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Thanks
Chuck,
<SPAN
class=640045920-07052003>
My
questions were aimed at developing my own functions and I think you answered my
questions. I will do some experimenting. If you decide to add array to the
function please share it so I can compare the syntax.
Regards,
Jayson
<FONT face=Tahoma
size=2>-----Original Message-----From: Chuck Rademacher
[mailto:chuck_rademacher@xxxxxxxxxx]Sent: Wednesday, May 07, 2003
4:42 PMTo: amibroker@xxxxxxxxxxxxxxxSubject: RE:
[amibroker] Example using functions in MathLib (for Jayson)
<FONT color=#0000ff face=Arial
size=2>
I'm
lost, Jayson, sorry.
<FONT color=#0000ff face=Arial
size=2>
Are
you interested in writing functions or using the functions I
uploaded?
<FONT color=#0000ff face=Arial
size=2>
To use
RSquared, you don't even have to look at it. I've documented the fact that
you only pass the number of bars and it returns the value of the
function.
<FONT color=#0000ff face=Arial
size=2>
If you
are asking me how to write a function, you can have as many "things" being
passed to the function as you want. As long as the AFL calling the
function and the function itself agree on how many parameters are being passed
and in what order, everything is peachy.
<FONT color=#0000ff face=Arial
size=2>
I
could have written the function like this:
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>function crLinearCorrelation (crArray, crLength);
<FONT color=#0000ff face=Arial
size=2>
I may,
in fact, change it to that form in case someone wants to use the function on
something other than the closing price. If I wrote it that way, then
the AFL calling it has to pass two, corresponding parameters to
it.
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>Finally, you can return only one value and that is achieved with the
"return" statement as you have noted below.
<FONT color=#0000ff face=Arial
size=2>
I'm
happy to help, but I'm not sure whether you are seeking assistance with
using my functions or writing your own. If you want help with
writing one, just make an attempt at it and send it to me for
comment. You'll get comments and assistance from others,
too.
<BLOCKQUOTE
>
<FONT face="Times New Roman"
size=2>-----Original Message-----From: Jayson
[mailto:jcasavant@xxxxxxxxxxxx]Sent: Wednesday, May 07, 2003 4:22
PMTo: amibroker@xxxxxxxxxxxxxxxSubject: RE: [amibroker]
Example using functions in MathLib (for Jayson)
<SPAN
class=611563119-07052003>Thanks Chuck,
<SPAN
class=611563119-07052003>
<SPAN
class=611563119-07052003>Forgive me the rudimentary questions and please
correct me if I am wrong. First you declare the function with
<FONT
face=Arial>
function crLinearCorrelation (crLength)
then
you make your calculations with in the { } and you base the
results of the function with your IIf statement and the result of the
calculations you call with..<SPAN
class=611563119-07052003>
return <FONT
color=#0000ff>IIf(crLowEQT == <FONT
color=#ff00ff>0, <FONT
color=#ff00ff>0, crUpEQ / crLowEQT);
Is it always assumed
that following the function name (crLinearCorrelation ) that the next
argument is a period
(crlength)??
Regards,
Jayson
<FONT face=Tahoma
size=2>-----Original Message-----From: Chuck Rademacher
[mailto:chuck_rademacher@xxxxxxxxxx]Sent: Wednesday, May 07, 2003
3:22 PMTo: amibroker@xxxxxxxxxxxxxxxSubject: [amibroker]
Example using functions in MathLib (for Jayson)
<FONT color=#0000ff face=Arial
size=2>Jayson...
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>Perhaps you missed another posting on the subject.
<FONT color=#0000ff face=Arial
size=2>
Here
is an example using R-Squared that you might have in a trading
system:
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>#INCLUDE
"........................./crMathLib.afl";
<FONT color=#0000ff face=Arial
size=2>..
Buy
= LinRegSlope > 0 and crRSquared(20) > 0.80;
Sell
= LinRegSlope < 0 and crRSquared(20) > 0.80;
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>
or,
you might just want to graph R-Squared:
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>graph(0) = crRSquared(20);
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>
<FONT color=#0000ff face=Arial
size=2>
<BLOCKQUOTE
>
<FONT face="Times New Roman"
size=2>-----Original Message-----From: Jayson
[mailto:jcasavant@xxxxxxxxxxxx]Sent: Wednesday, May 07, 2003 9:01
AMTo: amibroker@xxxxxxxxxxxxxxxSubject: RE:
[amibroker] New math functions added to AFL library
(AmiBroker.com)
<SPAN
class=666545812-07052003>Chuck,
<SPAN
class=666545812-07052003>Thanks for sharing this. Could perhaps post an
example afl showing the use of one or both?
Regards,
Jayson
<FONT face=Tahoma
size=2>-----Original Message-----From: Chuck Rademacher
[mailto:chuck_rademacher@xxxxxxxxxx]Sent: Tuesday, May 06, 2003
3:57 PMTo: amibroker@xxxxxxxxxxxxxxxSubject:
[amibroker] New math functions added to AFL library
(AmiBroker.com)
<FONT color=#0000ff face=Arial
size=2>I've just uploaded a (very) small library of math functions to the
AFL library at AmiBroker.com. It is a "work in progress"
library and this first posting is purely to get things going.
More functions will be added regularly. Users may cut and paste
functions into their own code. The name of the file is crMathLib.afl
and the current version only includes:
<FONT color=#0000ff face=Arial
size=2>crLinearCorrelation (bars)
<FONT color=#0000ff face=Arial
size=2>crRSquare (bars)Send BUG REPORTS to
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Send BUG REPORTS to bugs@xxxxxxxxxxxxx
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