How to use Select for a specific nested list level

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4
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I would like to parse every sublist of a nested list and select only those elements that have a certain length, i.e., smaller than 10 elements while maintaining the list structure. Is there any quick trick that makes it work ?

Matrix = 
 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,20,19,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,5,PoP1,6,24,28,18,PoP2,17,27,13,14,D1,
 O1,2,1,21,22,24,26,12,11,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,10,9,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,8,7,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,1,2,22,21,23,25,11,12,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,14,D1
 
 

the result needs to be :

 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1
 
 

Appreciated any help,

list-manipulation filtering

share|improve this question

edited 38 mins ago

Carl Woll

63.6k282165

asked 1 hour ago

Besi

453

add a comment | 

up vote
4
down vote

favorite

I would like to parse every sublist of a nested list and select only those elements that have a certain length, i.e., smaller than 10 elements while maintaining the list structure. Is there any quick trick that makes it work ?

Matrix = 
 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,20,19,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,5,PoP1,6,24,28,18,PoP2,17,27,13,14,D1,
 O1,2,1,21,22,24,26,12,11,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,10,9,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,8,7,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,1,2,22,21,23,25,11,12,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,14,D1
 
 

the result needs to be :

 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1
 
 

Appreciated any help,

list-manipulation filtering

share|improve this question

edited 38 mins ago

Carl Woll

63.6k282165

asked 1 hour ago

Besi

453

add a comment | 

up vote
4
down vote

favorite

up vote
4
down vote

favorite

I would like to parse every sublist of a nested list and select only those elements that have a certain length, i.e., smaller than 10 elements while maintaining the list structure. Is there any quick trick that makes it work ?

Matrix = 
 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,20,19,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,5,PoP1,6,24,28,18,PoP2,17,27,13,14,D1,
 O1,2,1,21,22,24,26,12,11,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,10,9,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,8,7,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,1,2,22,21,23,25,11,12,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,14,D1
 
 

the result needs to be :

 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1
 
 

Appreciated any help,

list-manipulation filtering

share|improve this question

edited 38 mins ago

Carl Woll

63.6k282165

asked 1 hour ago

Besi

453

I would like to parse every sublist of a nested list and select only those elements that have a certain length, i.e., smaller than 10 elements while maintaining the list structure. Is there any quick trick that makes it work ?

Matrix = 
 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,20,19,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,16,15,27,13,14,D1,
 O1,1,2,22,21,23,5,PoP1,6,24,28,18,PoP2,17,27,13,14,D1,
 O1,2,1,21,22,24,26,12,11,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,10,9,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,2,1,21,22,24,26,8,7,25,23,27,17,PoP2,18,28,14,13,D1,
 O1,1,2,22,21,23,25,11,12,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,9,10,26,24,28,18,PoP2,17,27,13,14,D1,
 O1,1,2,22,21,23,25,7,8,26,24,28,18,PoP2,17,27,13,14,D1
 
 

the result needs to be :

 
 
 O1,2,22,24,28,14,D1,
 O1,1,21,23,27,13,D1,
 O1,2,22,24,28,27,13,D1,
 O1,2,22,24,28,14,13,D1,
 O1,2,22,24,23,27,13,D1,
 O1,2,22,21,23,27,13,D1,
 O1,2,1,21,23,27,13,D1,
 O1,1,21,23,27,28,14,D1,
 O1,1,21,23,27,13,14,D1,
 O1,1,21,23,24,28,14,D1,
 O1,1,21,22,24,28,14,D1,
 O1,1,2,22,24,28,14,D1,
 O1,2,22,24,28,27,13,14,D1,
 O1,2,22,24,23,27,28,14,D1
 
 

Appreciated any help,

list-manipulation filtering

list-manipulation filtering

share|improve this question

edited 38 mins ago

Carl Woll

63.6k282165

asked 1 hour ago

Besi

453

share|improve this question

edited 38 mins ago

Carl Woll

63.6k282165

asked 1 hour ago

Besi

453

share|improve this question

share|improve this question

edited 38 mins ago

Carl Woll

63.6k282165

edited 38 mins ago

Carl Woll

63.6k282165

edited 38 mins ago

Carl Woll

63.6k282165

63.6k282165

asked 1 hour ago

Besi

453

asked 1 hour ago

Besi

453

asked 1 hour ago

Besi

453

453

add a comment | 

add a comment | 

2 Answers
2

active

oldest

votes

up vote
4
down vote



accepted

Map[Select[Length[#] < 10 &], Matrix, 2]

share|improve this answer

answered 1 hour ago

Henrik Schumacher

43.3k263129

add a comment | 

up vote
2
down vote

I would again use DeleteCases just like in my answer to your last question Filtering nested lists while maintaining the list level:

DeleteCases[Matrix, s_List?(Length[#]>=10&), -2]

O1, 2, 22, 24, 28, 14, D1, O1, 1, 21, 23, 27, 13, D1, O1, 2, 22, 24,
28, 27, 13, D1, O1, 2, 22, 24, 28, 14, 13, D1, O1, 2, 22, 24, 23, 27,
13, D1, O1, 2, 22, 21, 23, 27, 13, D1, O1, 2, 1, 21, 23, 27, 13,
D1, O1, 1, 21, 23, 27, 28, 14, D1, O1, 1, 21, 23, 27, 13, 14,
D1, O1, 1, 21, 23, 24, 28, 14, D1, O1, 1, 21, 22, 24, 28, 14,
D1, O1, 1, 2, 22, 24, 28, 14, D1, O1, 2, 22, 24, 28, 27, 13, 14,
D1, O1, 2, 22, 24, 23, 27, 28, 14, D1

share|improve this answer

answered 40 mins ago

Carl Woll

63.6k282165

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Not sure why, but applying this does not work correctly. Whereas, the answer given by Mr. Schumacher works. Thanks anyway.
  – Besi
  22 mins ago
  
  

  
  
  
  

add a comment | 

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
4
down vote



accepted

Map[Select[Length[#] < 10 &], Matrix, 2]

share|improve this answer

answered 1 hour ago

Henrik Schumacher

43.3k263129

add a comment | 

up vote
4
down vote



accepted

Map[Select[Length[#] < 10 &], Matrix, 2]

share|improve this answer

answered 1 hour ago

Henrik Schumacher

43.3k263129

add a comment | 

up vote
4
down vote



accepted

up vote
4
down vote



accepted

Map[Select[Length[#] < 10 &], Matrix, 2]

share|improve this answer

answered 1 hour ago

Henrik Schumacher

43.3k263129

Map[Select[Length[#] < 10 &], Matrix, 2]

share|improve this answer

answered 1 hour ago

Henrik Schumacher

43.3k263129

share|improve this answer

share|improve this answer

answered 1 hour ago

Henrik Schumacher

43.3k263129

answered 1 hour ago

Henrik Schumacher

43.3k263129

answered 1 hour ago

Henrik Schumacher

43.3k263129

43.3k263129

add a comment | 

add a comment | 

up vote
2
down vote

I would again use DeleteCases just like in my answer to your last question Filtering nested lists while maintaining the list level:

DeleteCases[Matrix, s_List?(Length[#]>=10&), -2]

O1, 2, 22, 24, 28, 14, D1, O1, 1, 21, 23, 27, 13, D1, O1, 2, 22, 24,
28, 27, 13, D1, O1, 2, 22, 24, 28, 14, 13, D1, O1, 2, 22, 24, 23, 27,
13, D1, O1, 2, 22, 21, 23, 27, 13, D1, O1, 2, 1, 21, 23, 27, 13,
D1, O1, 1, 21, 23, 27, 28, 14, D1, O1, 1, 21, 23, 27, 13, 14,
D1, O1, 1, 21, 23, 24, 28, 14, D1, O1, 1, 21, 22, 24, 28, 14,
D1, O1, 1, 2, 22, 24, 28, 14, D1, O1, 2, 22, 24, 28, 27, 13, 14,
D1, O1, 2, 22, 24, 23, 27, 28, 14, D1

share|improve this answer

answered 40 mins ago

Carl Woll

63.6k282165

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Not sure why, but applying this does not work correctly. Whereas, the answer given by Mr. Schumacher works. Thanks anyway.
  – Besi
  22 mins ago
  
  

  
  
  
  

add a comment | 

up vote
2
down vote

I would again use DeleteCases just like in my answer to your last question Filtering nested lists while maintaining the list level:

DeleteCases[Matrix, s_List?(Length[#]>=10&), -2]

O1, 2, 22, 24, 28, 14, D1, O1, 1, 21, 23, 27, 13, D1, O1, 2, 22, 24,
28, 27, 13, D1, O1, 2, 22, 24, 28, 14, 13, D1, O1, 2, 22, 24, 23, 27,
13, D1, O1, 2, 22, 21, 23, 27, 13, D1, O1, 2, 1, 21, 23, 27, 13,
D1, O1, 1, 21, 23, 27, 28, 14, D1, O1, 1, 21, 23, 27, 13, 14,
D1, O1, 1, 21, 23, 24, 28, 14, D1, O1, 1, 21, 22, 24, 28, 14,
D1, O1, 1, 2, 22, 24, 28, 14, D1, O1, 2, 22, 24, 28, 27, 13, 14,
D1, O1, 2, 22, 24, 23, 27, 28, 14, D1

share|improve this answer

answered 40 mins ago

Carl Woll

63.6k282165

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Not sure why, but applying this does not work correctly. Whereas, the answer given by Mr. Schumacher works. Thanks anyway.
  – Besi
  22 mins ago
  
  

  
  
  
  

add a comment | 

up vote
2
down vote

up vote
2
down vote

I would again use DeleteCases just like in my answer to your last question Filtering nested lists while maintaining the list level:

DeleteCases[Matrix, s_List?(Length[#]>=10&), -2]

O1, 2, 22, 24, 28, 14, D1, O1, 1, 21, 23, 27, 13, D1, O1, 2, 22, 24,
28, 27, 13, D1, O1, 2, 22, 24, 28, 14, 13, D1, O1, 2, 22, 24, 23, 27,
13, D1, O1, 2, 22, 21, 23, 27, 13, D1, O1, 2, 1, 21, 23, 27, 13,
D1, O1, 1, 21, 23, 27, 28, 14, D1, O1, 1, 21, 23, 27, 13, 14,
D1, O1, 1, 21, 23, 24, 28, 14, D1, O1, 1, 21, 22, 24, 28, 14,
D1, O1, 1, 2, 22, 24, 28, 14, D1, O1, 2, 22, 24, 28, 27, 13, 14,
D1, O1, 2, 22, 24, 23, 27, 28, 14, D1

share|improve this answer

answered 40 mins ago

Carl Woll

63.6k282165

I would again use DeleteCases just like in my answer to your last question Filtering nested lists while maintaining the list level:

DeleteCases[Matrix, s_List?(Length[#]>=10&), -2]

O1, 2, 22, 24, 28, 14, D1, O1, 1, 21, 23, 27, 13, D1, O1, 2, 22, 24,
28, 27, 13, D1, O1, 2, 22, 24, 28, 14, 13, D1, O1, 2, 22, 24, 23, 27,
13, D1, O1, 2, 22, 21, 23, 27, 13, D1, O1, 2, 1, 21, 23, 27, 13,
D1, O1, 1, 21, 23, 27, 28, 14, D1, O1, 1, 21, 23, 27, 13, 14,
D1, O1, 1, 21, 23, 24, 28, 14, D1, O1, 1, 21, 22, 24, 28, 14,
D1, O1, 1, 2, 22, 24, 28, 14, D1, O1, 2, 22, 24, 28, 27, 13, 14,
D1, O1, 2, 22, 24, 23, 27, 28, 14, D1

share|improve this answer

answered 40 mins ago

Carl Woll

63.6k282165

share|improve this answer

share|improve this answer

answered 40 mins ago

Carl Woll

63.6k282165

answered 40 mins ago

Carl Woll

63.6k282165

answered 40 mins ago

Carl Woll

63.6k282165

63.6k282165

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Not sure why, but applying this does not work correctly. Whereas, the answer given by Mr. Schumacher works. Thanks anyway.
  – Besi
  22 mins ago
  
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Not sure why, but applying this does not work correctly. Whereas, the answer given by Mr. Schumacher works. Thanks anyway.
  – Besi
  22 mins ago
  
  

  
  
  
  

Not sure why, but applying this does not work correctly. Whereas, the answer given by Mr. Schumacher works. Thanks anyway.
– Besi
22 mins ago

Not sure why, but applying this does not work correctly. Whereas, the answer given by Mr. Schumacher works. Thanks anyway.
– Besi
22 mins ago

add a comment | 

 

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