How to create a loop generating bins for the group of data in cell array

Question

Iuliia Myrgorodska 2020-4-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/520676-how-to-create-a-loop-generating-bins-for-the-group-of-data-in-cell-array

评论： Iuliia Myrgorodska 2020-4-25

采纳的回答： Sriram Tadavarty

在 MATLAB Online 中打开

Hi everyone,

I am a newby to MathLab and I need some help from the community.

I am trying to figure out how to loop a simple histcounts function.

I have a data set which I separtated into cell arrays with accumarrays

So now I have a cell array GC{121:1} which contain 121 separate matrixes (double values). Each of those matrixes has 2 columns and diferent numer of rows (2 x n matrix ).The first colunm is the number of slice indicating were data were extracted from.

I would like to split each matrix into 10 equal bins by the second column. So far I got to this:

But the loop I wrote dose not work

GC = accumarray(data(:,1),(1:size(data,1)),[],@(x){data(x,:)});
% Distribute x_point column into 6 equally spaced bins..
for i=1:121
[N,edges] = histcounts(GC{i,1},10);
end

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Iuliia Myrgorodska 2020-4-25

Yes,

that's exactly the problem I have. Do you know how can I fiix this?

Iuliia Myrgorodska 2020-4-25

How can I save the result in another set of cel arrys? so that I get the results from all iteration as one set?

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Answer 1

Sriram Tadavarty 2020-4-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/520676-how-to-create-a-loop-generating-bins-for-the-group-of-data-in-cell-array#answer_428376

在 MATLAB Online 中打开

Hi Luliia,

The problem here is that the variables N and edges are overwritten with the latest value each time in the for loop.

You can try the following:

GC = accumarray(data(:,1),(1:size(data,1)),[],@(x){data(x,:)});
% Distribute x_point column into 6 equally spaced bins..
N = cell(1,121);
edges = cell(1,121);
for i=1:121
[N{i},edges{i}] = histcounts(GC{i,1},10);
end
% To access the first value in N, it can be done through N{1}