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Hello all,
I've had Metastock for all of about 1 week now, and I need a primer on how to use the "cross" function. I've looked at the help files, and lots of formula's, but I don't understand the number references. I think if somone could build a quick formula for me and explain the references, it would go along way towards my knowledge growth.
How about this. Build a formula that signals when the Williams%R climbs through a -50 level. That will get me headed down the right path.
Thank you in advance,
j32driver
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Rank: Advanced Member
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J32
In Example 1 Cross() plots a TRUE when WillR(14) crosses from below to above -50.
{Example 1}
Cross(WillR(14),-50)
A Cross() function requires 2 bars of data to generate a result – a "before" bar and an "after" bar. Both parameters in a Cross() function can be variables, or one can be constant (for obvious reasons both can't be constants). It's important to remember that a cross occurs when the first parameter crosses from below the second parameter (before) to above it (after). To signal a cross in the reverse direction just change the first and second parameter.
In Example 2 Cross() plots a TRUE when WillR(14) crosses from above to below -50.
{Example 2}
Cross(-50,WillR(14))
Roy
MetaStock Tips & Tools
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Rank: Member
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Perfect! Thank you Roy. The use and reversal of the "data array 1, data array 2" in the help section is what I didn't understand. You explained it perfectly!
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Rank: Member
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Posts: 19
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Ok... one last question and I think I'll be set for a while. I want a signal to be generated when W%R decreases by a set amount... say 20 for example. I don't have any idea where to start for this one.
Thank you in advance!
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Rank: Advanced Member
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Was thanked: 57 time(s) in 54 post(s)
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J32
The following formula will return a TRUE when WillR(14) drops by more than 20 from one bar to the next. You didn't say over what time frame the change was to take place so I've assumed 1 bar only for these first two examples.
WR:=WillR(14);
WR-Ref(WR,-1) < -20;
Or you could write it this way.
WR:=WillR(14);
Ref(WR,-1)-WR > 20;
Here's how you could signal a drop of more than 20 occurring over a maximum of 2 bars.
WR:=WillR(14); WR;
Ref(HHV(WR,2),-1)-WR > 20
Roy
MetaStock Tips & Tools
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Rank: Member
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Joined: 6/29/2007(UTC)
Posts: 19
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Been awhile since I've dropped in. Just wanted to say a quick thank you to Roy for the help. It is greatly appreciated!
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