sprintf + calling value in nested structure

I need to loop through a set of structures/fields within a structure, 'dicom', to obtain specific reference numbers stored within the structure.

The reference number(s) that I am looking for can be called by: dicom.DVHSequence.Item_1.DVHReferencedROISequence.Item_1.ReferencedROINumber

However, the Item_# will change each time I call a reference number.

I have used sprintf to change the Item_# that I am calling:

 ref_ROI_num_file_name = sprintf('dicom.DVHSequence.Item_%i.DVHReferencedROISequence.Item_%d.ReferencedROINumber',h,h)

with a for loop to increment 'i' (which works).

However, after I use sprintf, I cannot seem call the field name. I have tried getfield() to no avail.

Answer 1

[Fangjun Jiang]

You can not use getfield() to get to the field more then one level below.

For example:

clear a;
a.item_1.b.c.item_1.d=1;

You can not run:

y=getfield(a,'item_1.b.c.item_1.d')

but you can use dynamic fieldnames:

ItemField=sprintf('item_%d',1);
y=a.(ItemField).b.c.(ItemField).d

[Tara Hackel]

Wonderful! Thank you!