PREV - Previous value of the same formula

This function is an alternative to the "PREV" function of Metastock.

In Metastock, the "PREV" function is a constant used to reference the previous value of the same formula.

For example, if you want to calculate this:

a = close + [Previous Value of this Formula];

In Metastock, you can use:

a = close + PREV;

This formula takes the value of "close" and adds it to the previous value of "a".
At bar "100", it takes the close price at that bar and adds it to the value of variable "a" at bar 99.

The problem with the "PREV" function of Metastock is that it slows down processing dramatically. This is not the case with the QuantShare similar "PREV" function.

This function allows you to create formulas like:
c = a + b * PREV;

Let us translate an example:

Metastock: (This calculates a sort of exponential moving average)
res = (close*0.20)+(PREV*0.80);

QuantShare:
res = PREV(close*0.20, 0.80);

The first argument is "a" and the second one is "b", which results into: close*0.2 + 0.8*PREV

Here is another example:

Metastock:
res = close + PREV;

QuantShare:
res = PREV(close, 1);

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