The difference between these two expression

[wolfcuring]

In practicing coding, I happened to use some code like this:

             protected override void OnBarUpdate()
             {
              int  flip, previous_flip;
 
              if (Input[0]>SMA(10)[0])   flip=1;
              if (Input[0]<SMA(10)[0])   flip=-1;

              if (flip==1&& previous_flip!=flip)  EnterLong();
           
              previous_flip=flip; 
             }

but the above code does not seem to function properly, and triggers a buy signal on every bar when the flip happens, while I change the code to the following expression, then it operates quite well

             protected override void OnBarUpdate()
            {
              int  flip, previous_flip;
 
              if (Input[0]>SMA(10)[0])   flip=1;
              if (Input[0]<SMA(10)[0])   flip=-1;

              if (flip==1)
                 { 
                        if (previous_flip!=flip)  EnterLong();
                 }
           
              previous_flip=flip; 
             }

the logic between the two seems to be the same, why the former one is wrong ?

[NinjaTrader_Brett]

Hello,

Thanks for the forum post.

I reviewed the code and came to the same conclusion as you did, I would expect both code snips to run largely the same.

At this point I suspect some other change may have caused the difference.

In either regaurd what I would hve to do is add in Print() statements to me code to understand what is an is not running and what the variables states are so that I could figure out what is going on.

Please use this information below to help you with doing this.

http://www.ninjatrader.com/support/forum/showthread.php?t=3418

I would also add in TraceOrders so you can understand what is going on here as well.

http://www.ninjatrader.com/support/forum/showthread.php?t=3627

Let me know if you need further assistance once this is added in.

[wolfcuring]

Thank you Brett, I would try it.