Creating an array with variables or a loop

Question

Karina 2014-6-26

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137838-creating-an-array-with-variables-or-a-loop

评论： Karina 2014-6-27

I have the next code:

for k=1:10
imDs{k}=imread([num2str(k),'.png']);
iGrisB{k} = imDs{k}(:, :, 3);
%Datos
media{k} = mean(iGrisB{k}(:));
Std{k}=std(double(iGrisB{k}(:)));
DMA{k}=mad(double(iGrisB{k}(:)));
MIN{k}=min(iGrisB{k}(:));
MAX{k}=max(iGrisB{k}(:));
Mode{k}=mode(double(iGrisB{k}(:)));
end
dat={media{1},Std{1},DMA{1},MIN{1},MAX{1},Mode{1}
media{2},Std{2},DMA{2},MIN{2},MAX{2},Mode{2}
media{3},Std{3},DMA{3},MIN{3},MAX{3},Mode{3}
media{4},Std{4},DMA{4},MIN{4},MAX{4},Mode{4}
media{5},Std{5},DMA{5},MIN{5},MAX{5},Mode{5}
media{6},Std{6},DMA{6},MIN{6},MAX{6},Mode{6}
media{7},Std{7},DMA{7},MIN{7},MAX{7},Mode{7}
media{8},Std{8},DMA{8},MIN{8},MAX{8},Mode{8}
media{9},Std{9},DMA{9},MIN{9},MAX{9},Mode{9}
media{10},Std{10},DMA{10},MIN{10},MAX{10},Mode{10}};
t=uitable;
ColNames={'Media','DS', 'DMA','Min','Max','Mode'};
set(t,'Data',dat,'ColumnName',ColNames, ...
'Position', [40 225 525 400])

My problem is that I want to find an easier way to do the part of dat={media{1},Std{1}...media{10},Std{10}} because they are not only 10 images, I need to process almost 60 images. Also it has to be in a flexible way, because not always I have to process 60 images sometimes less or more. Thank you. Regards.

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Answer 1

Jan 2014-6-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137838-creating-an-array-with-variables-or-a-loop#answer_142678

编辑：Jan 2014-6-26

在 MATLAB Online 中打开

You can create the output directly:

n = 10;
dat = cell(n, 6);
for k = 1:n
  imDs   = imread([num2str(k),'.png']);
  iGrisB = imDs(:, :, 3);
  B      = double(iGrisB(:));
  dat(k, :) = {mean(B), std(B), mad(B), min(B), max(B), mode(B)};
end

Another option is the original loop an this for the joining:

dat = cat(1, media, Std, DMA, MIN, MAX, Mode).';

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Karina 2014-6-27

Thank you it functions very well.

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Answer 2

Ben11 2014-6-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137838-creating-an-array-with-variables-or-a-loop#answer_142679

在 MATLAB Online 中打开

You can move the dat(...) inside your for-loop:

dat =cell(NumFiles,6); % NumFiles is the # of images you have.
for k=1:NumFiles
imDs{k}=imread([num2str(k),'.png']);
iGrisB{k} = imDs{k}(:, :, 3);
%Datos
media{k} = mean(iGrisB{k}(:));
Std{k}=std(double(iGrisB{k}(:)));
DMA{k}=mad(double(iGrisB{k}(:)));
MIN{k}=min(iGrisB{k}(:));
MAX{k}=max(iGrisB{k}(:));
Mode{k}=mode(double(iGrisB{k}(:)));
dat(k,:) = {media{k} Std{k} DMA{k} MIN{k} MAX{k} Mode{k}};
end
t=uitable;
ColNames={'Media','DS', 'DMA','Min','Max','Mode'};
set(t,'Data',dat,'ColumnName',ColNames, ...
'Position', [40 225 525 400])