Output array with label AFTER sort?

This topic has 30 replies, 4 voices, and was last updated 2 months ago by robertogozzi.

Tagged: array, bubble, bubble sort, sort, sorting

Viewing 15 posts - 1 through 15 (of 31 total)

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01/09/2022 at 12:59 PM #184936

robdav

I think I know the answer to this already but is it possible to associate a label with array entries so that they stay in the correct place after an arraysort?

In the hypothetical example below, it works until I sort the array and then you would lose the label order obviously.

defparam drawonlastbaronly = true

ema5 = exponentialaverage[5](close)
ema10 = exponentialaverage[10](close)
ema21 = exponentialaverage[21](close)
sma50 = average[50](close)
sma100 = average[100](close)
sma200 = average[200](close)

// create ma array

$ma[1] = ema5
$ma[2] = ema10
$ma[3] = ema21
$ma[4] = sma50
$ma[5] = sma100
$ma[6] = sma200

// output ma array

for j = 1 to lastset($ma)
mymas = $ma[j]
drawtext("#mymas#",barindex+50,j*0.1) coloured("blue")
next

// create ma label array

$malabel[1] = 5
$malabel[2] = 10
$malabel[3] = 21
$malabel[4] = 50
$malabel[5] = 100
$malabel[6] = 200

// output may label array

for j = 1 to lastset($malabel)
mymalabel = $malabel[j]
drawtext("ma #mymalabel#",barindex,j*0.1) coloured("blue")
next

return

defparam drawonlastbaronly = true

ema5 = exponentialaverage[5](close)

ema10 = exponentialaverage[10](close)

ema21 = exponentialaverage[21](close)

sma50 = average[50](close)

sma100 = average[100](close)

sma200 = average[200](close)

// create ma array

$ma[1] = ema5

$ma[2] = ema10

$ma[3] = ema21

$ma[4] = sma50

$ma[5] = sma100

$ma[6] = sma200

// output ma array

for j = 1 to lastset($ma)

mymas = $ma[j]

drawtext("#mymas#",barindex+50,j*0.1) coloured("blue")

// create ma label array

$malabel[1] = 5

$malabel[2] = 10

$malabel[3] = 21

$malabel[4] = 50

$malabel[5] = 100

$malabel[6] = 200

// output may label array

for j = 1 to lastset($malabel)

mymalabel = $malabel[j]

drawtext("ma #mymalabel#",barindex,j*0.1) coloured("blue")

return

Is there a way this could be achieved?

Thanks

Rob

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01/09/2022 at 1:36 PM #184939

robertogozzi

You need to use two arrays, 1 for data and 1 for labels, then sort them using custom code (such as bubble sort), provided arrays arrays are not too large.

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robdav

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01/12/2022 at 8:04 PM #185303

robdav

I have bubble sorted my array and realised I have duplicates to remove which I have kind of done by using a second array.

However, I would like to use the same array but I end up with ‘n/a’ displaying (after drawtext) where the duplicates have been removed.

Could someone please help? Been going round in circles!

Thanks, Rob

j = 0
for i = 0 to lastset($ma)
if $ma[i] <> $ma[i+1] then
$temp[j] = $ma[i]
j = j + 1
endif
$ma[i] = $temp[i]
next

j = 0

for i = 0 to lastset($ma)

if $ma[i] <> $ma[i+1] then

$temp[j] = $ma[i]

j = j + 1

endif

$ma[i] = $temp[i]

robdav

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01/12/2022 at 11:52 PM #185312

robertogozzi

It’s because I and J retain different values.

It may happen that in line 7 $temp[i] has not yet been created,

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01/13/2022 at 8:02 AM #185314

robdav

Thanks Roberto.

Is it possible to just use the same array, I would like to try example 2 of this pseudo code but have struggled to translate it in ProBuilder?

https://www.codesdope.com/blog/article/remove-duplicate-elements-from-sorted-array/

Thanks again.

robdav

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01/13/2022 at 12:15 PM #185332

robertogozzi

EDITED
This code is incorrect. The correct one is at https://www.prorealcode.com/topic/output-array-with-label-after-sort/page/2/#post-236336

This is the Bubble Sort snippet:

// Data array  $da
// Label Array $la
//
MaxElement = lastset($da)
FOR i = 0 TO MaxElement
   FOR j = 0 TO MaxElement
      IF $da[j] > $da[i] THEN
         // swap data
         temp   = $da[j]
         $da[j] = $da[i]
         $da[i] = temp
         // swap labels
         temp   = $la[j]
         $la[j] = $la[i]
         $la[i] = temp
      ENDIF
   NEXT
NEXT

// Data array $da

// Label Array $la

MaxElement = lastset($da)

FOR i = 0 TO MaxElement

FOR j = 0 TO MaxElement

IF $da[j] > $da[i] THEN

// swap data

temp = $da[j]

$da[j] = $da[i]

$da[i] = temp

// swap labels

temp = $la[j]

$la[j] = $la[i]

$la[i] = temp

ENDIF

EDITED
The code for the BUBBLE SORT is incorrect. The correct one is at https://www.prorealcode.com/topic/output-array-with-label-after-sort/page/2/#post-236336

This an indicator (example) to be added ON the price chart:

// Data array  $da
// Label Array $la
//
defparam drawonlastbaronly = true
// fill up both arrays
for k = 0 to 7
   $da[k] = close[k]    //data   (CLOSE from the current one backwards to the previous 7 bars)
   $la[k] = k           //labels (index reference)
next
MaxElement = lastset($da)
temp = MaxElement+1
drawtext("Elements #temp#",BarIndex,low - range)
for k = 0 to MaxElement
   x = $da[k]
   drawtext("close[#k#]:  #x#",BarIndex-10,high + (range * k))
next
// Bubble Sort
FOR i = 0 TO MaxElement
  FOR j = 0 TO MaxElement
      IF $da[j] > $da[i] THEN
         // swap data
         temp   = $da[j]
         $da[j] = $da[i]
         $da[i] = temp
         // swap labels
         temp   = $la[j]
         $la[j] = $la[i]
         $la[i] = temp
      ENDIF
   NEXT
NEXT
temp = MaxElement+1
drawtext("Elements #temp#",BarIndex,low - range)
for k = 0 to MaxElement
   x = $da[k]
   drawtext("close[#k#]:  #x#",BarIndex,high + (range * k))
next
return

// Data array $da

// Label Array $la

defparam drawonlastbaronly = true

// fill up both arrays

for k = 0 to 7

$da[k] = close[k] //data (CLOSE from the current one backwards to the previous 7 bars)

$la[k] = k //labels (index reference)

MaxElement = lastset($da)

temp = MaxElement+1

drawtext("Elements #temp#",BarIndex,low - range)

for k = 0 to MaxElement

x = $da[k]

drawtext("close[#k#]: #x#",BarIndex-10,high + (range * k))

// Bubble Sort

FOR i = 0 TO MaxElement

FOR j = 0 TO MaxElement

IF $da[j] > $da[i] THEN

// swap data

temp = $da[j]

$da[j] = $da[i]

$da[i] = temp

// swap labels

temp = $la[j]

$la[j] = $la[i]

$la[i] = temp

ENDIF

temp = MaxElement+1

drawtext("Elements #temp#",BarIndex,low - range)

for k = 0 to MaxElement

x = $da[k]

drawtext("close[#k#]: #x#",BarIndex,high + (range * k))

return

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robdav

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01/13/2022 at 12:49 PM #185338

robdav

Perfect!

Thank you.

robdav

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01/13/2022 at 2:39 PM #185347

robertogozzi

Sorry, I just realized there’s an error in my pic and in the example (it’s an error concerning display only, the sorting code is correct). This is correct:

// Data array  $da
// Label Array $la
//
defparam drawonlastbaronly = true
for k = 0 to 7
   $da[k] = close[k]
   $la[k] = k
next
MaxElements = lastset($da)
temp = MaxElements+1
drawtext("Elements #temp#",BarIndex,low - range)
for k = 0 to MaxElements
   x = $da[k]
   y = $la[k]
   drawtext("close[#y#]:  #x#",BarIndex-10,high + (range * k))
next
//sorting
FOR i = 0 TO MaxElements
   FOR j = 0 TO MaxElements
      IF $da[j] > $da[i] THEN
         // swap data
         temp   = $da[j]
         $da[j] = $da[i]
         $da[i] = temp
         // swap labels
         temp   = $la[j]
         $la[j] = $la[i]
         $la[i] = temp
      ENDIF
   NEXT
NEXT
temp = MaxElements+1
drawtext("Elements #temp#",BarIndex,low - range)
for k = 0 to MaxElements
   x = $da[k]
   y = $la[k]
   drawtext("close[#y#]:  #x#",BarIndex,high + (range * k))
next
return

// Data array $da

// Label Array $la

defparam drawonlastbaronly = true

for k = 0 to 7

$da[k] = close[k]

$la[k] = k

MaxElements = lastset($da)

temp = MaxElements+1

drawtext("Elements #temp#",BarIndex,low - range)

for k = 0 to MaxElements

x = $da[k]

y = $la[k]

drawtext("close[#y#]: #x#",BarIndex-10,high + (range * k))

//sorting

FOR i = 0 TO MaxElements

FOR j = 0 TO MaxElements

IF $da[j] > $da[i] THEN

// swap data

temp = $da[j]

$da[j] = $da[i]

$da[i] = temp

// swap labels

temp = $la[j]

$la[j] = $la[i]

$la[i] = temp

ENDIF

temp = MaxElements+1

drawtext("Elements #temp#",BarIndex,low - range)

for k = 0 to MaxElements

x = $da[k]

y = $la[k]

drawtext("close[#y#]: #x#",BarIndex,high + (range * k))

return

the error was in DRAWTEXT. The second block prints the correct (sorted) data, but the wrong labels (as they shall NOT sorted, as they follow the sorted data).

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robdav

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01/13/2022 at 8:33 PM #185367

robdav

Thanks, is it possible to remove duplicates after the array/s have been sorted?

I’m guessing the non duplicates may need to go into a new array or can we reset the original array and then copy the non dupliate values in? This is the bit I’m struggling with. I thought I was there earlier and then tried it on some different values and my code clearly doesn’t work.

Thanks again. Rob

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01/14/2022 at 1:04 PM #185443

robertogozzi

This version removes duplicates (I created two new, separate, arrays):

// Data array  $da     ($dx is new array without duplicates)
// Label Array $la     ($lx is new array without duplicates)
//
defparam drawonlastbaronly = true
// fill up the array with CLOSE and Bar ID (label)
for k = 0 to 7
   $da[k] = round((close[k] - 0.5))
   $la[k] = k
next
MaxElements = lastset($da)
//////////////////////////////////////////////////////////////////
// plot unsorted arrays
temp = MaxElements + 1
Offset = average[10](range[1])
drawtext("Elements #temp#",BarIndex-20,low - range)
for k = 0 to MaxElements
   x = $da[k]
   y = $la[k]
   drawtext("close[#y#]:  #x#",BarIndex-20,high + (Offset * k))
next
//////////////////////////////////////////////////////////////////
// (Bubble Sort)
FOR i = 0 TO MaxElements
   FOR j = 0 TO MaxElements
      IF $da[j] > $da[i] THEN
         // swap data
         temp   = $da[j]
         $da[j] = $da[i]
         $da[i] = temp
         // swap labels
         temp   = $la[j]
         $la[j] = $la[i]
         $la[i] = temp
      ENDIF
   NEXT
NEXT
//////////////////////////////////////////////////////////////////
// plot Sorted arrays
for k = 0 to MaxElements
   x = $da[k]
   y = $la[k]
   drawtext("close[#y#]:  #x#",BarIndex-10,high + (Offset * k))
next
//////////////////////////////////////////////////////////////////
// remove duplicates by comparing the current element to the next one (creating 2 new arrays)
NewMaxElements = 0
FOR i = 0 TO MaxElements
   IF ($da[i] <> $da[i + 1]) OR (i = MaxElements) THEN
      $dx[NewMaxElements] = $da[i]          //save datum to new array, when different
      $lx[NewMaxElements] = $la[i]          //save label, too
      NewMaxElements      = NewMaxElements + 1
   ENDIF
NEXT
//////////////////////////////////////////////////////////////////
// plot new Arrays (without duplicates)
temp = NewMaxElements
drawtext("Elements #temp#",BarIndex,low - range)
FOR k = 0 to NewMaxElements - 1
   x = $dx[k]
   y = $lx[k]
   drawtext("close[#y#]:  #x#",BarIndex,high + (Offset * k))
NEXT
return

// Data array $da ($dx is new array without duplicates)

// Label Array $la ($lx is new array without duplicates)

defparam drawonlastbaronly = true

// fill up the array with CLOSE and Bar ID (label)

for k = 0 to 7

$da[k] = round((close[k] - 0.5))

$la[k] = k

MaxElements = lastset($da)

//////////////////////////////////////////////////////////////////

// plot unsorted arrays

temp = MaxElements + 1

Offset = average[10](range[1])

drawtext("Elements #temp#",BarIndex-20,low - range)

for k = 0 to MaxElements

x = $da[k]

y = $la[k]

drawtext("close[#y#]: #x#",BarIndex-20,high + (Offset * k))

//////////////////////////////////////////////////////////////////

// (Bubble Sort)

FOR i = 0 TO MaxElements

FOR j = 0 TO MaxElements

IF $da[j] > $da[i] THEN

// swap data

temp = $da[j]

$da[j] = $da[i]

$da[i] = temp

// swap labels

temp = $la[j]

$la[j] = $la[i]

$la[i] = temp

ENDIF

//////////////////////////////////////////////////////////////////

// plot Sorted arrays

for k = 0 to MaxElements

x = $da[k]

y = $la[k]

drawtext("close[#y#]: #x#",BarIndex-10,high + (Offset * k))

//////////////////////////////////////////////////////////////////

// remove duplicates by comparing the current element to the next one (creating 2 new arrays)

NewMaxElements = 0

FOR i = 0 TO MaxElements

IF ($da[i] <> $da[i + 1]) OR (i = MaxElements) THEN

$dx[NewMaxElements] = $da[i] //save datum to new array, when different

$lx[NewMaxElements] = $la[i] //save label, too

NewMaxElements = NewMaxElements + 1

ENDIF

//////////////////////////////////////////////////////////////////

// plot new Arrays (without duplicates)

temp = NewMaxElements

drawtext("Elements #temp#",BarIndex,low - range)

FOR k = 0 to NewMaxElements - 1

x = $dx[k]

y = $lx[k]

drawtext("close[#y#]: #x#",BarIndex,high + (Offset * k))

return

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Finning,

robdav

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01/14/2022 at 3:46 PM #185461

robdav

Thanks so much Roberto!

I’ve just wasted the morning doing it old school without arrays and then I see this!

Hopefully it will get added to the code snippet spreadsheet so others can benefit.

Really appreciate this a lot.

Thank you.

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robertogozzi

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01/15/2022 at 11:19 AM #185530

GraHal

Link to code above added as Log 313 here …

Snippet Link Library

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robertogozzi

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08/09/2024 at 12:05 PM #236294

Finning

Hi @robertogozzi

I’m having some troubles with the above bubble sort code.

I’m trying to use an array for $da[k].

So, as per the code below, I’m using an array to sum up ($da[k]) the number of crosses at close of moving average k back to calculateonlastbars, with the moving average period k also being stored for identification in $la[k].

What seems to be happening, is that if I delete all of the bubble sort and remove duplicates code, $da[k] seems to fill with the correct data, and work as it should. The code I’m using for that is below, to show that $da[k] is filling correctly, and giving an answer of 2 or so, which is what you would expect.

defparam drawonlastbaronly = true
defparam calculateonlastbars=100
// fill up the array with CLOSE and Bar ID (label)
for k = 1 to 40

averageline = average[k](close)

if (close>averageline and open<averageline) or (close<averageline and open>averageline)  then  

newcount = 1
else
newcount=0

endif

once $da[k]=0

$da[k] = newcount+$da[k]

$la[k] = k

next

FOR k = 0 to 40
x = $da[k]
y = $la[k]
drawtext("close[#y#]:  #x#",BarIndex+2, (y*2))
next

return

defparam drawonlastbaronly = true

defparam calculateonlastbars=100

// fill up the array with CLOSE and Bar ID (label)

for k = 1 to 40

averageline = average[k](close)

if (close>averageline and open<averageline) or (close<averageline and open>averageline) then

newcount = 1

else

newcount=0

endif

once $da[k]=0

$da[k] = newcount+$da[k]

$la[k] = k

FOR k = 0 to 40

x = $da[k]

y = $la[k]

drawtext("close[#y#]: #x#",BarIndex+2, (y*2))

return

For this, have a look at the attached pic, MA crossover array dump no bubble sort

The code with the bubble sort and duplicate removal that I am using is below:

defparam drawonlastbaronly = true
defparam calculateonlastbars=100
// fill up the array with CLOSE and Bar ID (label)
for k = 1 to 40

defparam drawonlastbaronly = true

defparam calculateonlastbars=100

// fill up the array with CLOSE and Bar ID (label)

for k = 1 to 40

averageline = average[k](close)

if (close>averageline and open<averageline) or (closeaverageline) then

newcount = 1
else
newcount=0

endif

once $da[k]=0

$da[k] = newcount+$da[k]

$la[k] = k

MaxElements = lastset($da)
//////////////////////////////////////////////////////////////////
// plot unsorted arrays
temp = MaxElements + 1
Offset = average[10](range[1])
drawtext(“Elements #temp#”,BarIndex-20,low – range)
for k = 0 to MaxElements
x = $da[k]
y = $la[k]
drawtext(“close[#y#]: #x#”,BarIndex-20,high + (Offset * k))
next
//////////////////////////////////////////////////////////////////
// (Bubble Sort)
FOR i = 0 TO MaxElements
FOR j = 0 TO MaxElements
IF $da[j] > $da[i] THEN
// swap data
temp = $da[j]
$da[j] = $da[i]
$da[i] = temp
// swap labels
temp = $la[j]
$la[j] = $la[i]
$la[i] = temp
ENDIF
NEXT
NEXT
//////////////////////////////////////////////////////////////////
// plot Sorted arrays
for k = 0 to MaxElements
x = $da[k]
y = $la[k]
drawtext(“close[#y#]: #x#”,BarIndex-10,high + (Offset * k))
next
//////////////////////////////////////////////////////////////////
// remove duplicates by comparing the current element to the next one (creating 2 new arrays)
NewMaxElements = 0
FOR i = 0 TO MaxElements
IF ($da[i] <> $da[i + 1]) OR (i = MaxElements) THEN
$dx[NewMaxElements] = $da[i] //save datum to new array, when different
$lx[NewMaxElements] = $la[i] //save label, too
NewMaxElements = NewMaxElements + 1
ENDIF
NEXT
//////////////////////////////////////////////////////////////////
// plot new Arrays (without duplicates)
temp = NewMaxElements
drawtext(“Elements #temp#”,BarIndex,low – range)
FOR k = 0 to NewMaxElements – 1
x = $dx[k]
y = $lx[k]
drawtext(“close[#y#]: #x#”,BarIndex,high + (Offset * k))
NEXT

return

For the results of this, have a look at the attached pic, MA crossover with bubble sort code applied

It seems to be that the bubble sort/duplicate removal is causing an error in the initial correct filling of $da[k], and from this the wrong answer is then given.

Is there any way that this could be made to work as intended, so that the bubble sort will actually give the correct period with the maximum number of cross overs of the average?

Many thanks,

Finning

PS – try as I might, the insert code button doesn’t seem to be working!!

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08/09/2024 at 6:06 PM #236304

robertogozzi

As you can see from the attached pic, all seems to be plotted correctly.

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08/10/2024 at 10:26 AM #236309

Finning

Hi Roberto,

thanks for having a look.

Yes, I agree, your code is working properly, and is plotting correctly.

However, that is not the problem that I’m having.

The problem is, is that the bubble sort and/or the duplication removal code, is changing the result of what I am trying the $da[k] array to store in the first place.

The bubble sort is changing what is making its way into the $da[k] array, and this is the problem that I need help with.

I have attached 2 picture output examples, using my code posted above (sorry I couldn’t get the above code to display properly despite trying) to show this, and I slightly changed where the plot offsets were on the screen to make it all fit, and changed the loop size to 20, to make it all fit.

One pic is of the $da[k] with the bubble sort/duplication removal code present, and the other pic is $da[k] the bubble sort/duplication removal code NOT present (deleted).

This shows the problem that I am having with the bubble sort/duplication removal code affecting what is stored in $da[k]. This is the problem I need help with please.

In the pic above that you sent me, the bubble sort/duplication deletion was working fine, yes, the only problem is the data that it was sorting stored in $da[k] was wrong.

I hope I have made the problem I am having a bit more clear, and I sure do hope that you could help!

Many thanks,

Finning

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