Hello, 0. Change the refresh interval to zero 1. Yes 2. Thats because of 3 second refresh interval you had, (see 0.)
Best regards, Tomasz Janeczko amibroker.com ----- Original Message ----- From: "ozzyapeman" <[email protected]> To: <[email protected]> Sent: Wednesday, March 18, 2009 12:16 AM Subject: [amibroker] Re: Testing for new bar using string manipulation and quotation time >I should add that I have Realtime chart refresh interval(sec) set to 3. > > > --- In [email protected], "ozzyapeman" <zoopf...@...> wrote: >> >> A couple of more questions, as I am still running into some issues: >> >> 1. In Tools --> Preferences --> Intraday, I used to have "time of last >> tick inside bar" checked off. I have now unchecked that >> and instead checked "START time of interval". Question is: will this >> retroactively correct all past bars in the database to >> reflect the new settings? Or will only new bars coming into the database >> reflect the new time stamp settings? >> >> >> 2. I have my System Time properly calibrated so that it matches Market Time >> in TWS to within a fraction of a second. Yet my AB >> chart sometimes shows a new bar starting within 2-5 seconds after HH:MM:00 >> Market Time, and yet other times it shows a new bar >> starting as late as 20-30 seconds after HH:MM:00 Market Time. It's a mixed >> bag, and alternates every now and then without >> apparent cause. And this affects trade timing as well. >> So how do I get the chart (and trades) to properly synch up with Market >> Time? What am I still missing? >> >> >> >> >> --- In [email protected], "ozzyapeman" <zoopfree@> wrote: >> > >> > Thanks for all the feedback, guys. It's been very helpful! >> > >> > >> > --- In [email protected], "Barry Scarborough" <razzbarry@> wrote: >> > > >> > > This is a little simpler than the similar approach I mentioned a few >> > > posts earlier. In my trading program I have an >> > > initialization function and I set the lastValue of timeNum in the static >> > > var to the current bar on the first pass through the >> > > code. That way NewBar will not be true on the first scan through the >> > > code and that prevents it from being true mid bar, which >> > > it will in the way Tomasz and I proposed. It will wait until the next >> > > bar after AB starts. That may or may not matter to you. >> > > >> > > Barry >> > > >> > > --- In [email protected], "Tomasz Janeczko" <groups@> wrote: >> > > > >> > > > There is much easier and reliable method: >> > > > >> > > > dt = LastValue( DateTime() ); >> > > > >> > > > if( StaticVarGet( "lastdt" ) != dt ) >> > > > { >> > > > _TRACE("New bar"); >> > > > StaticVarSet("lastdt", dt ); >> > > > } >> > > > >> > > > (Note that it works only if Tools->Preferences->Intraday is set >> > > > to show START or END time of interval). >> > > > >> > > > Best regards, >> > > > Tomasz Janeczko >> > > > amibroker.com >> > > > ----- Original Message ----- >> > > > From: "Yofa" <jtoth100@> >> > > > To: <[email protected]> >> > > > Sent: Tuesday, March 17, 2009 1:03 PM >> > > > Subject: Re: [amibroker] Re: Testing for new bar using string >> > > > manipulation and quotation time >> > > > >> > > > >> > > > > Hi, >> > > > > >> > > > > barTime % 100 == 0 will not work reliably! If there is no new tick >> > > > > or no CPU >> > > > > time to do refresh it will skipp new bars a few times! >> > > > > This is a common problem. Look for similar posts here. You will >> > > > > fined code >> > > > > samples. >> > > > > >> > > > > Y >> > > > > -------------------------------------------------- >> > > > > From: "Mike" <sfclimbers@> >> > > > > Sent: Tuesday, March 17, 2009 4:04 AM >> > > > > To: <[email protected]> >> > > > > Subject: [amibroker] Re: Testing for new bar using string >> > > > > manipulation and >> > > > > quotation time >> > > > > >> > > > >> If you have any concerns about rounding, you could use AlmostEqual >> > > > >> instead >> > > > >> of "==". >> > > > >> >> > > > >> http://www.amibroker.com/guide/afl/afl_view.php?id=301 >> > > > >> >> > > > >> Mike >> > > > >> >> > > > >> --- In [email protected], "ozzyapeman" <zoopfree@> wrote: >> > > > >>> >> > > > >>> Thanks a bunch, Mike. Modulo's so much simpler! >> > > > >>> >> > > > >>> >> > > > >>> --- In [email protected], "Mike" <sfclimbers@> wrote: >> > > > >>> > >> > > > >>> > Again, assuming that your approach is sound, better still would >> > > > >>> > be to >> > > > >>> > use the modulo operator. >> > > > >>> > >> > > > >>> > barTime = 103731; >> > > > >>> > >> > > > >>> > if (barTime % 100 == 0) >> > > > >>> > _TRACE( "New bar found" ); >> > > > >>> > >> > > > >>> > Mike >> > > > >>> > >> > > > >>> > --- In [email protected], "Mike" <sfclimbers@> wrote: >> > > > >>> > > >> > > > >>> > > Without commenting on the validity of the approach (I am not a >> > > > >>> > > real >> > > > >>> > > time trader), I can suggest that your problem is coming from a >> > > > >>> > > formatting incompatibility. >> > > > >>> > > >> > > > >>> > > Add a format clause indicating zero decimal places and it will >> > > > >>> > > work >> > > > >>> > > fine. >> > > > >>> > > >> > > > >>> > > Note too that your switching back to a number again is >> > > > >>> > > redundant and >> > > > >>> > > even error prone since "==" is not necessarily exact when >> > > > >>> > > dealing >> > > > >>> > > with floats. Just use the string manipulation directly. >> > > > >>> > > >> > > > >>> > > barTime = 103731; >> > > > >>> > > barTimeStr = NumToStr( barTime, 6.0 ); >> > > > >>> > > >> > > > >>> > > if ( StrRight( barTimeStr, 2 ) == "00" ) >> > > > >>> > > _TRACE ( "New bar found" ); >> > > > >>> > > >> > > > >>> > > Mike >> > > > >>> > > >> > > > >>> > > --- In [email protected], "ozzyapeman" <zoopfree@> >> > > > >>> > > wrote: >> > > > >>> > > > >> > > > >>> > > > Hello, hoping someone can help out with this string >> > > > >>> > > > conversion >> > > > >>> > > > problem. >> > > > >>> > > > >> > > > >>> > > > In live trading, I am pulling quotation time using >> > > > >>> > > > TimeNum(), and >> > > > >>> > > > want >> > > > >>> > > > to test for the start of a new bar. So my thinking is to >> > > > >>> > > > simply >> > > > >>> > > > convert >> > > > >>> > > > the time to a number, extract the last two characters, >> > > > >>> > > > convert back >> > > > >>> > > > to a >> > > > >>> > > > number and see if it equals 0. If so, that means the last two >> > > > >>> > > > digits in >> > > > >>> > > > the quotation time are "00" and hence we are at the start of >> > > > >>> > > > a new >> > > > >>> > > > bar. >> > > > >>> > > > >> > > > >>> > > > However, the sample code below is always thinking we have a >> > > > >>> > > > new bar >> > > > >>> > > > whether the time is, for e.g. : >> > > > >>> > > > >> > > > >>> > > > 10:37:31 or >> > > > >>> > > > 10:37:00 >> > > > >>> > > > >> > > > >>> > > > Obviously, only the second time should trip the 'new bar' >> > > > >>> > > > print. >> > > > >>> > > > But >> > > > >>> > > > instead, both do: >> > > > >>> > > > >> > > > >>> > > > >> > > > >>> > > > barTime = 103731; // we would normally use TimeNum() >> > > > >>> > > > here, >> > > > >>> > > > but >> > > > >>> > > > using a number for example >> > > > >>> > > > >> > > > >>> > > > barTimeStr = NumToStr(barTime); >> > > > >>> > > > >> > > > >>> > > > NewBarSeconds = StrToNum ( StrRight(barTimeStr, 2) ); >> > > > >>> > > > >> > > > >>> > > > printf("NewBarSeconds = " + NewBarSeconds); >> > > > >>> > > > >> > > > >>> > > > if (NewBarSeconds == 0) >> > > > >>> > > > >> > > > >>> > > > printf(" We have a new bar"); >> > > > >>> > > > >> > > > >>> > > >> > > > >>> > >> > > > >>> >> > > > >> >> > > > >> >> > > > >> >> > > > >> >> > > > >> ------------------------------------ >> > > > >> >> > > > >> **** IMPORTANT PLEASE READ **** >> > > > >> This group is for the discussion between users only. >> > > > >> This is *NOT* technical support channel. >> > > > >> >> > > > >> TO GET TECHNICAL SUPPORT send an e-mail directly to >> > > > >> SUPPORT {at} amibroker.com >> > > > >> >> > > > >> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at >> > > > >> http://www.amibroker.com/feedback/ >> > > > >> (submissions sent via other channels won't be considered) >> > > > >> >> > > > >> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: >> > > > >> http://www.amibroker.com/devlog/ >> > > > >> >> > > > >> Yahoo! Groups Links >> > > > >> >> > > > >> >> > > > >> >> > > > >> >> > > > > >> > > > > >> > > > > ------------------------------------ >> > > > > >> > > > > **** IMPORTANT PLEASE READ **** >> > > > > This group is for the discussion between users only. >> > > > > This is *NOT* technical support channel. >> > > > > >> > > > > TO GET TECHNICAL SUPPORT send an e-mail directly to >> > > > > SUPPORT {at} amibroker.com >> > > > > >> > > > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at >> > > > > http://www.amibroker.com/feedback/ >> > > > > (submissions sent via other channels won't be considered) >> > > > > >> > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: >> > > > > http://www.amibroker.com/devlog/ >> > > > > >> > > > > Yahoo! Groups Links >> > > > > >> > > > > >> > > > > >> > > > >> > > >> > >> > > > > > ------------------------------------ > > **** IMPORTANT PLEASE READ **** > This group is for the discussion between users only. > This is *NOT* technical support channel. > > TO GET TECHNICAL SUPPORT send an e-mail directly to > SUPPORT {at} amibroker.com > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at > http://www.amibroker.com/feedback/ > (submissions sent via other channels won't be considered) > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > http://www.amibroker.com/devlog/ > > Yahoo! Groups Links > > >
