how to know first element in Data struct

i want the first element of all field in struct

>> whos Sis

Name Size Bytes Class Attributes

Sis 1x351 120517682 struct

Sis(1).data(1)

ans =

datetime

2008-01-01

but i want to know Sis(1).data(1) for all element in struct(351 element)

i can't to use

data=[Sis.data];

Error using datetime/horzcat

Dimensions of arrays being concatenated are not consistent.

Answer 1

[Stephen23]

arrayfun(@(s)s.data(1),Sis)

[Stephen23]

Lets try it:

S = struct('data',{datetime(2023,11,1:5),datetime(2023,1,1:4)},'other',{eps,pi})

S = 1×2 struct array with fields:
    data
    other

arrayfun(@(s)s.data(1),S)

ans = 1×2 datetime array
   01-Nov-2023   01-Jan-2023