Highest / HighestAll problem in my little script

[lolo]

Hello everyone,

I wanted to create a script that calculates the percentage difference between the Pre Market high preferably 04:00 a.m until 09:29 a.m. editable.

An error appeared, the text HighestAll (Period is highlighted in red.

Can someone fix this problem?

input period_Type = AggregationPeriod.DAY;
input PrestartTime = 0400;
input PreendTime = 0929;

def begin = Highest(period = period_Type);
def end = close(period = period_Type);
def NetChg = begin - end;
def PctChg = (begin / end) - 1;

AddLabel(yes, Concat("%PM High to open = " , end), color.white);

Thanks a lot.

 

[halcyonguy]

i need a way to get the median of a var for all the bars on the chart.

something like medianAll doesn't exist
highestAll exists.

you can get "averageAll" by doing totalSum(var)/barnumber()
that gets you the average for all the bars

but i dont know how to get the median for all the bars.

EDIT -
this is not the median ,
it is a value from the middle bar, in a set of bars

a median number, requires the data set to be put in order, and i didn't do that in this code.

-------------------------------------
is this what you want?

median,
middle number of a set

def lastbar = !isnan(close) and isnan(close[-1]);
def barz = floor(barnumber()/2);
def med = if lastbar then getvalue(close, barz) else 0;
addlabel(1, med, color.yellow);
#

untested

https://www.mathsisfun.com/median.html

https://www.khanacademy.org/math/st...n-median-basics/a/mean-median-and-mode-review

 

[tatl]

@halcyonguy
not sure i understand this solution.
a simpler way to ask my question is: how could i find the median volume on a chart?

the same way you could do:
highestAll(volume)

i wish i could do:
medianAll(volume)
to find the middle value of all the volumes.

 

[halcyonguy]

@halcyonguy
not sure i understand this solution.
a simpler way to ask my question is: how could i find the median volume on a chart?

the same way you could do:
highestAll(volume)

i wish i could do:
medianAll(volume)
to find the middle value of all the volumes.

sorry, i jumped the gun , and answered too quickly on my cell.

a median number , is the middle number of an 'ordered' set of numbers.
i forgot the ordered part.. my code just finds the middle value, without reordering the data.

i will think on this...

-------

i can sort data and find the median.
just need to test a bit and clean it up

 

[halcyonguy]

@halcyonguy
not sure i understand this solution.
a simpler way to ask my question is: how could i find the median volume on a chart?

the same way you could do:
highestAll(volume)

i wish i could do:
medianAll(volume)
to find the middle value of all the volumes.

is this what you want?

find median of all the volume bars (or some quantity from the last bar)

i have it as an upper study, now for testing, easier to see...

a sample

have to go, but will get back to this later....

 

[tatl]

@halcyonguy
thanks for giving it a go again, but not quite! that finds the median bar and then tells you its volume.

the median volume Value may not be the volume of the median bar. it may be some other bar.

for example for a chart with 5 bars on it, the median bar is the 3rd bar.

and lets say the volume values for the bars are:
5, 3 , 1 , 5 , 5

but the median bar's volume value would be 1

but the median volume value for all of them is 3.

i'm looking for the 3. the actual median volume value. it doesn't matter what bar its on.

 

[mashume]

This will get you the median volume on a lower plot:

declare lower;
input length = 50;
def v = volume;
plot median_volume = median(data = v, length = length);

There is no medianAll, but you can set the length to something lengthy and get an approximation of medianAll().

-mashume

 

[halcyonguy]

@halcyonguy
thanks for giving it a go again, but not quite! that finds the median bar and then tells you its volume.

no, it doesn't.
but i guess it's hard to tell from a picture.
it resorts all the volume values ,
then finds the middle of that resorted list,
and reads a value from the resorted list,
NOT the middle volume bar.

the median volume Value may not be the volume of the median bar. it may be some other bar.

for example for a chart with 5 bars on it, the median bar is the 3rd bar.

and lets say the volume values for the bars are:
5, 3 , 1 , 5 , 5

but the median bar's volume value would be 1

but the median volume value for all of them is 3.

i'm looking for the 3. the actual median volume value. it doesn't matter what bar its on.

that's not median.
that's not what those links say that i posted.

-----

LOL, good grief , there is a median function?
i seem to find the hardest way to do things.....

will compare it to mine

 

[tatl]

This will get you the median volume on a lower plot:

declare lower;
input length = 50;
def v = volume;
plot median_volume = median(data = v, length = length);

There is no medianAll, but you can set the length to something lengthy and get an approximation of medianAll().

-mashume

indeed. i'm just looking for the value to adjust to the current median on a constant basis bcuz i'm using the variable in another function. has to be real time

 

[mashume]

indeed. i'm just looking for the value to adjust to the current median on a constant basis bcuz i'm using the variable in another function. has to be real time

You're gunna have to give us a bit more to work with than that. The better you describe (and provide code if you can) what you're trying to do, the better we'll be able to help you get where you want to be. Also, what do you mean by 'real time'? Since it is not using an xyzAll() function (which now only update once per bar) or put declare once_per_bar at the head of your script, it will update as the price changes.

You can use the value of median_volume anywhere else in your script you need, obviously. But now I'm just taking guesses at what you're thinking because I really don't know.

-mashume

 

[tatl]

@mashume
all i meant was,

for example on a 2m Today chart, during normal trading hours:

i need the median volume value for all bars, but the bars will keep appearing and increasing. so the fixed length in the median() function isn't getting me all the bars.

best !

 

[mashume]

There are 390 one-minute bars in a trading session, so 195 2 min bars. Set that as your length, and go from there.

-mashume