How to select true values ?

I have 2 matrices and 4 conditions for it

like positive positive negative positive positive negative abd negative negative

i have converted them into indices matrix

and now it should go further when the answer is true

if true
  % code
A=[-1,2,3,4,-5]
 B= [-6,-7,8,9,10]

   i1=A<0;i2=A>0;i3=B<0;i4=B>0;

for example in i1 and i3 how can select 1 and 1 on the same index

here -1 and -6 and the go further

[madhan ravi]

whats your desired result? give an example

Answer 1

[madhan ravi]

>> A=[-1,2,3,4,-5]
 B= [-6,-7,8,9,10]
   i1=A<0;
   i2=A>0;
   i3=B<0;
   i4=B>0;

         AA= A(i1 & i3)
          BB=B(i2 & i4)

A =

      -1     2     3     4    -5

B =

      -6    -7     8     9    10

AA =

      -1

BB =

       8     9

>>

[madhan ravi]

Like the above maybe?

Answer 2

[Walter Roberson]

i1 & i3