missing buy/sell variable assignments

brijwanth · #1 13th November 2006, 07:59 PM

missing buy/sell variable assignments

could someone help me I have written some basic codes

Code:

x="ref(close,0)";
for(i=1;i<5;i++)
  {
   "ref(close,-i)">x;
   x="ref(close,-i)";
  }
buy=x; 
sell=0;

this code is to buy of the closing price is decreasing from past 5 days

Pls. don't joke for this light code but this is first afl code

Also I have a small doubt whether we have to start with main() like in c or are their any rules like main in c etc

THANX IN ADVANCE

bvpraveen · #2 13th November 2006, 09:12 PM

Quote:

Originally Posted by brijwanth

missing buy/sell variable assignments

could someone help me I have written some basic codes

Code:

x="ref(close,0)";
for(i=1;i<5;i++)
  {
   "ref(close,-i)">x;
   x="ref(close,-i)";
  }
buy=x; 
sell=0;

this code is to buy of the closing price is decreasing from past 5 days

Pls. don't joke for this light code but this is first afl code

Also I have a small doubt whether we have to start with main() like in c or are their any rules like main in c etc

THANX IN ADVANCE

Hello Friend,

Please find the attached AFL which does your job exactly. It will display green buy arrow at the 5th bar. It can be used for any periods for lookback, ie 5 in your case. Let me know if anything is wrong or I've misunderstood your requirements.

If you want to either just change your code or need to use only Ref(), let me know. I will try it tomorrow.

No, we dont' need any C like main(). The AFL is executed from the first line.

Hope this helps,
Praveen.

brijwanth · #3 15th November 2006, 03:13 PM

thanx but it gives
error 29
[code]
lowerCloseForming = True;

}
shape = Buy *
------------^
Error 29.
Variable 'buy' used without having been initialized.

}

/CODE]

Also I am studying Engg. II Yr so I have learnt c as one of my subject so I wanted to make simple easy to read code what are variables to initialise today's close and yesterday's close I din't want to chart but simply put in automatic analysis
one of the basic rules of trading is : KISS (KEEP IT SIMPLE, SIR !!!)
Thanx for ur reply

bvpraveen · #4 15th November 2006, 04:37 PM

Quote:

but it gives error 29
[code]
lowerCloseForming = True;

}
shape = Buy *
------------^
Error 29.
Variable 'buy' used without having been initialized.

}

I think this error would have occurred for those scripts that had less than 4 bars. Hence it might not have went into the 'for' loop. If its not the case, then please let me know. Better you initialize the buy variable to false in the beginning. ie insert this statement -- "Buy = false;" before the 'for' loop. That will solve this error.

Quote:

Also I am studying Engg. II Yr so I have learnt c as one of my subject so I wanted to make simple easy to read code

Friend, I too learnt C during my first year.

Quote:

what are variables to initialise today's close and yesterday's close I din't want to chart but simply put in automatic analysis

I couldn't get you, yar.

Today close -- Close[barCount]
Yesterday's close -- Close[barCount - 1]

If you are referring to any other question, please explain it clearly. I will try to answer.

Quote:

one of the basic rules of trading is : KISS (KEEP IT SIMPLE, SIR !!!)

Believe me, the AFL which I had given is not complex. Its simple only. I'd used some simple control statements. Thats it.

As usual, if I'd wrong anywhere, please let me know.

Hope this helps,
Praveen.

brijwanth · #5 17th November 2006, 05:17 PM

I meant to know the stocks which gave lost 10% in the past 5 days.

I want to put that program in automatic Analysis of Amibroker

issing buy/sell variable assignments this error repeats if i backtest and runs fine if i press scan

bvpraveen · #6 17th November 2006, 06:09 PM

Quote:

Originally Posted by brijwanth

I meant to know the stocks which gave lost 10% in the past 5 days.

I want to put that program in automatic Analysis of Amibroker

issing buy/sell variable assignments this error repeats if i backtest and runs fine if i press scan

Hi,

For backtest, you need to specify when to buy and sell using 'Buy' and 'Sell' variables. Backtest wont work without these two variables.

The smallest AFL for backtest can be something like:

Quote:

Buy = Cross(MA(Close, 3), MA(Close, 13));
Sell = Cross(MA(Close, 13), MA(Close, 3));

In your case 'Buy' will be:

Quote:

Buy = C <= Ref(C, -5) * 0.9;

Define the condition for 'Sell' and then run Backtest. It should run now.

Praveen.

brijwanth · #7 18th November 2006, 03:20 PM

thanx praveen

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