how can i know if x position of a vector is empty?

6 views (last 30 days)
im trying this to know if that element(1,2) is empty or zero, to make a decision from that condition
if (ps1(1,2))==0
i was watching function like isempty or ismissing but its doesnt works.
  1 Comment
per isakson
per isakson on 21 Jun 2022
IMO, never use the function length(M) when M is an array. With vectors its ok. Use size(M,1) and size(M,2), respectively.

Sign in to comment.

Accepted Answer

Image Analyst
Image Analyst on 21 Jun 2022
Element (1,2) of a numerical array will never be empty. It can't be. A whole array can be empty, or you can set a whole column or row of a matrix to null ([]) which will delete the column or row, but then it will be gone and the array will be smaller. It will not be empty.
To determine if that element is 0 you can simply do
if ps(1,2) == 0
% That element is 0.

More Answers (1)

Karan Kannoujiya
Karan Kannoujiya on 21 Jun 2022
Hi Erick,
So you want to check whether a element is ps1(in your case) is 0 or not.
So, isempty or ismissing function will not work here. Because 0 is itself a element. If in a vector there is 0 it doesn't mean it is empty or missing. For checking a vector element for 0 then you must check by indexing as you have done.
therefore, isempty function is used to check if a memory location is allocated whether there is an element present or not.
for e.g lets take a string str=["abc" "xyz" ""]
So, in str at pos 3 we have allocated memory but there is no element present there

Sign in to comment.


Find more on Resizing and Reshaping Matrices 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!