up2 - up sampling by factor of 2
This function up samples the input vector by factor of 2. The output length would be twice the input vector. Odd-indexed element would be zeros and even-indexed element would be the input value. And the input could be row vectors or column vectors. The output vector would be row vectors.
-->a=[1 2 3 4 5]; -->b=up2(a) ans = 0 1 0 2 0 3 0 4 0 5 -->a=a'; -->b=up2(a) ans = 0 1 0 2 0 3 0 4 0 5 -->a=[1 2 3;4 5 6]; -->b=up2(a) Input should be vectors rather than matrixes! -->a=1; -->b=up2(a) ans = 0 1