How to remove entries that contain NaN from a struct array in Matlab?

Question

I have a struct array a :

a(1).s1 = NaN
a(2).s1 = 2
a(3).s1 = 4
a(4).s1 = 3

a(1).s2 = 1
a(2).s2 = NaN
a(3).s2 = NaN
a(4).s2 = 5

Ideally, I would like to create another struct array b without entries where s2 contains NaN . So the new array b would look like this:

b(1).s1 = NaN
b(2).s1 = 3

b(1).s2 = 1
b(2).s2 = 5

I need this done automatically so I can apply the script to a much larger struct array.

I've been trying to create a for loop like this:

i = 1;
for i = find(all(~isnan([a(1:4).s2]), 1));
    b(i).s1 = a(i).s1;
    b(i).s2 = a(i).s2;
end

but it keeps empty entries.

Another attempt to remove entries with NaN :

b = a;
i = 1;
for i = find(all(isnan([b(1:4).s2]), 1));
    b(i) = [];
end

only works for the first NaN . Then it loses i count and removes incorrect entries.

Please help me out, if anyone knows how to do it.

Answer 1

You were really close to solving this but the for loop is a bit problematic so you should use array formula like this:

b = a(~isnan([a.s2]));

I hope this will help you.