Data changing when I move it from one struct to another

Hello!

I'm writing a code which pulls data from one struct to a new struct (for organization purposes) from a directory.

For example I move it from something like
% new struct = old struct
b(1).A.eegData = data.eeg_Data

when I do this and call on b(1).A.eegData, I get an answer that looks like this [32 x 1234245] single that I can't view even in variable editor

while the original looks like a nice matrix of columns and rows containing data...

this also happens for smaller sets of data (eg. a 1 X 5 data set)

b(1).A.question1 = oldData.A.q1 (1:5);

I end up with [1 x 5] single instead of ans = 1 2 3 4 5

Am I doing something wrong, or is everything fine and I'm just not familiar with MATLAB to realize how to access my data

Thanks, ML

[Nitin]

did you initialize your array?

Answer 1

[Muthu Annamalai]

I find your claim surprising, i.e. copying MATLAB data array from one variable to another, changes dimensions. This is very unlikely, and it is a bug if it is true.

For, example, the following code,

>> clear all
>> z=rand(5,100);
>> a(1).b.C = z;
>> size(a(1).b.C)

ans =

       5   100

>> size(a(1).b.C)

works as expected, copying and preserves the data dimensions on uninitialized variables

If this is not the case, I am missing something about your data structures. What kind is data.eeg_data ? Is it a struct, cell-array, matrix, strings??

Answer 2

[Jan]

It depends on what exactly "I get an answer" means here. When the contents of a struct is displayed in the command window, such abbreviated information is shown.

c.d = rand(2,2)

displays:

   c = 
     d: [2x2 double]

So I think the copy works well and only the display in the command window differs from your expectations.