Storing data from for loop

Question

Shaun 2015-1-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/172438-storing-data-from-for-loop

编辑： Stephen23 2015-1-27

Hi all,

I'm new to Matlab and trying to create a for loop that will save information gathered from a DICOM file into a mtrix for further use. My code so far is as follows...

        [FileName PathName] = uigetfile('*.*','Select DICOM File', 'MultiSelect','on');
        im1=dicomread([PathName FileName{1}]);
        [r c]=size(im1);
        I=[];
        order=[];
        for s=1:length(FileName)
            info=dicominfo([PathName FileName{s}]);
            order=info.SliceLocation;
           I(:,:,s)= [PathName, FileName(s), order]
        end

I get the following error when running the code...

Conversion to double from cell is not possible.
Error in Untitled3 (line 11)
   I(:,:,s)= [PathName, FileName(s), order]

Any help would be much appreciated. I apologise if any forum rules have not been followed.

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Stephen23 2015-1-27

Note it is recommended to use fullfile rather than simply concatenating the path and filename strings.

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Answer 1

Stephen23 2015-1-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/172438-storing-data-from-for-loop#answer_166086

编辑：Stephen23 2015-1-27

在 MATLAB Online 中打开

You define I to be of class double with the line I=[];, and you then try to allocate some data into it that is of class cell. Thus the error message.

One alternative it to not preallocate this variable (or even the variable order) and just refer to them first in the loop:

[FileName,PathName] = uigetfile('*.dcm','Select DICOM File', 'MultiSelect','on');
for n = numel(FileName):-1:1
    dcinfo = dicominfo(fullfile(PathName,FileName{n}));
    %order = dcinfo.SliceLocation; % not in the documentation.
    out{n} = fullfile(PathName,FileName(n));
end