Is this code(in mat lab function block) correct for the attached logic?

[~,k2]=sort(g,'ascend');

[~,k1]=sort(h,'ascend');

k3=k1+k2;

k=k3/2;

[~,fx_opt]=min(k);

[Asvin Kumar]

Looks good.

Please note that MATLAB uses 1-based indexing while you require 0-based indexing. However, this won't affect the output of fx_opt because all values are off-shifted by 1.