Know the number of row within a structure (struct)

Hi! I have the following 'CODE' struct.

I would like to know if there is a code to determine the row number (present in 'Fields', for example 7) considering this as input:

folder = 'C:\Users\Alberto\Desktop\GLOBAL\DATA 4'

Thanks!

[Stephen23]

"(present in 'Fields', for example 7)"

The heading is misleading: the column headers are the fieldnames (e.g. "name", etc), the row numbers are indices of elements of the structure array (you can see there are 12 row numbers, exactly matching the number of elements in that 12x1 structure).

Note that "DATA 4" is listed in elements 7, 8, and 9 of that structure array.

[Alberto Acri]

@Stephen23 Yes, I know! I wanted to determine element 7 of struct CODE in correspondence of 'name' 'a'.

But the same is true for example at element 1,4,10 of struct CODE at 'name' 'a' where 'DATE 1', 'DATE 11' and 'DATE 6' are given respectively.

Answer 1

[Joseph Cheng]

so you can use the function find() and contains(). in this example i am just searching the name entry but it should work with your folder instead.

abc = 'a'-1;
for ind = 1:10
    CODE(ind).name = char(abc+ind);
end

foundRow = find(contains({CODE.name},'d'))

foundRow = 4

Where by doing {CODE.name} here it'll make each entry into a cell then find which one contains your desired text.

[Stephen23]

Using MATCHES will be more robust than CONTAINS.

To understand why consider searching for the name "DATA 1" in this array: ["DATA 1","DATA 2","DATA 11"]

[Alberto Acri]

Thank you for your reply @Joseph Cheng. I am not clear how to apply it to my code.

I had thought of putting:

abc = 'C:\Users\Alberto\Desktop\GLOBAL\DATA 4';
for ind = 1:10
    CODE(ind).folder = char(abc+ind);
end
foundRow = find(contains({CODE.folder},'d'))

but I didn't get the wished result.

[Stephen23]

@Alberto Acri: note that Joseph Cheng just used the loop to create some fake data to demonstrate how the code works. Of course you will not use the loop and you will use your own data. Try this to match the names:

foundRows = find(matches({CODE.name},'d'))

or if you want to match the folders (as your question specifies):

folder = 'C:\Users\Alberto\Desktop\GLOBAL\DATA 4'
foundRows = find(matches({CODE.folder},folder))

[Alberto Acri]

perfect @Stephen23!