With MATLAB, find is built-in! function arr=add1(arr,val,n) if n==0 ind=find(arr==val); elseif n>0 ind=find(arr==val,n); else ind=fin

With MATLAB, find is built-in! function arr=add1(arr,val,n) if n==0 ind=find(arr==val); elseif n>0 ind=find(arr==val,n); else ind=find(arr==val,-n,'last'); end arr(ind)=arr(ind)+1;