Linked Questions
20 questions linked to/from How to delete elements from list1 appearing in list2?
5
votes
4
answers
834
views
Removing certain numbers from a list
If I have a list of numbers {1, 2, 4, 70, 11, 20, 56, 79}, is there a way to remove the list {2, 4, 56} from that list?
In my ...
- 9,808
8
votes
5
answers
830
views
Complement[] changes order of elements?
Consider this example:
Complement[{a, y, c, d, e}, {a, c}, {d}]
(*{e, y}*)
However, I was expecting the result to be:
...
- 23.8k
13
votes
8
answers
1k
views
Counting the population of integers
Suppose that myData is a list of sublists. Each sublist has a length of one or greater and contains any number of replicates of the integers 1, 2, 3, and 4. I ...
- 23.5k
24
votes
10
answers
2k
views
How do I obtain an intersection of two or more list of lists conditioned on the first element of each sub-list?
Given two lists like
list1 = {{1, 1}, {2, 4}, {3, 9}, {4, 16}};
list2 = {{2, 6}, {3, 9}, {4, 12}, {5, 15}};
I would like to produce an output like
...
- 18.2k
39
votes
11
answers
6k
views
Removing elements from a list which appear in another list
There are two lists {a, b, c, a, d, a, e} and {a, c, a}.
I need to remove those elements from the first list
which appears in a second list, to get {b, d, a, e}
- 69.5k
12
votes
7
answers
657
views
How to use Intersection[] but keep the original list order?
I want to keep the original order of l1:
...
- 53.6k
22
votes
10
answers
2k
views
How do I delete all items that occur more than once?
DeleteDuplicates works fine but leaves a single copy of the duplicated item. I need to remove all items that occur more than once i.e. {{1,2},{1,2},{3,4}} -> ...
- 69.5k
2
votes
1
answer
123
views
4
votes
2
answers
123
views
Unexpected behaviour of Condition with Cases/MatchQ?
When using the unsorted version of Complement in this question I met the following unexpected result,
...
- 28k
3
votes
3
answers
226
views
Dropping list elements that are members of other lists [closed]
I have a set:
$$A=\{\{1,2,3\},\{1,3,2\},\{2,1,3\},\{2,3,1\},\{3,1,2\},\{3,2,1\}\}$$
I want to drop elements found in sets B and C from A.
$$B=\{\{1,3,2\},\{2,1,3\}\}$$
$$C=\{\{3,1,2\},\{3,2,1\}\}$$
...
- 53.6k
3
votes
1
answer
71
views
Removing elements from nested list [duplicate]
I would like to remove the element of A1 from the list B1:
How I can do that?
Thank you!
A1= {{5, 6}, {4, 5}, {5, 4}}
...
- 501
4
votes
1
answer
361
views
2
votes
0
answers
795
views
Subtract Elements of two Lists [duplicate]
I have two Lists:
L = {1,2,3,4,5}
and K = {1,4}.
I would like to delete the elements of K (...
- 236k
1
vote
1
answer
317
views
What is the fastest way to delete multiple entries from a list? [duplicate]
Mathematica allows Deleting multiple objects from a list given their position. However, if I don't know their positions (finding their positions in the list is too costly if the list is long), how can ...
- 3,190
1
vote
1
answer
68
views
how to substract two tuples selections
i have two tuples select done with modulo on a range {-1,1} :
Select[Tuples[Range[-1, 1], 3], Mod[Total[#], 1] == 0 &]
and
...
- 4,225