# Questions tagged [sequence]

Questions on specifying order in and splicing of lists, including use of Mathematica Sequence objects.

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### Performance problems in new Sequence functions

The new-in-10.1 Sequence* family of functions should provide newly optimized methods for handling sequence problems. Happily in some cases they do! For example ...
437 views

### Using Sequence to delete a part of an expression

I thought that assigning Sequence[] to a part of an expression is an effective way to remove it. For example, the following code yields ...
1k views

### What happens when you divide by ##?

I've been playing around with sequences a bit. In particular with using ## with unary and binary operators. Let's start simple, the following all make some kind of ...
623 views

### How do I test if a variable represents a sequence?

I created a variable that represents a sequence: mySeq = Sequence[1, 2, 3]; I wanted to use that variable as an argument for some functions. But I got in trouble....
1k views

### How can I return a Sequence?

Recently I had the need to redefine a certain symbol in my init.m so it would be automatically omitted from any lists it appears in. I decided to redefine it to an empty sequence, e.g. ...
211 views

### Pattern matching with List and Optional

Bug introduced in 8.0.4 or earlier and persists through 11.1.1 Thank you for bringing this to our attention. I have filed a report with our developers. Why does this ...
459 views

### Positions of elements in the initial flattened list in a split list

Say, we have a list: m1 = {2, 2, 7, 0, 7, 7, 2, 2, 2} It can be split easily: ...
178 views

### The use of SlotSequence in If[#1 > #2, ##] &

The below function when applied to a list of two elements, will output the maximum between the two: If[#1 > #2, ##] & For example: ...
321 views

### Empty Blank regression in v10.1

Bug introduced in 10.1 and fixed in 10.2.0 In v10.1.0.0 on Linux, when Blank[] is used in Alternatives with pattern that can ...
687 views

### Counting subsequences (i.e., patterns) within a list?

I would like to count the number of subsequences in list. Say I have data given by: data = {1, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1}; I would like to count the number ...
512 views

### Repeating Digits

I have written ...
459 views

### How to implement symbolic Ramanujan's summation in Mathematica?

How to implement Ramanujan's summation in symbolic form in Mathematica? For instance, I want as input the function $f(x)=x$, as output $-1/12$, as input $f(x)=1/x$, as output $\gamma$ (Euler's ...
694 views

### Is it possible to find a limit of a sequence given by its recurrence relation?

I need to calculate a limit of a sequence given by its recurrence relation. I tried the following: ...
502 views

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460 views

### How can I tally continuous sequences in a list?

I have a stream of data like this: 0001100111100000111111001110000001111111111000000111000111110000... (I can represent them as a list, like in {0,0,0,1,1,...}, ...
381 views

### How to find a recurrence relation for a sequence?

I have a sequence given by an explicit formula for n-th term: ...
300 views

### FindSequenceFunction for sum of hypergeometric terms?

The built-in function FindSequenceFunction is quite good at recognizing hypergeometric terms, i.e. terms $c_k$ for which $c_{k+1}/c_k$ is a rational function of $k$....
444 views

### Match a sequence of integers

I would to match a pattern p1 = 0,0,1,0,0 to the elements in listA. The elements are a boolean sequence that may look like this ...
110 views

### Are there different Method options that can be used with FindSequenceFunction?

The help page states that Method is an option to use with FindSequenceFunction, but I don't find any further information. (There ...
152 views

### Find subsequence A in sequence B A007908 - OEIS

I have sequence A as A007908 - OEIS and pattern B which is a sub-sequence of that sequence A. I need to find index of first occurrence of the given pattern. For example pattern ..1010... I've looked ...
373 views

### Turning arguments into exponents

I'd like to replace every instance of L[stuff], e.g., L[-1,-2,-2] in an expression with ...
102 views

### An unexpected match when using Condition, Optional and passing a Sequence

Mathematica is behaving in an expected way when passing a parameter with an Optional and a Sequence. Here is an example: ...
2k views

### How to find a recurrence relation for a numerical sequence?

This question was inspired by Vladimir Reshetnikov's question (How to find a recurrence relation for a sequence?): Given a finite sequence of numbers, how can we find in MMA a recurrence relation ...
61 views

### How to set up patterns when using SequenceSplit

Given a list lst={0,0,0,0,0,"A1",0,0,0,"B2",0,0,"C3","D4","E5",0,0,0,"F6"} How to split it as ...
136 views

### How to find the length of an indefinitely repeated sequence in a list

Here, I am not looking for simply a repeated element, but an indefinitely repeated sequence. For example, if I have the list ...
235 views

### Find the domain in which a sequence converges

I seem to have a lot of problems in the format of: Given the sequence $a_n=\frac{n^\alpha+1}{2n^8+5}$, for $\alpha > 0$, find the values of $\alpha$ such that the sequence converges. However, I ...
81 views

### SimilarityRules for SequenceAlignment of two lists

I am trying to use the SimilarityRules option of SequenceAlignment to customize its output. This works perfectly for strings, ...
437 views

137 views

### Taking a long time to produce output

In the following, I want to know b[1000], but it is taking a very long time even for b[30]. Please help ...
62 views

### FindGeneratingFunction gives up too easily [closed]

I am trying to automatically find a generating function from the coefficients of a simple rational function using Mathematica's FindGeneratingFunction: ...
86 views

### When does Slot evaluate?

I looked up the related answers, it must have to do with the scope. Toy example similar to mine in structure: ...