How to check if a element of a struct is empty?

74 views (last 30 days)
Dear All,
I defined a struct and initialize it in the following way.
Res_All_Meas = struct([]);
[Res_All_Meas(1000).ind] = 0;
[Res_All_Meas(1000).res] = 0;
[Res_All_Meas(1000).xline] = 0;
[Res_All_Meas(1000).colnum] = 0;
Now in an iteration, I want to check if Res_All_Meas(i) is empty or not. If it is empty, I will assign some valeus to it.
Thanks a lot.
Stephen23 on 15 Oct 2020
"I want to check if the field contents are empty."
See my answer.
"The field contents for Res_All_Meas(i) are zero before Res_all_Meas(i) is assigned a value."
Not in your example. What you showed has all fields of every structure element Res_All_Meas(1:999) containing empty numeric arrays, and the last element Res_All_Meas(1000) for which each field contains 0.

Sign in to comment.

Answers (2)

Ameer Hamza
Ameer Hamza on 14 Oct 2020
Ameer Hamza
Ameer Hamza on 15 Oct 2020
You need to apply isempty on a particular field of a struct. Something like this
tf = ismpty(Res_All_Meas(1).ind)

Sign in to comment.

Stephen23 on 15 Oct 2020
Edited: Stephen23 on 15 Oct 2020
fun = @(s) all(structfun(@isempty,s)); % check the fields of a scalar structure.
idx = arrayfun(fun,Res_All_Meas); % indices of those structure elements with ALL fields empty.


Find more on Structures in Help Center and File Exchange


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by