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Choppy Market Index

  • #1
  • First Post: Feb 9, 2009 12:24am Feb 9, 2009 12:24am
Can anyone please help me with converting the following Tradestation code to MT4:

Inserted Code
{Choppy Market Index Function
This function returns a value from 0 to 100.
A lower value denotes higher market indecisiveness (choppiness),
whereas a higher value denotes a trending market.
The only input is the number of bars that we look back.}

Inputs: periodLength(Numeric);
Vars: num(0),denom(1);
if(periodLength<>0) then
begin
       denom = Highest(High,periodLength) – Lowest(Low,periodLength);
       num = Close[periodLength-1] – Close;
       num = AbsValue(num);
       ChoppyMarketIndex = 0.0;
       if(denom<>0) then ChoppyMarketIndex = num/demon*100;
end;
Did you notice how this function was made up of other functions (building blocks)? We calculated the denom (denominator) by using the Highest and Lowest functions. We calculated the num (numerator) by using AbsValue (returns the absolute value of a number) functions. The only confusing snippet of code in this function is probably:

Inserted Code
Close[periodLength-1] – Close
You may be asking why we subtracted 1 from the periodLength. This is a great question. If you incorporate today’s closing price into a calculation, then the closing price 30 days ago would be referenced by Close[29]. Remember that Close[1] is yesterday’s closing price not today’s. Since we want our index to flow between 0 and positive 100, we remove the negative sign of a down move in the market. We are only interested in absolute distances.

Here is what I came up with, but not sure it is coded correctly:

Inserted Code
double ChoppyMarketIndex(int periodLength)
   {
   double num = 0;
   double denom = 0;
   if(periodLength != 0)
      {
      denom = High[iHighest(Symbol(),PERIOD_D1,MODE_HIGH,periodLength,0)] - Low[iLowest(Symbol(),PERIOD_D1,MODE_LOW,periodLength,0)];
      num = Close[periodLength-1] - Close[1];
      num = MathAbs(num);
      }
      if(denom != 0)
         {
         return(NormalizeDouble(num/denom*100,0));
         }
   }
Thanks in advance,

TimeFreedom
  • #2
  • Feb 10, 2009 1:42pm Feb 10, 2009 1:42pm
bump

Can anyone help to verify that the MT4 code is correct?

TimeFreedom
  • #3
  • Feb 10, 2009 2:32pm Feb 10, 2009 2:32pm
hi

ithink you will find the indicator programmed from mladen on forex-tsd

reagards
  • #4
  • May 21, 2009 5:52pm May 21, 2009 5:52pm
try to ask for advice from hanover. he is very helpful & cordial, & a great programmer too. try also oksana17, thatwasme or magnumfreak. they are all excellent programmers.
  • #5
  • May 22, 2009 1:33am May 22, 2009 1:33am
Quoting TimeFreedom
Can anyone please help me with converting the following Tradestation code to MT4:

Inserted Code
double ChoppyMarketIndex(int periodLength)
   {
   double num = 0;
   double denom = 0;
   if(periodLength != 0)
      {
      denom = High[iHighest(Symbol(),PERIOD_D1,MODE_HIGH,periodLength,0)] - Low[iLowest(Symbol(),PERIOD_D1,MODE_LOW,periodLength,0)];
It's worth checking GetLastError() value at this point. If you call the function from a timeframe different from PERIOD_D1 it can return zero while the data is downloading. There is an example in ArrayCopySeries() documentation.
Quote
Inserted Code
      num = Close[periodLength-1] - Close[1];
Close in EL corresponds to Close[0] in MT platform. So the expression above is ported not quite exactly.
Quote
Inserted Code
      num = MathAbs(num);
      }
      if(denom != 0)
         {
         return(NormalizeDouble(num/denom*100,0));         }
   }
If you want to receive an integer value it would make better sense if you declare integer function
int ChoppyMarketIndex(int periodLength)
instead of double and replace the return string with
Inserted Code
         return (num / denom * 100. + 0.5);
BTW, the function doesn't necessary returns values up to 100. Nothing limits it from a higher result.
Besides there must be a typo in the initial code. demon variable is unexpected in the return statement.
  • #6
  • May 22, 2009 3:12am May 22, 2009 3:12am
here you go:
http://i44.tinypic.com/rw46eg.gif
  • #7
  • May 22, 2009 3:16am May 22, 2009 3:16am
like this?
http://www.jetScreenshot.com/demo/20090522-56c-27kb.jpg
  • #8
  • Last Post: Nov 2, 2011 1:30am Nov 2, 2011 1:30am
Hey LUKX,

That screenshot of the CMI indicator that you posted May 22, 2009: Any idea where I could find that? Have searched this & other sites with no luck. Any help most sincerely appreciated.

Cheers
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