make function to shift discrete signal

hello I am currently studying DSP and using matlab . I build a function that shifting signals and the out put of this function is n and y for exmaple :

x=[ 2 3 0 -5 2 1 ]; n=-1:4;

and i want that y(n)=x(2-K)

and this is my code :

clc;
clear all;

x=[  2 3 0 -5 2 1  ];
n=-1:4;
m=2;

k=-1
shifting_by_m (x,m,n,k)

stem(n,x)

and the function is :

function [n,x] =shifting_by_k (x,m,n,k)

if (k<0)
        n=m+flip(-n) %%h(m-k)
        x=flip(x)

else (k>0)

          n=(-1)*(m-n)
          x=x

      end

end

the question is there a way to write in my main code '(2-k)' and that the function will get that m=2 and k<0 ?

[Adam]

If your function only supports a scalar k then why don't you just pass in 2-k as that argument? Where k is whatever you want it to be in your original equation and within the function it is just the single shift - i.e. whatever you pass it, which would be the result of 2-k

[tomer polsky]

I am sorry but i did not understand what do you mean

[Adam]

Why are you trying to pass '2-k' into a function? Just calculate 2-k and pass the result of that into the function as the desired shift.