# How to find number of objects in a structure?

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Ayesha ch on 19 Jun 2016
Commented: Ayesha ch on 20 Jun 2016
Hi I'm new to Matlab. I have the following struct array and I want to save the number of objects of struct in a variable. How can I find number of objects? Any help would be appreciated #### 1 Comment

What do you mean by 'object'? You mean the number of fields or the total number of things across every field? In your example you seem to just mean the number of elements in one field of the struct. If that is the case then you would be better always calculating it on demand to ensure you don't have to keep it up to date. Even better, use a class and a dependent property, but that s slightly more advanced.

Muhammad Usman Saleem on 19 Jun 2016
Let i am creating a structure s below
S = struct('a', 0, 'b', 1, 'c', 2);
Now when i am investigating what is inside of struture i type
>> S
S =
a: 0
b: 1
c: 2
Now i want to access value of its first feild(which is a)
S.a
ans =
0
for value of last feild, type this
S.c
ans =
2
now let's say i want to modify value( new value of 10) of last feild(c) of strutre S , do this
S.c=10
S =
a: 0
b: 1
c: 10
if you want to delete any field of struture S , use this
S.a=[]
S =
a: []
b: 1
c: 10
Usman

#### 1 Comment

Ayesha ch on 20 Jun 2016
Got it. Thank you so much!