What Is The Proper Use of barNumber()?

[joseraul]

Hi!

I'm trying to build a vwap that can ignore the first bars "under demand".
This is what I have so far:

input ignoreBars = 5;

def sinceBar = barNumber() - ignoreBars;
def priceVolume = close * volume;
def cumulativePriceVolume = sum(priceVolume, sinceBar);
def cumulativeVolume = sum(volume, sinceBar);
def vwapValue = cumulativePriceVolume / cumulativeVolume;

plot vwapPlot = vwapValue;

Apparently, "sum" doesn't like the dynamic "sinceBar" and it fails with "Only constants expected here"

Does anyone have an idea of how to fix this? Or maybe a better approach?
Thanks in advance!

PS: I'm pretty new on Thinkscript world, so I don't know if what I'm asking is very obvious

 

[Joshua]

It would be something more along the lines of this;

def cumulativePriceVolume = if BarNumber() > IgnoreBars then cumulativePriceVolume[1] + (close * volume) else Double.NaN;

https://usethinkscript.com/threads/thinkscript-barnumber-function-usage-and-examples.673/

 

[Nes]

Hi, I’m not a coder so sorry if I’m asking a dumb question. I am trying to get the number of bars for today only to pop up on a label but my script currently has “barnumber()” and if I have a 3 day 15 min time frame it will all the bars in the last 3 days. Is there any way to show just today’s barnumbers w/0 premarket? Need this number for a formula. Thanks for any help.

 

[halcyonguy]

Hi, I’m not a coder so sorry if I’m asking a dumb question. I am trying to get the number of bars for today only to pop up on a label but my script currently has “barnumber()” and if I have a 3 day 15 min time frame it will all the bars in the last 3 days. Is there any way to show just today’s barnumbers w/0 premarket? Need this number for a formula. Thanks for any help.

this will show 2 labels. one of them will have the quantity of bars in a normal trading day.

def bn = barnumber();
def price = close;
input chart_stat_labels = yes;

# 390min in a day
def chartagg = GetAggregationPeriod();
def chartmin = (chartagg / 1000) / 60;
AddLabel(chart_stat_labels, "chartmin " + chartmin, Color.MAGENTA);

def daybarqty = roundup(390 / chartmin, 0);
AddLabel(chart_stat_labels, "bars per day " + daybarqty, Color.MAGENTA);

 

[Nes]

this will show 2 labels. one of them will have the quantity of bars in a normal trading day.

def bn = barnumber();
def price = close;
input chart_stat_labels = yes;

# 390min in a day
def chartagg = GetAggregationPeriod();
def chartmin = (chartagg / 1000) / 60;
AddLabel(chart_stat_labels, "chartmin " + chartmin, Color.MAGENTA);

def daybarqty = roundup(390 / chartmin, 0);
AddLabel(chart_stat_labels, "bars per day " + daybarqty, Color.MAGENTA);

Thank you! It worked! Is there any way to get the barnumber live as the trading day progresses? For example, instead of showing the set number of bars in a day for a specific time frame it will show ( on a 5 min ) bars for day = 1 from 6:30 to 6:35, then from 6:35 to 6:40 it would show bars for day = 2, then from 6:40 to 6:45 it would show bars for day = 3 etc...

 

[Nes]

Thank you! It worked! Is there any way to get the barnumber live as the trading day progresses? For example, instead of showing the set number of bars in a day for a specific time frame it will show ( on a 5 min ) bars for day = 1 from 6:30 to 6:35, then from 6:35 to 6:40 it would show bars for day = 2, then from 6:40 to 6:45 it would show bars for day = 3 etc...

Sorry I didnt explain as well in the first msg.

 

[halcyonguy]

Thank you! It worked! Is there any way to get the barnumber live as the trading day progresses? For example, instead of showing the set number of bars in a day for a specific time frame it will show ( on a 5 min ) bars for day = 1 from 6:30 to 6:35, then from 6:35 to 6:40 it would show bars for day = 2, then from 6:40 to 6:45 it would show bars for day = 3 etc...

this will,
..calculate the quantity of bars/day, for any time less than DAY.
..show a label , with the current bar# of the day
..show bubbles under the candles, with current bar# ( can turn off with an input variable)

# chart_time_stats2

def bn = barnumber();
def istoday = if GetLastDay() == GetDay() then 1 else 0;
def price = close;
input chart_stat_labels = yes;

# 390min in a day
def chartagg = GetAggregationPeriod();
def chartmin = (chartagg / 1000) / 60;
AddLabel(chart_stat_labels, "chartmin " + chartmin, Color.MAGENTA);

def minz;
if chartmin == 60 then {
 minz = 420;
} else if chartmin == 120 then {
 minz = 480;
} else if chartmin == 240 then {
 minz = 480;
} else {
minz = 390;
}

def daybarqty = roundup(minz / chartmin, 0);
AddLabel(chart_stat_labels, "bars per day " + daybarqty, Color.MAGENTA);

input start = 0930;
def mins = (secondsfromTime(start)/60);

def current_bar = ((mins/minz) * daybarqty) + 1;

addlabel(1, "bar # " + current_bar + " / " + daybarqty, color.cyan);

input test1_barcnt = yes;
addchartbubble(test1_barcnt, low,
 current_bar  + "\n" +
 daybarqty
, color.cyan, no);

input test2 = no;
addchartbubble(test2, low,
 mins + "\n" +
# (mins/390)  + "\n" +
 (mins/minz)  + "\n" +
 current_bar  + "\n" +
 daybarqty
, color.cyan, no);
#