Question About the AFL

[chaser2009]

Hello,

The following AFL I got it from somewhere else, I want to convert to TOS, but I don't know what is the "1" mean in "BBandTop(C,20,0.5),1" and what are the "0" and "-1" mean in "BBandTop(C,20,0.5),0,-1".

Can someone explain to me or convert to TOS?

Thank you very much!

_SECTION_BEGIN("");
tf= IIf(C > BBandTop(C,20,0.5),1, IIf(C<BBandTop(C,20,0.5) AND C>BBandBot(C,20,0.5),0,-1))*10;

td=(tf+100)/2;
Colortf=IIf(td>50,colorBlue,IIf(td<50,colorRed,colorgreen));

Plot(td,"Trend",colortf ,styleDots);
_SECTION_END();

[portfoliobuilder]

@chaser2009 you've been using AmiBroker for many years so perhaps you should become familiar with the functions and how to properly post code on the forum using code tags.

User guide reference for immediate IF

AFL Function Reference - IIF

More discussion on this forum,

IIf function versus if statement

As mentioned by @fxshrat in ValueWhen - how to use a typical mistake users make is that they mix up if statement with IIf() function. IIf() (which stands for "immediate if") is a function, which means it takes arguments and returns the result result = IIf( condition, YesValue, NoValue ); It works with both numbers (scalars) and arrays. When any of arguments is an array it returns array. It goes bar by bar, checks condition again bar by bar and returns either corresponding array value from Yes…

So the code within the nested immediate IF's will return a 1 or a 0 (zero) or a -1 depending upon the position of the Close and the Bollinger Bands. Then it multiplies by 10.

tf= IIf(C > BBandTop(C,20,0.5), 1, IIf(C<BBandTop(C,20,0.5) AND C>BBandBot(C,20,0.5),0,-1))*10;