Matlab: structures with variable name as index

Question

I am not sure this is possible in Matlab but wanted to make sure.

I have structures as:

x = struct();
x.val1 = 5;
x.val2 = 7;

y = struct();
y.val1 = 15;
y.val2 = 17;

I want to create a structure DataStore as:

DataStore = struct;
DataStore(x).val1 = 5
DataStore(x).val2 = 7
DataStore(y).val1 = 15
DataStore(y).val2 = 17

OR

DataStore = struct;
DataStore('x').val1 = 5
DataStore('x').val2 = 7
DataStore('y').val1 = 15
DataStore('y').val2 = 17

So, I am using the name of the original structure variables as index for DataStore.

Is the above feasible ?

Edit:

I aim to use DataStore as following:

disp( DataStore('x').val1 )
disp( DataStore('y').val2 )

Are you looking for the concatenation of structs in MATLAB?

Matthias W.
– Matthias W.

2016-03-19 21:24:25 +00:00
Commented Mar 19, 2016 at 21:24 — Matthias W.
– Matthias W., Commented Mar 19, 2016 at 21:24
Why not just do Datastore.x.val1 = 5, etc.?

Suever
– Suever

2016-03-19 21:37:33 +00:00
Commented Mar 19, 2016 at 21:37 — Suever
– Suever, Commented Mar 19, 2016 at 21:37

Daniel · Accepted Answer · 2016-03-19 21:45:11Z

4

Use a struct, maybe with dynamic field names.

Either:

DataStore.x.val1=6
DataStore.x.val2=9

Alternative with dynamic filed names (result is the same):

f='x'
DataStore.(f).val1=6
DataStore.(f).val2=9

In case val1 and val2 are not just placeholders, concider replacing them with an array:

DataStore.(f).val(1)=6
DataStore.(f).val(2)=9

answered Mar 19, 2016 at 21:45

Daniel

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1 Comment

patrik Over a year ago

Worth noting is that fields can be accessed using strings as well. disp( DataStore.('x').val1 ) or disp( DataStore(f).val1 ). It is kind of implied, but it might be worth being explicit with reading and writing. Still, +1

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