Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with gathering
Search options answers only
not deleted
user 81335
Questions on gathering, grouping or clustering data based on certain criteria. This is to be used with primary tags such as list-manipulation, string-manipulation or similar tags, with the primary tag indicating the specific use case.
1
vote
GatherBy[list, f] except with sublists ordered by f's value
SeedRandom[1]
list = RandomSample@Range[10]
manyLists = Table[RandomSample@list, 10]
$$\left(
\begin{array}{cccccccccc}
7 & 2 & 9 & 1 & 8 & 3 & 10 & 4 & 6 & 5 \\
3 & 6 & 9 & 4 & 2 & 5 & 7 & 8 & 10 …
- 59.4k
6
votes
Accepted
Strange behavior of Gather with DateObject
Compare the outputs of:
Gather[l, #1 === #2 &]
Gather[l, #1 == #2 &]
The default test is SameQ that translates to #1===#2&and this is what you are seeing. Equal does not mean the same. There is a d …
- 59.4k
1
vote
Grouping lists by their first elements and deleting some groups
I added an entry to the data and made it visible with a Red x to test my solution.
Clear["Global`*"];
list = {{1, 4, 1, -3}, {1, 4, 1, -1}, {1, 4, 1, Style[x, Red]}, {1, 4,
2, -2}, {1, 5, 2, -4}, …
- 59.4k
5
votes
Merging and keeping only the sublists whose first two elements are equal
Clear["Global`*"];
list = {{-9, 3, 2}, {-9, 3, 8}, {-9, 4, 3}, {-9, 4, 4}, {-7, 2,
2}, {-7, 2, 10}, {-7, 3, 4}, {-5, 1, 16}, {-5, 2, 4}, {-3, 1,
4}, {-3, 1, 6}, {3, 1, -14}, {3, 2, -8}, {3, …
- 59.4k