how to formulate if statement for a vector?

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Shubham Mohan Tatpalliwar
评论： Shubham Mohan Tatpalliwar 2018-10-18
A=[-3,-2,-1,1,2,3]
B=[-3,-2,-1,2,3,4]
i have 4 condition and have to slect only one when it satisfies.
  1. negative A negative B i.e. A=[-3,-2,-1,0,0,0] B=[-3,-2,-1,0,0,0]
  2. negative A positive B .
  3. positive A negative B.
  4. positive A positive B.
How can i select only one condition if input is in vector.
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Steven Lord
Steven Lord 2018-10-15
The elements at some of the locations of your vectors satisfy your first condition. Others satisfy the fourth condition. Do you want to choose one of those conditions at random and apply it to the entire A and B vectors, or do you want to apply the condition that each pair of corresponding elements satisfies to that element of the result?
What do you want to do if none of the conditions are satisfied?
A = zeros(1, 6);
The elements of A are neither positive nor negative.
Shubham Mohan Tatpalliwar
Shubham Mohan Tatpalliwar 2018-10-16
each pair of corresponding elements satisfies to that element of the result?
What do you want to do if none of the conditions are satisfied?
it would not happen.
also if the one condition does not satisfy the answer would be zero

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Torsten
Torsten 2018-10-15
编辑：Torsten 2018-10-15
if A<=0 & B<=0
...
elseif A<=0 & B>=0
...
elseif A>=0 & B<=0
...
elseif A>=0 & B>=0
...
end
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Jan
Jan 2018-10-17
If A and B are vectors, the expression
if A<=0 & B<=0
is converted internally to:
if all(A(:)<=0 & B(:)<=0) & ~isempty(A) & ~isempty(B)
Writing this explicitly is less confusing in my opinion. Array-valued conditions of if commands are a frequent source of bugs.

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