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Seed,
I used the "If" argument as you described, but still got the same error
("This variable or expression must contain only constant data"), so that
appears to be a dead end.
Your 2nd suggestion is interesting; however, since I am not a computer
scientist/programmer, I don't know how to create a DLL. Do you know if
anyone has created a variable-length DLL, or where it might be available (is
there a repository for Metastock DLLs that you are aware of?)?
Shashi
------------------------------
Date: Mon, 28 Jan 2002 21:37:45 +0000
From: "j seed" <jseed_10@xxxxxxxxxxx>
Subject: Re: Variable period channel - need help with formula
Shashi,
Welcome to the "Metastock Coding Nightmare World"!
Metastock will not allow variables that are dynamic in the way that you have
described..."thus, when ADX is high, the channel length will be short & vice
versa".
The work arounds would be:
1. Use "If" statements to define the value of the channel length at various
ADX levels.
2. Use a variable length DLL. These are not widely available but do exist.
Let us know how it turns out.
J.
>From: Shashi Aggarwal <shashiag@xxxxxxxxxx>
>Reply-To: metastock@xxxxxxxxxxxxx
>To: "Metastock Digest (E-mail)" <metastock@xxxxxxxxxxxxxxxxxx>
>Subject: Variable period channel - need help with formula
>Date: Sun, 27 Jan 2002 12:58:13 -0600
>
>I was trying to create a variable-period channel indicator, as follows:
>
>Days:= Round(150/ADX(14));
>HHV(H,Days);
>LLV(L,Days);
>
>[Note: The round function is merely to round up or round down the resulting
>fraction to the nearest integer].
>
>However, I get this error message: "This variable or expression must
>contain
>only constant data" (referring to the variable 'Days' in the HHV & LLV
>arguments). [Note: the error message is also there when I substitute
>PriceChannelHigh(Days) for HHV(H,Days) and PriceChannelLow(Days) for
>LLV(L,Days)].
>
>One workaround I came up with is to modify the Days argument, as follows:
>
>Days:= LastValue(Round(150/ADX(14)));
>HHV(H,Days);
>LLV(L,Days);
>
>However, while this makes the error message go away, it results in a price
>channel that is based on the last value of 150/ADX(14) and this is constant
>across the entire chart. This, of course, defeats the purpose of the
>indicator as I want the channel length to vary with the 14-day ADX across
>the entire chart - thus, when ADX is high, the channel length will be short
>& vice versa.
>
>Can anyone suggest a solution? Thanks.
>
>Shashi
>
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