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Don't know whether this is helpful in clarifying it, but I'll give it
a try:
Say I have an AFL which looks like this:
bla bla bla . . . . .
examplevar=C/2; // This examplevar is now defined and thus already by
definition a global variable !
bla bla bla . . . .
function Trial()
{
global examplevar; // Here I define examplevar again, but now as a
global variable within the function; this will cause a problem as
we'll see
. . . .
anotherexamplevar=H/2;
examplevar=C/3;
return anotherexamplevar;
}
. . . .
CallTrial = Trial();
CallExampleVar=examplevar;// This returns the value of the very first
definition of examplevar, thus the one before = outside the function.
It is therefore NOT equal to the "examplevar" defined as a global
variable within the function. In fact, there is no way to catch this
latter value, unless you change the code/names/etc.
This is my understanding and how I use it.
PS
--- In amibroker@xxxxxxxxxxxxxxx, "Ara Kaloustian" <ara1@xxxx> wrote:
>
> Exactly ... That's how I use it ... but it is not working reliably
>
> Ara
> ----- Original Message -----
> From: "Graham" <kavemanperth@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Wednesday, November 02, 2005 6:26 PM
> Subject: Re: [amibroker] Re: Global variables
>
>
> > If I want to use a variable that is defined within a function or
> > procedure I first define it as a globla variable within the
function
> > or procedure. it is then available within the AFL after that
function
> > or procedure has been called
> >
> > On 11/3/05, Chuck <cstangor232@xxxx> wrote:
> > > According to the help manual, this is how global and local
variables
> relate
> > > to functions (depends on where they are first defined):
> > >
> > > If given identifier appears first INSIDE function definition -
then it
> is
> > > treated as LOCAL variable.
> > > If given identifier appears first OUTSIDE function definition -
then it
> is
> > > treated as GLOBAL variable.
> > >
> > >
> > > ----- Original Message -----
> > > From: "Ara Kaloustian" <ara1@xxxx>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Wednesday, November 02, 2005 12:12 PM
> > > Subject: Re: [amibroker] Re: Global variables
> > >
> > >
> > > > Barry
> > > >
> > > > this is getting confusing ...
> > > >
> > > > Globals defined as such within a function seem available
globally ...
> but
> > > > as
> > > > I indicated earlier... not reliably.
> > > >
> > > > According to the help files, there is no distinction between
globals
> > > > defined
> > > > within functions and variables initialized outside of
functions.
> > > >
> > > > Where did you see the distinction you mentioned?
> > > >
> > > > Hope this thread resolves the "mystery" of globals.
> > > >
> > > >
> > > > Ara
> > > >
> > > > ----- Original Message -----
> > > > From: "Barry Scarborough" <razzbarry@xxxx>
> > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > Sent: Wednesday, November 02, 2005 8:54 AM
> > > > Subject: [amibroker] Re: Global variables
> > > >
> > > >
> > > >> Global variables defined withing a function are scoped to
that
> > > >> function and all the sub functions within that function. But
once
> > > >> you call outside that function the variable is not
available. If you
> > > >> want the variable to be global it has to be in a global
scope,
> > > >> outside of the functions that will use it. Declare it at the
top of
> > > >> your code and it will have global scope as you mentioned.
Otherwise
> > > >> pass it as a parameter. This is much safer. You have to be
careful
> > > >> when using globals because anyone can change a global
anytime and
> > > >> anywhere, darn hard to debug if that happens. If that is OK
then
> > > >> make it global.
> > > >>
> > > >> I would have to look at your code to see what you are doing.
> > > >>
> > > >> Barry
> > > >>
> > > >> --- In amibroker@xxxxxxxxxxxxxxx, "Ara Kaloustian"
<ara1@xxxx>
> > > >> wrote:
> > > >> >
> > > >> > I have had some problems with defining globals within a
function.
> > > >> >
> > > >> > Globals defined withing a function are not always
available to
> > > >> code later on. In one situation, a global defined within a
prior
> > > >> function and used in an indicator, was not available to some
copies
> > > >> of the indicator and was available to some others where the
> > > >> indicator was used multiple times in same instance, but on
different
> > > >> panes.
> > > >> >
> > > >> > If I initialize the variable at the beginning of the
program, it
> > > >> is automatically a global and always works reliably.
> > > >> >
> > > >> > Anyone with similar issues?
> > > >> >
> > > >> > Ara
> > > >> >
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> Please note that this group is for discussion between users
only.
> > > >>
> > > >> To get support from AmiBroker please send an e-mail directly
to
> > > >> SUPPORT {at} amibroker.com
> > > >>
> > > >> For other support material please check also:
> > > >> http://www.amibroker.com/support.html
> > > >>
> > > >>
> > > >> Yahoo! Groups Links
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > > >
> > > > Please note that this group is for discussion between users
only.
> > > >
> > > > To get support from AmiBroker please send an e-mail directly
to
> > > > SUPPORT {at} amibroker.com
> > > >
> > > > For other support material please check also:
> > > > http://www.amibroker.com/support.html
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > > Please note that this group is for discussion between users
only.
> > >
> > > To get support from AmiBroker please send an e-mail directly to
> > > SUPPORT {at} amibroker.com
> > >
> > > For other support material please check also:
> > > http://www.amibroker.com/support.html
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> > --
> > Cheers
> > Graham
> > AB-Write >< Professional AFL Writing Service
> > Yes, I write AFL code to your requirements
> > http://e-wire.net.au/~eb_kavan/ab_write.htm
> >
> >
> >
> > Please note that this group is for discussion between users only.
> >
> > To get support from AmiBroker please send an e-mail directly to
> > SUPPORT {at} amibroker.com
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
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