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Martin -
Excellent idea. I love it. I will be sure to try it out when I get a chance.
Thanks.
You mention in your example of previous that it bogs your machine down a
bunch. Would it help to move the previous value to a holding variable. Perhaps
the machine would not have to reconstruct the set of values for each iteration
of the statement. ex:
if(buy,hold:=1,
if(sell,0,hold:));
Does this make sense? Will that help performance for you?
Thanks again
Chris
I do have a couple of comments embedded in the text below.
In a message dated 9/15/98 8:49:30 AM Eastern Daylight Time,
mhaesler@xxxxxxxxxxxxxx writes:
> Hi ...
>
> "previous" provides the pervious value of a formula or variable.
>
> suppose you have a formula that gives you only a blip (to a true state ie
> value
> one)
>
> eg
> buy:=cross(c,mov(c,21,e));
> and
> sell:=cross(mov(c,21,e),c);
>
> these signals respectively will give a blip to a one when the close crosses
> to
> above the 21 day exponential moving average and subseqently when it drops
> below.
> ie they will switch to one for only one bar.
>
> If you wanted to convert these two blips into a "am long" and "am out"
> signal to
> use in the expert to colour being long as green, and being out as blue, you
> could
> convert the two blips into a square wave by using the following formula
>
> if(buy,1,
> if(sell,0,previous));
>
> ie if we have a buy blip switch to value one, if we have a sell blip switch
> to
> value zero otherwise hold the previous value. This would switch to one on
> the buy
> blip and then hold this value until we had a sell blip, at which time it
> would
> switch to zero and stay there until we had another buy blip.
>
> I have found the "previous" function invaluable when picking up and holding
> values
> to use in indicators and experts. eg you can use the valuewhen function to
> pick up
> the buy value on a buy blip and the sell value on a sell blip. But they
> appear
> only for an instant (one bar). The "previous" function holds the values so
> that
> you can subseqently deduct the buy value from the sell value to determine
> the
> profit.
>
> However, be warned that the "previous" function is very compute demanding
> and when
> used over a long set of data, your machine may appear to "stall"
>
> Regards ... Martin
>
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