About vector comparasion question.

Hi, I know I have asked the similar question, I want to write a if statement that compare vectors, like a, b is 3 dimensional vector, however if a<=b returns a 3-dim vector that do the comparison for each entry.

Is there a command just do a whole comparison at once? Thanks.

Answer 1

[Mahdi]

Have you tried using the 'or' operator?

if size(a,2)==3 | size(b,2)==3
...
elseif size(a,1)<=size(b,1)
...
end

Sorry, you weren't very clear, but I hope some of the above will help.

[C Zeng]

Yes, but dimensional of a and b can be many, so compare them one by one is not convenient. I am wondering does MATLAB have a function to do so?

Thanks.

[Matt Kindig]

Yes, you want to use either all() or any():

if all(a<=b),    %true if every a(i) <= b(i)
   ....
end

if any(a<=b),   %true if at least one a(i) <= b(i)
...
end

[C Zeng]

Oh, yes, thanks, that function is very helpful!

[Jan]

@C Zeng: Flagging is used to tell the admins and editors, that a message violates the using conditions of the forum. Please press the "Accept" button instead of setting a flag. Thanks.

[C Zeng]

Sorry about that Jan! Thanks!