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Writing IF STATEMENT that omits empty fields in different arrays of a structure

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I need writing an if statement that would exclude empty fields in a structured array (pictured attached). I am to make use of non-empty fields of M.id, M.xd and M.yd. I came up with this but not working:
for i=1:1:n % n is 100
if ~isempty M(i) % this is where my problem lies
for z=1:t % t is 5
min_dis_local=inf;
distanceL=sqrt( (S(i).xd-(M(z).xd) )^2
end
end
end
I got this error instead:
Error using isempty
Not enough input arguments.

Antworten (1)

Dyuman Joshi
Dyuman Joshi am 25 Jan. 2023
Bearbeitet: Dyuman Joshi am 25 Jan. 2023
You need to use () with isempty, otherwise it would assume the input to be a string array
y = [];
isempty(y)
ans = logical
1
isempty y
ans = logical
0
%even though x is not defined, it returns 0 when checked with isempty
isempty x
ans = logical
0
When you add ~ operator before isempty without (), it will through you an error, which is what you encountered
~isempty y
  5 Kommentare
Dyuman Joshi
Dyuman Joshi am 29 Jan. 2023
What is the full error you get when you run this code?
Ayobami Meadows
Ayobami Meadows am 29 Jan. 2023
Index exceeds the number of array elements (127)
Error in Demo_code (line 54) if ~isempty(M(i))

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