WebDrop Drop. gives list with its first n elements dropped. gives list with its last n elements dropped. gives list with its n element dropped. gives list with elements m through n dropped. gives list with elements m through n in steps of s dropped. Drop [ list, seq1, seq2, …] gives a nested list in which elements specified by seq i have been ... WebOct 11, 2013 · NOTE: merged from a later duplicate question Update Ok, since this became another shootout, here is my answer to the challenge: lremoveFaster [lst_List]:= Replace [lst, {l_List} :> l, {0, Infinity}] my benchmarks show that it is the fastest so far. Initial solution Here is a recursive version:
Improve running speed for DeleteDuplicates - Mathematica Stack …
WebThis probably doesn't matter if you consider numbers this close to be duplicates, but should you want the unchanged numbers you could use GatherBy and get performance not far distant. First /@ GatherBy[m, Round[#, 10^-6] &] Version 10.0 introduced DeleteDuplicatesBy which works similarly to the GatherBy method; it has the following … Webdeletes parts at several positions. Delete [ pos] represents an operator form of Delete that can be applied to an expression. Details Examples open all Basic Examples (5) Delete … front attach dog harness
How to efficiently find positions of duplicates?
WebJan 16, 2012 · 15. If you need to remove it from an existing list, you can use. DeleteCases [list, Null] or. list /. Null -> Sequence [] (a bit more advanced). Regarding your Table example above, first note that the second comma in If is unnecessary (and is even highlighted in pink): list = Table [If [i < 3, i], {i, 5}] WebAug 5, 2016 · As a dummy, let list be defined as: a := RandomInteger [10^10, 30]; list = Table [a, 2*^6]; Using Catenate and DeleteDuplicates on list consumes a lot of memory: … WebDeleteDuplicates also works on associations, removing entries whose values duplicate those earlier in the association. DeleteDuplicates never reorders elements, but only removes them. DeleteDuplicates [list] is equivalent to DeleteDuplicates [list, SameQ]. Select[list, crit] picks out all elements ei of list for which crit[ei] is True. Select[list, … DeleteCases[expr, pattern] removes all elements of expr that match pattern. … Split[list] splits list into sublists consisting of runs of identical elements. Split[list, test] … Partition[list, n] partitions list into nonoverlapping sublists of length n. … Union[list1, list2, ...] gives a sorted list of all the distinct elements that appear in any … Wolfram Science. Technology-enabling science of the computational universe. … Lists are central constructs in the Wolfram Language, used to represent … Gather[list] gathers the elements of list into sublists of identical elements. … front attachment