Re: [amibroker] general question on loops and arrays.

[Keith McCombs <kmccombs@xxxxxxxxxxxx>]

Maybe this little example will help:

Assume we want an array B equal to an array A shifted to the right one bar:
   B = Ref(A, -1);
AB calculates the result by doing something like:
   for(i=1; i<BarCount; i++) B[i]= A[i-1];
or:
   for(i=BarCount-1; i>0; i--) B[i]= A[i-1];

However, if we try to shift an array A right by one bar using:
   A = Ref(A, -1);
and AB calculates the result by doing something like:
   for(i=1; i<BarCount; i++) A[i]= A[i-1];
the result is that all a[i] are set equal to a[0], not what we wanted.

AB could have calculated our desired result with something like:
   for(i=BarCount-1; i>0; i--) A[i]= A[i-1];
But AB is just a computer program.  It can't know our desires, unless we tell it, in its own language.

-- Keith


Noah Bender wrote:

Here is a general question for someone like me who has had amibroker for a few months.

 

I am trying to really get to the bottom of difference between array proccessing and loop processing. I see my code incorporates both of them and I think there may be some problems because I am not entirely sure of the difference between them. So hopefully one of the gurus will be kind enough to really list the differences. i found the userguide to only give a cursory explanation.

 

thanks in advance

noah

 

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