Linked Questions

4
votes
1answer
263 views

Delete all French stopwords [duplicate]

I have a list of french stopwords: ...
1
vote
4answers
114 views

Seek a quick way to bring standard order back to original after Complement [duplicate]

the Complement gives result in standard order. But that's not what I want. I want it to keep the original order. say I have a list ...
1
vote
0answers
328 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 (...
1
vote
1answer
133 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 ...
1
vote
0answers
84 views

Removing every member of a list from another list [duplicate]

I have a list of lists A={{1,2},{3,6},{7,8},{5,0}}, and another list of lists B={{1,2},{5,0}}. If any list in B is also in A, I want to remove them from A. E.g.,Taking {1,2} and {5,0} out of A to get ...
38
votes
9answers
5k 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}
18
votes
8answers
1k 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}} -> ...
21
votes
7answers
1k 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 ...
10
votes
5answers
822 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 ...
3
votes
3answers
432 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: ...
10
votes
2answers
486 views

Complement on pre-sorted lists

Is there any way to instruct Complement to skip the sorting part? If the answer is no (likely), the next question would be: how can I remove from a sorted list ...
2
votes
2answers
238 views

How to exclude numbers in a series and still plot the graph? [duplicate]

I want to plot this: $\displaystyle\sum_{n=-{10}\atop n\ne \pm 1}^{10} \dfrac {4i(-1)^{n}n}{(n^2 - 1)^2}e^{inx}$ but have no idea how I can exclude the cases for when $ n = \pm 1 $. I don't wish to ...
2
votes
1answer
101 views

How to use Select to exclude a single element which I can control? [duplicate]

I have code which inserts an expression into lists that I need to remove. I can insert anything I want, a string, variable, or number, into the lists. Suppose I insert the number 13 as my blacklisted ...
1
vote
1answer
49 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 ...