how to resize a matrix two pair of two numbers stacked together?

i have a matrix like a = 1:16; %1x16 double to

I want a new matrix having

b = [1 2 9 10; 3 4 11 12; 5 6 13 14; 7 8 15 16]'; % 4x4 double

Two numbered pair to be rized to 4 by 4 matrix.

Can anyone please help. Any help is greatly appriciated.

Answer 1

[Abhijit Nayak]

According to my understanding you want to arrange the odd and the even numbers from a 1-D matrix into a 2-D matrix but with a certain arrangement.

I have given a code according to your given number list but it can be modified according to the requirement.

a = 1:16;
b=zeros(4,4); 
a_odd=zeros(1,16/2);
a_even=zeros(1,16/2);

x=1; y=1;

for i=1:16
    
    if rem(a(i),2)==0
        
        a_even(1,x)=a(i);
        
        x=x+1;
        
    else a_odd(1,y)=a(i);
        
        y=y+1;
        
    end
    
end

x=1; y=1;

for i=1:4
    
    for j=1:4
        
        if rem(i,2)==0
            
            b(i,j)=a_even(x);
            
            x=x+1;
            
        else
            
            b(i,j)=a_odd(y);
            
            y=y+1;
            
        end
        
    end
end
disp(b);

[MP]

that is what i wanted. thank you so much.....

Answer 2

[Karim]

you can do this with the reshape command:

a = (1:16)'

a = 16×1

1 2 3 4 5 6 7 8 9 10

b = reshape(a, 4, [] )

b = 4×4

1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16