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

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Ayobami Meadows 2023-1-25

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评论： Ayobami Meadows 2023-1-29

Mhelp.PNG

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

I got this error instead:

Error using isempty

Not enough input arguments.

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Ayobami Meadows 2023-1-29

Please can anyone help with a solution to this stated problem?

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回答（1 个）

Dyuman Joshi 2023-1-25

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编辑：Dyuman Joshi 2023-1-25

在 MATLAB Online 中打开

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