Array creation with condition from another array

Hi,

I have an array like that x and I want to verify if two consecutive elements from it are 00,01,10 or 11, and at these conditions I will initialize in another array a single value like in the code:

x = randi([0,1],1,n);%n is input from a text box
for i=1:2:length(x)%i verify from 2 in 2 values from array
if(x(i)==0 && x(i+1)==0)
y(i)=1;
elseif(x(i)==0 && x(i+1)==1)
    y(i)=3;%and so on for 10,11
end
end

The problem is that how can I minimize the size of y array because in this way, the program assigns me 1 for y(0) and for y(1) the value from x(1). I want in a way to delete x(1) in order to remain only values from y(0),y(2),... and so on.

Answer 1

[Asmit Singh]

You can do this by mapping 2 consecutive indices to one index, ie. {1, 2} to 1, {3,4} to 2 and so on.. The following code should help

x = randi([0,1],1,n);%n is input from a text box
for i=1:2:length(x)%i verify from 2 in 2 values from array
    %j maps index for y to index for x
    j = fix(i/2)+1;
    if(x(i)==0 && x(i+1)==0)
        y(j)=1;
    elseif(x(i)==1 && x(i+1)==0)
        y(j)=2;
    elseif(x(i)==0 && x(i+1)==1)
        y(j)=3;
    else
        y(j)=4;
    end
end

[Sferle Alin-Tudor]

Thanks