StockFetcher Forums · Filter Exchange · Learning BOOLEAN for SF ... link?<< >>Post Follow-up
karennma
6,447 posts
msg #127809
Ignore karennma
4/3/2016 11:52:16 AM

Question:
Didn't SF at one time have a link for their Boolean filters?
i.e.,

I don't know what "qq" means. I don't know what "rr" means ...
I don't know what "oo" + "rr" means. (WHY are they adding "oo" and "rr"?)
SET{C1, oo + rr}
SET{C2, C1 +qq}

What would be the difference between "r" vs. "rr" or "q" vs. "qq"?
SET{rr, COUNT(r between 0.99 and 1,1)}
SET{qq, COUNT(q between 0.99 and 1,1)}


set{o, ma(20)/close}
SET{oo, COUNT(o between 0.99 and 1,1)}
set{r, ma(50)/close}
SET{rr, COUNT(r between 0.99 and 1,1)}
set{q, ma(200)/close}
SET{qq, COUNT(q between 0.99 and 1,1)}

add column c2{times}
sort column 5 descending

add column oo{ma20}
add column rr{ma50}
SET{rr, COUNT(r between 0.99 and 1,1)}{ma200}
SET{C1, oo + rr}
SET{C2, C1 + qq}

Question:
Some one else had a Boolean filter that put "Buy", Sell", 'Wait" cubes at the bottom of their charts. I believe it was color-coded.
I have NO clue how to do it. I copied their filter a few months ago, but couldn't modify it because I don't know Boolean.

Anyone gotta link?
Thanks in advance.


four
3,456 posts
msg #127810
Ignore four
modified
4/3/2016 12:01:28 PM

http://lib.colostate.edu/tutorials/boolean.html

Short slide show on boolean logic...
To move to the next slide, tap the NEXT button it is located in the top-right corner.

From the slide show:

Available options: dog, cat, bird, fish

AND = BOTH (fur and barks = dog)
OR = EITHER or BOTH (feathers or scales = bird or fish)
NOT = ONE and NOT the other (lays eggs not in trees = fish)

HTH

------------

From TRO: He offers the boolean logic in StockFetcher format.

http://forums.stockfetcher.com/forums2/General-Discussion/A-COMPLETE-LOGIC-SYSTEM-ANOTHER-GIFT-FROM-AVERY/28017

Kevin_in_GA
4,039 posts
msg #127818
Ignore Kevin_in_GA
4/3/2016 5:58:14 PM

The basic idea is to create two (or more) user-defined variables - let's say your two conditions are that the close price must be above the 20 day moving average and the rsi(2) must be below 5.

Now this is a really simple one since we could just write two filter statements and not get fancy, but here is a way to construct the Boolean versions:

set{variable1, count(close above ma(20),1)}
set{variable2, count(rsi(2) below 5,1)}
set{Boolean_AND, variable1 * variable2} - this returns a value of 1 only if both conditions are true
set{Boolean_OR, variable1 + variable2} - this returns a value of 1 if either condition is true

As to the filter which color-coded options - it might have been this one from me a while back:
Fetcher[
set{pp_10, CMA(pp,10) 1 day ago}
set{r_10, CMA(r1,10) 1 day ago}
set{s_10, CMA(s1,10) 1 day ago}

set{BUY, count(close closes above pp_10,1)}
set{SELL, count(close closes below r_10,1)}
set{WAIT, BUY * SELL}


draw WAIT
draw SELL on plot WAIT
draw BUY on plot WAIT

draw pp_10 on plot price
draw r_10 on plot price
draw s_10 on plot price

symlist(spy,qqqq,dia,gld,iwm,slv)

add column BUY
add column SELL
add column pp_10
add column r_10
add column s_10
]



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