to variable b, so b contains the sorted filenames.
Follow the examples in the natsortfiles documentation.
Jan
Jan 2019-6-6
编辑：Jan 2019-6-6
@Md Farhad Mokter: Use this:
img_folder = ('C:\Users\mm\work\blackpixelcount');
filelist = dir(fullfile(img_folder,'*.JPG'));
filenames = {filelist.name}; % added
b = natsortfiles(filenames);
Total_image = numel(b);
getList = zeros(1, Total_image); % Pre-allocate, avoid "get" as name
for i = 1:Total_image
f = fullfile(img_folder, b{i}); % not b(i).name
im = imread(f);
bw = imbinarize(im);
getList(i) = nnz(~bw);
end
get is an important Matlab command, so avoid using it as name of a variable.

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Md Farhad Mokter
Md Farhad Mokter 2019-6-6
@Stephen Cobeldick sir,
it worked !!
After reading the documentation part once again, I edited the code in line 3 and line 4.
img_folder = ('C:\Users\mm\work\blackpixelcount');
filenames = dir(fullfile(img_folder,'*.JPG'));
[~,ndx] = natsortfiles({filenames.name});
filenames = filenames(ndx);
Total_image = numel(filenames);
for i= 1:Total_image
f = fullfile(img_folder,filenames(i).name);
im= imread(f);
bw= imbinarize(im);
out=nnz(~bw);
get(i)=out;
end
Now It is all good. My apologies for mistakes and thank you so much.
@Jan, Thank you for the help. I will now give it a try.

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