Change the zeros to ones and the ones to zeros.

I don´t know why my code to change the ones for zeros and the zeros to ones doesn´t work.

This is my code:

V = [ 1, 1, 1, 1, 0, 1, 0, 1]

V(V==0) = 1;

V(V==1) = 0;

C1 = [ 1, 1, 1, 1, 1, 1, 1, 1, 1, V(2:8)]

Answer 1

[Steven Lord]

Let's look at V after the second and third steps:

V = [ 1, 1, 1, 1, 0, 1, 0, 1]

V = 1×8

1 1 1 1 0 1 0 1

V(V==0) = 1

V = 1×8

1 1 1 1 1 1 1 1

V(V==1) = 0

V = 1×8

0 0 0 0 0 0 0 0

You want to record which elements of V were equal to 1 before replacing all the 0 values with 1.

V = [ 1, 1, 1, 1, 0, 1, 0, 1];
previousOnes = V == 1;
V(V == 0) = 1;
V(previousOnes) = 0

V = 1×8

0 0 0 0 1 0 1 0

Or since you want to change 0 to 1 and vice versa, just subtract V from 1.

V = [ 1, 1, 1, 1, 0, 1, 0, 1];
newV = 1-V

newV = 1×8

0 0 0 0 1 0 1 0

Or use the not operator. Depending on what you want to do with it afterward you may need to convert it back to double by calling double() on it.

V = [ 1, 1, 1, 1, 0, 1, 0, 1]

V = 1×8

1 1 1 1 0 1 0 1

newV2 = ~V

newV2 = 1x8 logical array
   0   0   0   0   1   0   1   0

newV2D = double(newV2)

newV2D = 1×8

0 0 0 0 1 0 1 0

[Julen Vicente Pipaon]

Thank you so much.

Answer 2

[emjey]

you can do it in one line like this

>> V = [ 1, 1, 1, 1, 0, 1, 0, 1];
>> abs(V-1)
ans =
     0     0     0     0     1     0     1     0