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Questions tagged [sequences]

A sequence is any type for which there is a bijective relation between the integers `0..n` and the elements of the sequence, and the elements may be accessed in the order `0..n`, where `n` is the number of elements in the sequence.

A sequence is any type for which there is a bijective relation between the integers 0..n and the elements of the sequence, and the elements may be accessed in the order 0..n, where n is the number of elements in the sequence.

A sequence may be infinite, in which case, the relation is with the open range 0....

538 questions
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How should I implement an atomic sequence in Perl?

I have the following requirements: The sequence is unique to a host (no shared incrementing is necessary) The sequence must be monotonically increasing. The sequence must be persistent across processes. Incrementing the sequence must be atomic in…
Chris R
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Can anyone provide a more pythonic way of generating the morris sequence?

I'm trying to generate the morris sequence in python. My current solution is below, but I feel like I just wrote c in python. Can anyone provide a more pythonic solution? def morris(x): a = ['1', '11'] yield a[0] yield a[1] while…
rz.
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What is the name of such diagrams?

I would like to generate diagrams similar to this, but I don't have a clue what to look for.
nowox
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Create long data format based on strings of sequences defined by colons and concatenated vectors

I have data where the IDs of each observation are numbers stored as sequences usually in the form of X:Y, but sometimes concatenated lists. I would like to tidy the data so each observation has its own row so that I can then use a join function to…
G_T
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How does Julia interpret 10:1?

I'm an expat from focusing on R for a long time where the : (colon) operator creates integer sequences from the first to the second argument: 1:10 # [1] 1 2 3 4 5 6 7 8 9 10 10:1 # [1] 10 9 8 7 6 5 4 3 2 1 Noticing that this…
MichaelChirico
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Postgres 'if not exists' fails because the sequence exists

I have several counters in an application I am building, as am trying to get them to be dynamically created by the application as required. For a simplistic example, if someone types a word into a script it should return the number of times that…
Shadow
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Repeating vectors in Clojure

I am a Clojure newbie. I am trying to get two copies of a vector of card suits. The non-DRY way that I can come up with is (def suits [:clubs :diamonds :hearts :spades]) (def two-times (concat suits suits)) There must be a more functional way (even…
Ralph
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What's the alternate character combination for the double quote character in C/C++?

I've not had the Kernighan and Ritchie C reference in years, but I remember that there was a page in there that talked about how to enter characters that were unavailable to you. (WAY back in the day, some keyboards lacked characters like ", ~,…
Sniggerfardimungus
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How to check if a sequence exists in my schema?

Is there a way to retrieve all the sequences defined in an existing oracle-sql db schema? Ideally I would like to use something like this: SELECT * FROM all_sequences WHERE owner = 'me'; which apparently doesn't work.
Christos
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Reset A Sequence

I've read several posts about the TSQL Identity Bug and have been playing around with using SEQUENCE. However, I'm curious about resetting the SEQUENCE on the ID value in a table. For an example: CREATE SEQUENCE Inc AS INT START WITH 1 …
Question3CPO
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Additive Sequence Algorithm

I am practicing algorithms for interviews and came across this question on Career Cup and SO An additive sequence number is which when splitted in two different number forms additive seq. Ex: 1235 (split it 1,2,3,5) Ex: 12122436(split…
Vbp
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How to generate for loop number sequence by using variable names in bash?

Could anybody explain how can I use variable names in bash for loop to generate a sequence of numbers? for year in {1990..1997} do echo ${year} done Results: 1990 1991 1992 1993 1994 1995 1996 1997 However year_start=1990 year_end=1997 for year…
wiswit
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Clojure sub-sequence position in sequence

Does Clojure provide any builtin way to find the position of a sub-sequence in a given sequence?
Tudor Vintilescu
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Creating a sequence for a varchar2 field in Oracle

I want to create a sequence for this varchar. It would have been easier had it been a number instead of varchar. In that case, I could do seq_no := seq_no + 1; But what can I do when I want to store next value in column as A0000002, when the…
ykombinator
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increasing decreasing sequence

A sequence in which the value of elements first decrease and then increase is called V- Sequence. In a valid V-Sequence there should be at least one element in the decreasing and at least one element in the increasing arm. For example, "5 3 1 9 17…
simplest_coder
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