save each struct to vector-like format

Hi, i want to append each structs to the vector-like format.

And that struct will be a 'imregtform' function's output, 'tform'.

tform = {};

for i= X_dev
    
    fl_c = fl(i);
    fu_c = fu(i);
    
    tform= imregtform(fl_c,fu_c,'rigid',optimizer,metric);
    
    % I want to save that all tform during the for loop...
    
    tform_list{end+1}= tform; 
    % is this right? when i do this, the error is occured at 
    % reference part of code which load this 
    
end

save('tform_result.mat', 'tform_list');

Like the above code, during the for loop, new struct will made, and i want to save that new struct to vector-like format

(i don't know well about the matlab, so i don't know which format will appropriate to saving the struct)

i.e the final vector-like variable's each elemet will be a struct result

(p.s i want to save that final vector-like variable to .mat file, and load that file at another code, then take out each struct sequentialy. In this case,

is there a possibility that the value or shape of the struct may be damaged due to saving and loading? )

how can i do this? is there any good idea for this? and thank you for all responses.

[Matt J]

It's unclear how you would be storing a series of images fl in a way that could be indexed fl(i). Perhaps you have fl as a cell array?

Answer 1

[Matt J]

I think you have a misunderstanding about what a struct is. None of the variables in your code are structs. However, the following will give you a vector of tforms.

clear tform_list
tform_list(max(X_dev))=rigidtform2d();  %pre-allocate

for i= X_dev
    
    fl_c = fl(i);  %Should probably be fl{i}
    fu_c = fu(i);  %Should probably be fu{i}
    
    tform_list(i)= imregtform(fl_c,fu_c,'rigid',optimizer,metric);

end

save('tform_result.mat', 'tform_list');

[dayeon]

oh, i forgot to attatch this part, actually, the fu_c is the readed image ('.IMG' file, and readed format is uint 16), and the fl_c is made image using 'affine transform'.

and there are some modified part of the code, and i attatched final code at the following.

clear tform_list
tform_list(max(X_dev))=rigidtform2d();  %pre-allocate
for i= X_dev
    
    fl_c = fl(i);  %Should probably be fl{i}
    fu_c = fu(i);  %Should probably be fu{i}
    
    tform= imregtform(fl_c,fu_c,'rigid',optimizer,metric);
    
    tform_list{i} = tform;      % 1
    tform_list(i)= imregtform(fl_c,fu_c,'rigid',optimizer,metric); % 2
end
save('tform_result.mat', 'tform_list');

And the tform result looks like this.

sorry for the the mistake. If this is the case, what should I do? thank you :)

Plus, actually, i want to save that 'tform_list', using 'save()'function, to .mat format, and want to load that 'tform_list' at another script.

when i save that tform_list, it works at the saving script, but when i loaded it and want to use the element of 'tform_list', the error like 'there is no field of T' was occured... :(

is this error occures because of the saving or loading routine? (not because of the saving to tform_list?)

thanks a lot :)

[Matt J]

It doesn't change my answer, but you should read about cell arrays. Since you saved your results as a cell array, they will be a cell array when you load them back in, and need to be indexed the same way, with {}.

[dayeon]

thanks a lot!! :))