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Crossover521  
#1 Posted : 4 years ago
Crossover521

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Joined: 11/13/2020(UTC)
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I want to use the variable period indicators available through the forum.dll.

I want the period to be determined by my definition of a trend.

So suppose I define a trend condition e.g. trend:= a > b;

First thing I need is the number of times a trend was initiated:

Code:
init:= cum(trend = 1 AND ref(trend,-1) = 0);

Next thing I need are the total number of days where there was a trend:

Code:
days:= cum(trend);

Finally, the average number of days for a trend:

Code:
avgtrend:= days / init;

The problem is that before the first time there is a trend in the chart, init = 0 and I get an error for division with zero and thus I cannot calculate the average number of days that a trend lasts.

Any ideas how to overcome this? In a regular programming language I could give init an initial value of 0.0000000001 but this is not possible in Metastock, or I don't know how to do it.

MS Support  
#2 Posted : 4 years ago
MS Support

Rank: Advanced Member

Groups: Moderators, Registered, Registered Users, Subscribers
Joined: 10/8/2010(UTC)
Posts: 1,960

Thanks: 92 times
Was thanked: 155 time(s) in 150 post(s)
Originally Posted by: Crossover521 Go to Quoted Post

I want to use the variable period indicators available through the forum.dll.

I want the period to be determined by my definition of a trend.

So suppose I define a trend condition e.g. trend:= a > b;

First thing I need is the number of times a trend was initiated:

Code:
init:= cum(trend = 1 AND ref(trend,-1) = 0);

Next thing I need are the total number of days where there was a trend:

Code:
days:= cum(trend);

Finally, the average number of days for a trend:

Code:
avgtrend:= days / init;

The problem is that before the first time there is a trend in the chart, init = 0 and I get an error for division with zero and thus I cannot calculate the average number of days that a trend lasts.

Any ideas how to overcome this? In a regular programming language I could give init an initial value of 0.0000000001 but this is not possible in Metastock, or I don't know how to do it.

Hello,

You should be able to combine with an IF statement for that last line, such as:

Code:
avgtrend:= days / if(init=0, 0.00001, init);

Crossover521  
#3 Posted : 4 years ago
Crossover521

Rank: Member

Groups: Registered, Registered Users, Subscribers
Joined: 11/13/2020(UTC)
Posts: 10

Was thanked: 3 time(s) in 3 post(s)

Can't believe it was that simple and I missed it. Thamk you !

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