[EquisMetaStock Group] Alternative IF function ??

[Tony M <t4tonym@xxxxxxxxx>]

Dear Metastock colleagues,

The "IF" function is widely used, but for many applications, the way this function is implemented in Metastock is not completely satisfactory. As we know, the structure is typically (for example):  IF (A > B, C, D) meaning "If condition A>B is true, then output C, otherwise output D". Consequently, if A and B are both fully defined at all times, and A is >B, then we get output C. What we (or at least I) expect is that, if A is not > B, then we should ALWAYS get output D. However this is not the case. In situations where A<=B it works fine, but in situations where it isn't true that A>B with reason being that either A or B is not defined, then we do not succeed in getting the  hoped-for output D.  I would like to find a remedy for this type of situation.

As an example, with code "If(C>Mov(C,100,E),C,-1)", I would like to get output -1
if the condition C>Mov(C,100,E) is not satisfied either because of a situation where C is <= Mov(C,100,E), or alternatively when Mov(C,100,E) is not defined. I have tried implementing this using a combination of the "IF" and the
"ISDEFINED" & "ISUNDEFINED" Metastock functions, but I have not succeeded in getting
it to work. It is easy to code the logic for this in a programming language such as Visual Basic, and so I would also like to implement this in Metastock using the MDK, but I am still new to the MDK and struggling with understanding the correct way of specifying the required arrays in the Metastock MDK.

Has anyone successfully implemented this useful alternative form of the IF function in  Metastock, either by:
a) using a combination of the standadrd Metastock internal functions ?, or
b) using the MDK to write a DLL to include into Metastock as an external function ? 

Hoping for help / ideas....
best regards,
Tony



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