conditional 'if else' statementS

Question

Aadhar Anand 2021-4-17

评论： Atsushi Ueno 2021-4-17

hi , can you please tell me , whether we can use colon operator (:) in if statements or not? if yes, can you please write a simple code.

Answer 1

Atsushi Ueno 2021-4-17

I should say NO for this question. But there are various way to judge each elements of vector.

I think you require 3 judgements (from 3 to 5) for this example, but the result is only once 'FALSE exist'.

It means if([true true false]) is judged as false.

a = ones(1,10);
a(5) = 0;
if(a(3:5))
    disp 'all TRUE';
else
    disp 'FALSE exist';
end

Walter Roberson 2021-4-17

if(a(3:5))

That is a valid example of using : in an if statement, so the answer should be YES, it can be used.

Other examples:

 if all('abc' == 97:99)
 if a(:) * 2.^(0:3) == 11    %converts 4 bit binary to decimal and compares to 11

Atsushi Ueno 2021-4-17

It's a matter of wording.

Yes, we can use colon operator (:) in if statements, but No, it cannot separate if statement and else statement for judgement of each element.