Creating an array out of a for loop.

Using a for loop to create an array of file information however when I run the code I get an array of the correct size but only one cell had data in it...

struct = cell(length(fileID), 3);
for j = 1:length(fileID)

    fID = char(fileID(j));

    if exist(fID, 'file');
        info = dicominfo(fID);

        serDes = info.SeriesDescription;
        instNo = info.InstanceNumber;
        sliceLoc = info.SliceLocation;

        L = length(fID);
        fName = fID(L-2:L);
        struct{k} = [fName, serDes, instNo];
    else
    end
    end
Struct

Any help would be great!

Answer 1

[Guillaume]

A few things of note:

• struct is a very common matlab function, don't use this as a variable name regardless of its content.
• cell arrays and structure are two different container, so don't name a cell array struct or structure or anything that hints at structure. It's just plain confusing to anyone reading your code.
• Learn to use the end keyword. These two lines:

        L = length(fID);
        fName = fID(L-2:L);

are equivalent to:

        fName = fID(end-2:end);

With that said, the cause of your problem is pretty simple. You're using k as an index to store values in your cell array, whereas your loop index is j. k never changes within your loop.

[Shaun]

Thanks for your quick response. That was a stupid mistake.... Thanks for the other hints as well! After editing my code I get an array which has two empty columns in each row and the first column has all of the information from the loop...

   'Z22Calibration Scan/'    []    []
      'Z23Calibration Scan2'    []    []
      'Z24Calibration Scan3'    []    []
      'Z25Calibration Scan6'    []    []

How do I fix this so that that each set of information is in its own column? e.g...

'Z25'     'Calibration Scan'   [Number]

[Guillaume]

Assuming you've called your cell array mycell:

   mycell(j, :) = {fName, serDes, instNo};

[Shaun]

Thank you very much!