How can I support append calculations?

[zhixiongdu027]

For instance, given the existing data stream:

{81.59, 81.06, 82.87, 83.00, 83.61, 83.15, 82.84, 83.99, 84.55};

I calculated the MACD (Moving Average Convergence Divergence) values to be:

{0.618,0.351,0.111,0.416,0.578}
{0.618,0.564,0.474,0.462,0.485}
{0.000,-0.213,-0.363,-0.046,0.093}

Then, I appended two data point to the queue: {84.36,85.53}.

The expected result was:

{0.618,0.351,0.111,0.416,0.578 ,              0.422,0.684   }
{0.618,0.564,0.474,0.462,0.485,                0.473,0.515  }
{0.000,-0.213,-0.363,-0.046,0.093,             -0.050,0.169  }

However, the actual calculation did not yield these results.
Could someone please help me understand what might be going wrong?

@yageek @codeplea @cschanaj

[codeplea]

Without seeing your code, its impossible to know where you're going wrong.