Creating a script with if statements

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Cside
Cside on 30 Aug 2019
Commented: Cside on 2 Sep 2019
Hello. I would like to create a script but am still a little new to flow control. I have a matrix A of numbers (100 x 2) , of which I would like to sort them according to whether they fulfill the criteria of having x in column 1 and y in column 2.
So I have this now:
x = 2:4 & y= 2:4
if A(: , 1) == x & A(:,2) ==y;
I would like the script to create a logical matrix as answer for this, should end up with 9 of them.
Thank you!

Accepted Answer

Guillaume
Guillaume on 30 Aug 2019
Edited: Guillaume on 30 Aug 2019
In matlab, if statements should be your last resort. By necessity if statements apply to scalars so they tend to force you to use loops.
I'm not very clear on what you're trying to achieve, if you're trying to find all rows of a matrix whose 1st column values re in set x and 2nd column values are in set y, you'd use:
isinset = ismember(A(:, 1), x) & ismember(A(:, 2), y)
If x and y are equal, you could simplify the above to:
isinset = all(ismember(A, [2, 3, 4]), 2)
As you can see, no loop or if required.
  3 Comments
Cside
Cside on 2 Sep 2019
ah i see, i think rather than creating a script, creating a function will be more ideal for me. Accepted the answer for the new knowledge learnt :) thank you

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