how to obtain the mean for single variable/location of a multiple 3d .mat file ?

Question

Hanisah noh 2020-5-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/535834-how-to-obtain-the-mean-for-single-variable-location-of-a-multiple-3d-mat-file

评论： Ameer Hamza 2020-5-28

采纳的回答： Ameer Hamza

在 MATLAB Online 中打开

i have 240 files of 3dimension .mat files with 140x122x118

i have obtain the mean of these files using this method (credits to matlab community):

...
files=dir('*.mat');          
totalfile = numel(files);    
C = cell(1,totalfile);       
for a = 1:totalfile           
    T = load(files(a).name)   
    C(a) = struct2cell(T);   
end                          
M = cat(4,C{:}) 
M(isnan(M))=0               % replace NaN to 0 
ave = mean(M,4)             % mean of the 4th dimension 

however,

how do i obtain the mean of a single location/variable from all these 240 files, eg: location{100,10,50} ?

thank you

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Answer 1

Ameer Hamza 2020-5-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/535834-how-to-obtain-the-mean-for-single-variable-location-of-a-multiple-3d-mat-file#answer_440669

在 MATLAB Online 中打开

Something like this

files=dir('*.mat');          
totalfile = numel(files);    
V = zeros(1,totalfile);       
for a = 1:totalfile           
    T = load(files(a).name)   
    C = struct2cell(T);
    V(a) = C{1}(100,10,50)
end                          
V(isnan(V))=0               % replace NaN to 0 
ave = mean(V)

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Hanisah noh 2020-5-27

在 MATLAB Online 中打开

thank you Ameer Hamza

what does {1} indicates ?

..
V(a) = C{1}(100,10,50)
..

Ameer Hamza 2020-5-28

It is chained indexing in MATLAB. Normally chained indexing is not allowed in MATLAB because parenthesis are used both for functions and indexing. However, for cell arrays, chained indexing is allowed.

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