MATLAB Answers

Storing data from for loop

4 views (last 30 days)
Shaun on 27 Jan 2015
Edited: Stephen on 27 Jan 2015
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);
for s=1:length(FileName)
info=dicominfo([PathName FileName{s}]);
I(:,:,s)= [PathName, FileName(s), order]
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.
  1 Comment
Stephen on 27 Jan 2015
Note it is recommended to use fullfile rather than simply concatenating the path and filename strings.

Sign in to comment.

Accepted Answer

Stephen on 27 Jan 2015
Edited: Stephen on 27 Jan 2015
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));
Note how I looped from N->1, so that the cell array is correctly sized from the very first iteration (a kind of preallocation ).

More Answers (1)

Sara on 27 Jan 2015
Try replacing FileName(s) with FileName{s}

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!