Matrix elements movement in MATLAB

HI, I want to move the matrix elements as desired like

a=[1 2 3 4; 
 5 6 7 8;
 9 10 11 12;
 13 14 15 16]

now i want to make it

a=[3 4 8 7;
 11 12 16 15;
 14 13 9 10;
 6 5 1 2]
how can i do it in MATLAB

Answer 1

[Azzi Abdelmalek]

a=[1 2 3 4; 
 5 6 7 8;
 9 10 11 12;
 13 14 15 16]
n=size(a,2);
n2=n/2;
a1=a(:,n2+1:n);
a2=a(:,1:n2);
a1(2:2:end,:)=fliplr(a1(2:2:end,:))
a2(2:2:end,:)=fliplr(a2(2:2:end,:))
a2=flipud(a2)
out=reshape([a1' a2'],n,[])'

[Raza Ali]

what should be done to reverse this process means what to do, to get "a" back

[1 2 3 4;

 5 6 7 8;

 9 10 11 12;

 13 14 15 16]

[Alina]

the opposite of above coding can be used to convert this matrix back to its initial position

Am i right?