Questions tagged [list-manipulation]

Questions on the manipulation of List objects in Mathematica, and the functions used for these manipulations.

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Method of assigning a number to the number of attempts that have appeared from it, with the first attempt appearing as number 1

I want to assign the first trial that appears as number 1 and the number of trials that appear from there as elements of the list, plus a number. At first, The following ...
hare's user avatar
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1 answer
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Assigning flag to the end of a collection of series

I have a large number of series(in the form of Rules) and want to assign flag at the highest order of each of the rules. What I mean, is following. Take the list of ...
Tanmoy Pati's user avatar
2 votes
1 answer
85 views

How can I determine the cycle lengths in a directed graph?

I have a directed graph: a = {{0, 1, 0, 0}, {0, 0, 1, 0}, {1, 0, 0, 1}, {1, 0, 0, 0}}; AdjacencyGraph[a] I want to determine the cycle lengths in the directed ...
geoffrey's user avatar
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Making some powers of variables inside the function : $X * \alpha^{m} *\beta^{n} f[A[x,y]] \Rightarrow X f[\alpha^{m}\beta^{n} A[x,y]]$

Suppose I have a function of the form $ a_1 a_2 \cdots a_n b_1 \cdots b_m \cdots f[L[x,y]]$. I want to make some particular letters and their power inside the bracket. i.e., I want the letter $\alpha,...
phy_math's user avatar
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The Value is not Updated in the list/table [closed]

I have following data groupedTerms3rdcycle = GroupBy[term3rdcyclelist, Most -> Last]; where term3rdcyclelist is the list. I ...
j.doe's user avatar
  • 123
3 votes
2 answers
130 views

Taylor approximation of integrals

I have BVP as in the picture and I want to solve it numerically by method given as follow. In the original paper, it is motioned that first iteration is computed and other are computed with Taylor ...
Junaid Ahmad's user avatar
2 votes
3 answers
171 views

Manipulate list of equations

I have a list of equations: eqns={a/b==c,d/e==f,...,x/y==z} Now I want to muliply each of the equations with corresponding denominator, so that the result is: <...
Zorg's user avatar
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5 votes
3 answers
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How to add a column to a dataset made up of an association of associations?

A dataset can be created in at least two ways: first, from a list of associations, second, from an association of associations (I know that it is also possible to create it as a list of list and an ...
Emerson Villafuerte's user avatar
7 votes
7 answers
422 views

Accumulated instance count of each list element

Given a list with repeated elements, for example: list = {m, i, s, s, i, s, s, i, p, p, i} I'd like to determine, for each position in the list, how many times the ...
thecommexokid's user avatar
4 votes
3 answers
633 views

How to remove a high accuracy numerical number from a list?

My numerical calculation gives a list of numbers list = {-0.36, 0.2499999999999992, -0.21, 0.36, 0.36}, I want to delete 0.25 ...
MMA13's user avatar
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Calculation hangs when called an own function from own loaded package. Debug output shows strange things

I created a package a long time ago and it was working, but in the versions 13.2 13.3 an old created function hangs when called. If I evaluate the same function from a cell manually and then call, it ...
Stiv Zhops's user avatar
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40 views

Matrix Dimension Changes [closed]

I am trying to run the following code: ...
Lelouch's user avatar
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1 answer
42 views

Neglecting coefficients of a given list

Suppose I have some complicated expressions, I want to extract some terms with $\{a_1, \cdots, a_n\}$ out of the complicated expressions without considering coefficients. For example, here is my trial....
phy_math's user avatar
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3 votes
2 answers
116 views

How do I create a list of matrices based on lists I have?

Okay, so let's say I have these lists and a number a = {1, 2, 3}; b = {4, 5, 6}; And now I want to create 3 matrices that each look like this ...
Seigel's user avatar
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12 votes
6 answers
2k views

The Battleship game: Identify objects within a matrix

Toy data ...
eldo's user avatar
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7 votes
6 answers
556 views

Rearrange triple sublists

Given a set of triple lists (all contain element 9!) tripel = {{5, 10, 9}, {4, 9, 3}, {3, 9, 8}, {4, 5, 9}, {9, 10, 8}} I would ...
Ulrich Neumann's user avatar
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MinimalBy with argument and value

I need to find element of some list arr which is minimal by some function f. But I need to get result in form ...
lesobrod's user avatar
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9 votes
8 answers
872 views

Shuffling two lists into each other

Given a subset s of Range[n] and two lists a and b, with ...
მამუკა ჯიბლაძე's user avatar
1 vote
1 answer
75 views

Value of a function over permutations of two lists

I want to do the sum (in Ising lattice gauge theory) ...
QFTheorist's user avatar
2 votes
3 answers
241 views

Getting all solutions to an equation on condition the variables are either 0 or 1

Given a list of 3-bit binary lists b={{0,0,0},{0,0,1},{0,1,0},{0,1,1},{1,0,0},{1,0,1},{1,1,0},{1,1,1}}; I would like to have all possible solutions to ...
Phillip Dukes's user avatar
1 vote
1 answer
73 views

Map list of strings to appropriately nested functions

I have a list of strings consisting of sequences of "+" or "-"'s. For example, let's take the list ...
AG1123's user avatar
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0 answers
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Selecting from a list of associations

From a list of Associations ...
eldo's user avatar
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2 votes
3 answers
187 views

Table with additional conditions for the generated objects

Suppose that I have a function prob[n_] := Table[Subscript[p, i], {i, 1, n}] that generates tuples with n entries that correspond to probabilities. What I would ...
ConfusedCabbage's user avatar
0 votes
1 answer
69 views

A simpler way of identifying which elements of Tuples[{0,1,2,3},6] multiply with each of my codewords to give zero?

So I have a list of codewords. The codewords have length 64, so there are 64 codewords in my code. My code is over an alphabet of 4 (the code can be thought of as having four elements $0,1,2,3$ and ...
QC123_367's user avatar
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7 votes
4 answers
505 views

Fill an empty matrix with the depth of its elements

Given an arbitrarily nested empty matrix like for example mat = { {}, {{}, {}}, {{}, {{}}, {}}, {{}, {{}}, {}, {{{}}}} }; and knowing that ...
eldo's user avatar
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1 vote
1 answer
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How can I make a map to solve in a list of coefficients of an equation?

I have a list list = {{2, -4, 3, 1, -2}, {2, -3, -4, -1, -2}, {2, -3, 4, -1, -4}} and ...
Laurenso's user avatar
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3 votes
6 answers
603 views

Repeating a list k times [duplicate]

I have a list, say $\{1,2,3,4\}$ and I would like to repeat this list k times to obtain a list of $4k$ elements that looks like $\{1,2,3,4,1,2,..,1,2,3,4\}$. I was hoping something like ...
gen's user avatar
  • 195
5 votes
5 answers
641 views

How to sort filenames in actual numerical order?

I have inherited a collection of files that are numbered... something like: file-0, file-1, file-2, ... file-9, file-10, file-11, ... file-19, file-20, ... When I Import them, they come in scrambled ...
bill s's user avatar
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7 votes
4 answers
276 views

Create a list of indexed variables and assign values in one line of code

It is easy to create a list of indexed variables F/@{1,3,6,8} I would like to assign values in the same line of code ...
Phillip Dukes's user avatar
4 votes
4 answers
209 views

Selecting elements from nested list based on condition

Assume that I have a nested list of the form d = 0.1; v = Table[{x, y, z}, {x, -1, 1, d}, {y, -1, 1, d}, {z, -1, 1, d}]; How do I select all elements {x,y,z} of ...
ConfusedCabbage's user avatar
0 votes
2 answers
175 views

Sorting a list of functions by exploiting the recursive structure

Given a list of functions list and a vector of arguments {t, a}: ...
Tugrul Temel's user avatar
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0 votes
2 answers
115 views

How to skip code in loop?

There is some box [a,b] and each box[a,b] have elements like ...
hare's user avatar
  • 394
2 votes
1 answer
59 views

Getting empty ListLogLogPlot from a Transpose

...
Julian Yussef's user avatar
3 votes
4 answers
89 views

Is there a better way to calculate the number of codewords of weight $i$ in a list of codewords?

Background Info I am interested in a better way of doing the following: I want to find the weights of the following codewords (the weight of a codeword here can be defined as the number of nonzero ...
QC123_367's user avatar
  • 481
0 votes
1 answer
79 views

Trying to plot the Fourier transform solution to the heat equation on Mathematica [closed]

I have gotten the solution of the heat equation as where f(y) is the initial heat distribution which I have been given as f(x) = e^([Sigma]x^2). I am supposed to plot this at the value of sigma 1, 2 ...
yen's user avatar
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2 votes
3 answers
177 views

How to express a list of lists of rules as functions?

Given a list of lists of rules as follows: ...
Tugrul Temel's user avatar
  • 5,490
2 votes
1 answer
57 views

What is the matter with EdgeList[] of a directed graph?

Given: ...
Tugrul Temel's user avatar
  • 5,490
2 votes
2 answers
118 views

Multiplying elements of two lists in all possible orders

I have two lists: U1 = {u10, u11, u12}; U2 = {u20,u21, u22}; and I want to get a third list that will be the product of these two lists in a particular order. the ...
Fatima RAZA's user avatar
2 votes
1 answer
60 views

How to modify a position on a list? [duplicate]

I have a set of points: data := {{10, 15}, {20, 45}, {30, 97}, {40, 162}, {50, 221}, {60, 249}, {70, 231}, {80, 166}, {90, 75}, {100, -5}} What I want to do is ...
Patrycja's user avatar
0 votes
1 answer
97 views

How not to process the first list?

(I reconsidered my previous question as it didn't describe well what I wanted to implement.So I repost this) There is a box [a,b] in order[x] generated in a random sequence. ...
hare's user avatar
  • 394
3 votes
2 answers
250 views

How to map an unbalanced list of lists as functions?

Given: Map[f, {{a, f, h, m, n, k},{a, b}, {z, d, f, h, k}, {c, d, e}, {c, p}}] I like to have a list of ordered functions as ...
Tugrul Temel's user avatar
  • 5,490
2 votes
4 answers
93 views

The first list is not processed

A randomly generated box[a,b] is in order[x] such that ...
hare's user avatar
  • 394
2 votes
1 answer
40 views

How can I use Flatten[list, 1] in this list?

My code list = Table[Expand[(k x - i)^2 - j^2 y^2], {k, 2}, {i, 2}, {j, 2}]; Flatten[list, 1] I get {{1 - 2 x + x^2 - y^2, 1 - 2 x + x^2 - 4 y^2}, {4 - 4 x + x^...
John Paul Peter's user avatar
2 votes
2 answers
105 views

How to "complete" the table by making all of its rows to have the same number of elements?

Consider the following table: ...
John Taylor's user avatar
  • 4,652
1 vote
2 answers
72 views

How to delete a list from a list?

I don't know how to delete a list from a list. For example, There is a list. ...
hare's user avatar
  • 394
2 votes
7 answers
315 views

How can I get a list of symmetric polynomials?

Q1: Suppose I have an expression like this one: $(1+x+y+z)^3$ How can I transform it into the following expression: $$\{1,x+y+z,x^2+y^2+z^2,xy+xz+yz,x^3+y^3+z^3,x^2y+x^2z+xy^2+y^2z+xz^2+yz^2,xyz\}$$ ...
deltaxxkkk's user avatar
1 vote
3 answers
91 views

Interpolating data which arent in the proper list form

I have some data which are structured poorly, and I want to interpolate them. This is the way they are structured: ...
100xln2's user avatar
  • 427
7 votes
6 answers
484 views

Apply function to all first arguments of a nested list of rules

Currently, I have a nested list of rules of the form lst1={1->a,2->{3->c,4->d,5->{6->f,7->{8->h,...}}}} (where I don't know the length of ...
cstover's user avatar
  • 323
1 vote
0 answers
98 views

Optimize grouping of list of lists by elements

I have a sorted list of lists of size ~200,000 x 3. The data are such that the first element of each triplet loops through i = 1, 1.1, 1.2, ..., 199.9, 200, and for every value of i, the second ...
TradeMark's user avatar
2 votes
2 answers
116 views

Convert list of variables to list of parametrized functions

I have a list of differential equations of some variables eqns = {f[x,y,x',y'],g[x,y,x',y']} e.g., f[x,y,x',y'] = x x' + y y'. ...
Joalito's user avatar
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