### Author Topic: {Resolved}How to find the duplicate items in the list  (Read 9056 times)

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#### xiaxiang

• Guest
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #15 on: January 15, 2015, 04:34:51 AM »
Quote
OK, here's an iterative + imperative attempt by first sorting the list:
Code: [Select]
`_\$ (List:DuplicatesEq2 '(1.0 1.1 1.19 1.2 1.21 1.22 1.23 1.25 1.3 ) 0.05)((1.19 1.2 1.21 1.22 1.23 1.25))_\$ (List:DuplicatesEq2 '(1.0 1.1 1.19 5.0 5.01 4.98 1.2 1.21 1.22 1.23 1.3) 0.05)((1.19 1.2 1.21 1.22 1.23) (4.98 5.0 5.01))`
Minor error
Code: [Select]
`(List:DuplicatesEq2 '(1.0 1.1 1.19 1.2 1.2 1.21 1.22 1.23 1.25 1.3 2.0 2.1 2.19 2.2 2.2 2.21 2.22 2.23 2.25 2.3) 0.05)-->((1.19 1.2 1.2 1.21 1.22 1.23 1.25) (2.19 2.2 2.2 2.21 2.22 2.23 2.25 2.3))`
« Last Edit: January 15, 2015, 04:51:30 AM by xiaxiang »

#### ElpanovEvgeniy

• Water Moccasin
• Posts: 1544
• Moscow (Russia)
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #16 on: January 15, 2015, 04:40:37 AM »
Minor error
Code: [Select]
`(List:DuplicatesEq2 '(1.0 1.1 1.19 1.2 1.2 1.21 1.22 1.23 1.25 1.3 2.0 2.1 2.19 2.2 2.2 2.21 2.22 2.23 2.25 2.3) 0.05)-->((1.19 1.2 1.2 1.21 1.22 1.23 1.25) (2.19 2.2 2.2 2.21 2.22 2.23 2.25 [color=red]2.3[/color]))`

On my comp:
Code: [Select]
`  (equal 2.25 2.3 0.05);=>> T  (equal 2.15 2.2 0.05);=>> nil  (equal 2.05 2.1 0.05);=>> nil`
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#### ElpanovEvgeniy

• Water Moccasin
• Posts: 1544
• Moscow (Russia)
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #17 on: January 15, 2015, 04:43:26 AM »
my version for sorted list:
Code - Auto/Visual Lisp: [Select]
1. (defun f (l a b)
2.   (cond ((and (not l) (cdr b)) (list (reverse b)))
3.         ((not l) nil)
4.         ((equal (car l) (car b) a) (f (cdr l) a (cons (car l) b)))
5.         ((cdr b) (cons (reverse b) (f l a nil)))
6.         ((f (cdr l) a (list (car l))))
7.   )
8. )
test:
Code - Auto/Visual Lisp: [Select]
1. (f (vl-sort l '<=) a nil)
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#### xiaxiang

• Guest
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #18 on: January 15, 2015, 04:55:33 AM »
my version for sorted list:
Code - Auto/Visual Lisp: [Select]
1. (defun f (l a b)
2.   (cond ((and (not l) (cdr b)) (list (reverse b)))
3.         ((not l) nil)
4.         ((equal (car l) (car b) a) (f (cdr l) a (cons (car l) b)))
5.         ((cdr b) (cons (reverse b) (f l a nil)))
6.         ((f (cdr l) a (list (car l))))
7.   )
8. )
test:
Code - Auto/Visual Lisp: [Select]
1. (f (vl-sort l '<=) a nil)

What is "a" and "b"?

#### ElpanovEvgeniy

• Water Moccasin
• Posts: 1544
• Moscow (Russia)
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #19 on: January 15, 2015, 05:03:37 AM »
What is "a" and "b"?

Code: [Select]
`(f (vl-sort '(1.0 1.1 1.19 1.2 1.2 1.21 1.22 1.23 1.25 1.3 2.0 2.1 2.19 2.2 2.2 2.21 2.22 2.23 2.25 2.3)  '<=) 0.05 nil)`
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#### VovKa

• Swamp Rat
• Posts: 1369
• Ukraine
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #20 on: January 15, 2015, 05:49:00 AM »
On my comp:
Code: [Select]
`  (equal 2.25 2.3 0.05);=>> T  (equal 2.15 2.2 0.05);=>> nil  (equal 2.05 2.1 0.05);=>> nil`
but
Quote
(equal 2.25 (+ 2.25 0.05) 0.05);=>> T
(equal 2.15 (+ 2.15 0.05) 0.05);=>> T
(equal 2.05 (+ 2.05 0.05) 0.05);=>> T
damn nice surprise from autodesk programmers

#### Marc'Antonio Alessi

• Swamp Rat
• Posts: 1207
• Marco
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #21 on: January 15, 2015, 06:05:00 AM »
Sorry for the intrusion, but there is something I do not understand. If we, for example, stating that this function is reliable:
Code: [Select]
`;; Unique with Fuzz  -  Lee Mac;; Returns a list with all elements considered duplicate to;; a given tolerance removed.(defun LM:UniqueFuzz ( l f / x r )    (while l        (setq x (car l)              l (vl-remove-if (function (lambda ( y ) (equal x y f))) (cdr l))              r (cons x r)        )    )    (reverse r))`
Code: [Select]
`(LM:UniqueFuzz     '(1.0 1.1 1.19 1.2 1.21 1.22 1.23 1.25 1.3) 0.05)=>                  (1.0 1.1 1.19                    1.25 1.3)`So: (1.2 1.21 1.22 1.23) are duplicates? This is the required result?
Code: [Select]
`; 20150114 - 1.00 - only for test(defun ALE_List_FindDupesFuzz (In_Lst FuzFac / OutLst TmpLst NthVal Countr)    (setq OutLst (list (car In_Lst)) In_Lst (cdr In_Lst))    (foreach ForElm In_Lst      (if (vl-position ForElm OutLst)        OutLst        (progn          (setq Countr 0)          (while (and Countr (setq NthVal (nth Countr OutLst)))            (if (equal ForElm NthVal FuzFac)              (setq Countr nil)              (setq Countr (1+ Countr))            )          )          (if NthVal            (setq TmpLst (cons ForElm TmpLst))            (setq OutLst (cons ForElm OutLst))          )        )      )    )    (reverse TmpLst))(ALE_List_FindDupesFuzz '(1.0 1.1 1.19 1.2 1.21 1.22 1.23 1.25 1.3) 0.05)(1.2 1.21 1.22 1.23)`

#### xiaxiang

• Guest
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #22 on: January 15, 2015, 06:38:37 AM »
(1.19 1.2 1.21 1.22 1.23 1.25) are duplicate items in my case.The next step we will determine which value that was considered as duplicate should be reserved.

#### Marc'Antonio Alessi

• Swamp Rat
• Posts: 1207
• Marco
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #23 on: January 15, 2015, 09:10:48 AM »
(1.19 1.2 1.21 1.22 1.23 1.25) are duplicate items in my case.The next step we will determine which value that was considered as duplicate should be reserved.
Ok, this may be a foreach version:
(ALE_List_FindDupesFuzz '(1.0 1.1 1.19 1.2 1.21 1.22 1.23 1.25 1.3) 0.05)  => (1.19 1.2 1.21 1.22 1.23 1.25)
Code: [Select]
`; 20150115 - 1.03(defun ALE_List_FindDupesFuzz (In_Lst FuzFac / OutLst TmpLst NthVal Countr)  (setq OutLst (list (car In_Lst)) In_Lst (cdr In_Lst))  (foreach ForElm In_Lst    (if (vl-position ForElm OutLst)      (or (vl-position ForElm TmpLst) (setq TmpLst (cons ForElm TmpLst)))      (progn        (setq Countr 0)        (while (and Countr (setq NthVal (nth Countr OutLst)))          (if (equal ForElm NthVal FuzFac) (setq Countr nil) (setq Countr (1+ Countr)))        )        (or          Countr          (progn            (or  (vl-position NthVal TmpLst) (setq TmpLst (cons NthVal TmpLst)))            (and (vl-position NthVal OutLst) (setq OutLst (vl-remove NthVal OutLst)))          )        )        (if NthVal (setq TmpLst (cons ForElm TmpLst)) (setq OutLst (cons ForElm OutLst)))      )    )  )  (reverse TmpLst))`
« Last Edit: January 15, 2015, 12:00:15 PM by Marc'Antonio Alessi »

#### ronjonp

• Needs a day job
• Posts: 7327
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #24 on: January 15, 2015, 09:34:14 AM »
Minor error
Code: [Select]
`(List:DuplicatesEq2 '(1.0 1.1 1.19 1.2 1.2 1.21 1.22 1.23 1.25 1.3 2.0 2.1 2.19 2.2 2.2 2.21 2.22 2.23 2.25 2.3) 0.05)-->((1.19 1.2 1.2 1.21 1.22 1.23 1.25) (2.19 2.2 2.2 2.21 2.22 2.23 2.25 [color=red]2.3[/color]))`

On my comp:
Code: [Select]
`  (equal 2.25 2.3 0.05);=>> T  (equal 2.15 2.2 0.05);=>> nil  (equal 2.05 2.1 0.05);=>> nil`

Same here .. that's not cool.

Windows 10 x64 - AutoCAD /C3D 2020

Custom Build PC

#### Marc'Antonio Alessi

• Swamp Rat
• Posts: 1207
• Marco
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #25 on: January 15, 2015, 09:49:47 AM »
Minor error
Code: [Select]
`(List:DuplicatesEq2 '(1.0 1.1 1.19 1.2 1.2 1.21 1.22 1.23 1.25 1.3 2.0 2.1 2.19 2.2 2.2 2.21 2.22 2.23 2.25 2.3) 0.05)-->((1.19 1.2 1.2 1.21 1.22 1.23 1.25) (2.19 2.2 2.2 2.21 2.22 2.23 2.25 [color=red]2.3[/color]))`

On my comp:
Code: [Select]
`  (equal 2.25 2.3 0.05);=>> T  (equal 2.15 2.2 0.05);=>> nil  (equal 2.05 2.1 0.05);=>> nil`

Same here .. that's not cool.
Code: [Select]
`(equal 2.25 2.30 0.05)                ;=>> T(equal 2.25 2.30 0.049999999999999)   ;=>> nil(equal 2.25 2.30 0.0499999999999999)  ;=>> T(equal 2.15 2.2 0.05)                 ;=>> nil(equal 2.15 2.2 0.0500000000000001)   ;=>> nil(equal 2.15 2.2 0.050000000000001)    ;=>> T`

#### Marc'Antonio Alessi

• Swamp Rat
• Posts: 1207
• Marco
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #26 on: January 15, 2015, 11:59:35 AM »
there is still something wrong...
Code: [Select]
`(setq fuzz 0.05   alist '(3.0 1.0 1.1 1.19 1.2 1.21 1.22 3.0 3.0 3.0 3.0 3))=> (3.0 1.0 1.1 1.19 1.2 1.21 1.22 3.0 3.0 3.0 3.0 3)(ALE_List_FindDupesFuzz alist fuzz)  >>>  r.1.03=>  (1.19 1.2 1.21 1.22 3.0 3)(f (vl-sort alist  '<=) fuzz nil)=> ((1.19 1.2 1.21 1.22) (3 3.0 3.0 3.0 3.0 3.0))(List:DuplicatesEq alist fuzz)=> (3.0 1.19 1.2 1.21 1.22 3.0 3.0 3.0 3.0 3)`

#### roy_043

• Water Moccasin
• Posts: 1876
##### Re: {Challenge}How to find the duplicate items in the list
« Reply #27 on: January 15, 2015, 01:10:37 PM »
On my comp:
Code: [Select]
`  (equal 2.25 2.3 0.05);=>> T  (equal 2.15 2.2 0.05);=>> nil  (equal 2.05 2.1 0.05);=>> nil`
but
Quote
(equal 2.25 (+ 2.25 0.05) 0.05);=>> T
(equal 2.15 (+ 2.15 0.05) 0.05);=>> T
(equal 2.05 (+ 2.05 0.05) 0.05);=>> T
damn nice surprise from autodesk programmers
This problem is caused by the fact that the 64 bit binary floating point format cannot be exactly matched to the decimal format.

#### xiaxiang

• Guest
##### Re: {Resolved}How to find the duplicate items in the list
« Reply #28 on: January 19, 2015, 10:05:16 PM »
Thank you all !

#### Marc'Antonio Alessi

• Swamp Rat
• Posts: 1207
• Marco
##### Re: {Resolved}How to find the duplicate items in the list
« Reply #29 on: January 20, 2015, 08:47:01 AM »
IMHO, I think to properly terminate this thread need to distinguish three types of "ListDupesFuzz" functions:
Code: [Select]
`=> fuzz 0.05Remove Uniques: (1.0 1.1 1.19 1.2 1.21 1.22 1.23 1.25 1.3 3.0 3.0 3.0)              =>(1.2              1.21 1.22 1.23)Show     Dupes: (1.0 1.1 1.19 1.2 1.21 1.22 1.23 1.25 1.3 3.0 3.0 3.0)             => (        1.19 1.2 1.21 1.22 1.23 1.25     3.0)Show All Dupes: (1.0 1.1 1.19 1.2 1.21 1.22 1.23 1.25 1.3 3.0 3.0 3.0)             => (        1.19 1.2 1.21 1.22 1.23 1.25     3.0 3.0 3.0)`