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Question About the "For Loop"

  • #1
  • First Post: Feb 25, 2009 11:11pm Feb 25, 2009 11:11pm
Hi,

Question About the "For Loop".

When does one use "for (i=0;i<limit;i++)" and not "for (i=limit;i>0;i--)" or vica versa? In other words, when one has to count from 1 to 10 or the opposite?

Regards.
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  • #2
  • Feb 25, 2009 11:36pm Feb 25, 2009 11:36pm
There's no strict rule against it if that's what you're asking. It depends on the application.

Example:

 

  1. When cycling through objects, better to count down than up.
  2. When scanning backwards through the chart history, better to count up than to count down.

  • #3
  • Feb 25, 2009 11:44pm Feb 25, 2009 11:44pm
an incremental counter (i++) should never be used for drawing an indicator on the charts. This results in the indicator drawing from right to left instead of left to right as it should be.


incremental counters are usually used for stepping though arrays.
  • #4
  • Feb 25, 2009 11:47pm Feb 25, 2009 11:47pm
Thanks for your repllies.

How about when:

 

  1. Counting open trades
  2. Modifying trades
  3. Closing Trades
  4. Deleting trades

Which route shall I choose?

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  • #5
  • Feb 25, 2009 11:54pm Feb 25, 2009 11:54pm
Quoting unaizams
Thanks for your repllies.

How about when:

 

  1. Counting open trades
  2. Modifying trades
  3. Closing Trades
  4. Deleting trades

Which route shall I choose?

Opentrades use the OrdersTotal function to get all orders or if you are counting for a particular pair use an incremental counter
modifying incremental
Closing trades if you are closing all trades you can use a while loop and loop it while orderstotal >0 For closing all orders for a certain pair you will need to use an incremental counter BUT each time you close an order you need to reset the counter back to the beginning. This is because of how orders are indexed when you use the orderselect function
  • #6
  • Feb 26, 2009 12:00am Feb 26, 2009 12:00am
++
  • #7
  • Feb 26, 2009 12:04am Feb 26, 2009 12:04am
Quoting magnumfreak
Opentrades use the OrdersTotal function to get all orders or if you are counting for a particular pair use an incremental counter
modifying incremental
Closing trades if you are closing all trades you can use a while loop and loop it while orderstotal >0 For closing all orders for a certain pair you will need to use an incremental counter BUT each time you close an order you need to reset the counter back to the beginning. This is because of how orders are indexed when you use the orderselect function
Thank you all for replying.

When you say "use an incremental counter" do you mean the "for loop" counter which ends in (i++)? If this is the case, what is the technical name for the opposite counter which ends in (i--)?
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  • #8
  • Feb 26, 2009 12:26am Feb 26, 2009 12:26am
Quoting unaizams
Thank you all for replying.

When you say "use an incremental counter" do you mean the "for loop" counter which ends in (i++)? If this is the case, what is the technical name for the opposite counter which ends in (i--)?
yes, i++ is an incremental counter, i-- is a decremental counter
  • #9
  • Mar 1, 2009 12:20pm Mar 1, 2009 12:20pm
Quoting unaizams
Hi,

Question About the "For Loop".

When does one use "for (i=0;i<limit;i++)" and not "for (i=limit;i>0;i--)" or vica versa? In other words, when one has to count from 1 to 10 or the opposite?

Regards.
something to point out. those 2 statements, although both loops through "limit" number of times. They're not going to work the same way if you're looping through arrays.

e.g.

assuming limit=10

for (i=0;i<limit;i++)
{
Print (i); // this gives you 0 1 2 3 4 5 6 7 8 9
}

for (i=limit;i>0;i--)
{
Print (i); // this gives you 10 9 8 7 6 5 4 3 2 1
}

not an exact opposite countdown isn't it?

to countdown from 9 to 0, we would use

for (i=limit-1; i>=0; i--)
{
Print (i); // this gives you 9 8 7 6 5 4 3 2 1 0
}
Programming for a better future.
  • #10
  • Mar 1, 2009 12:26pm Mar 1, 2009 12:26pm
Quoting unaizams
Thanks for your repllies.

How about when:

  1. Counting open trades
  2. Modifying trades
  3. Closing Trades
  4. Deleting trades

Which route shall I choose?

Counting open trades - Incremental / Decremental
Modifying trades - Incremental / Decremental
Closing Trades - Decremental only
Deleting trades - Decremental only
Programming for a better future.
  • #11
  • Mar 1, 2009 12:27pm Mar 1, 2009 12:27pm
Quoting magnumfreak
Closing trades if you are closing all trades you can use a while loop and loop it while orderstotal >0 For closing all orders for a certain pair you will need to use an incremental counter BUT each time you close an order you need to reset the counter back to the beginning. This is because of how orders are indexed when you use the orderselect function
you won't have that problem if you use a decremental for or while loop.
Programming for a better future.
  • #12
  • Last Post: Mar 1, 2009 12:30pm Mar 1, 2009 12:30pm
Thanks for your valuble input.
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