MATLAB: Elimination of the chosen elements and rearranging the matrix

eliminate re-arrange

a=[1 2 3 4 5 6 7 8 nan nan nan nan nan];
for i=1:length(a)
   b(i)=a(i)+1;
   if b(i)< 4 
       b(i)=[];
   elseif b(i)>6
       b(i)=[];
   end
      
end
it gives ans:
a =
1 2 3 4 5 6 7 8 NaN NaN NaN NaN NaN
>> b
b =
0 0 4 5 6 0 0 0 NaN NaN NaN NaN NaN
well, i want to eliminate the elements instead of replacing it by zeros as:
4 5 6 nan nan nan nan nan nan nan nan nan nan

Best Answer

Deleting elements of an array while you iterate over elements of an array is never going to work.
In any case, a loop is not needed for what you're doing:
a=[1 2 3 4 5 6 7 8 nan nan nan nan nan];
b = a + 1
b(b < 4 | b > 6) = [];
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