Questions tagged [list-manipulation]

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

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2 votes
4 answers
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From original dataset, find the probability of each element in each row having the maximum value in its row

Suppose I have this dataset {{1, 3, 5}, {4, 4, 2}, {5, 3, 5}, {10, 4, 10}} // MatrixForm How do I find the probability that each cell is the maximum in its row. So ...
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  • 109
1 vote
1 answer
38 views

ListLinePlot showing the wrong domain and not starting at zero

I am trying to plot a graph that starts at zero from a list using ListLinePlot. The code: ...
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-6 votes
1 answer
70 views

Assign value to tuples from tuples [closed]

Here is my code Can you help tell me what is wrong with my code? I am trying to assign value from a tuple of number to a tuple of variables. In my code d is the tuple of numbers and e is a tuple of ...
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  • 109
1 vote
1 answer
174 views

How can we fix an incorrect form of data?

incorrdata=Import["https://www.dropbox.com/s/lk7wiutjf4bx5yk/DataX.dat?dl=1"]; How can I fix this data, it should be in the form {$a,\bf{b}$} where b is ...
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0 votes
1 answer
95 views

Plot eigenvalues of a matrix with two variables [closed]

I am trying to plot eigenvalues E(kx,ky) of the matrix [mat] depends on two variables kx and ky and of course n its dimension , and the matrix elements a, b and c depend on cos(kx) ; cos (ky) and cos(...
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  • 19
4 votes
1 answer
68 views

Ordered list of integer vectors

For a given length $n$ and a maximum positive integer value $N$, I'd like to generate a list that contains all $n$-vectors with entries between $-N$ and $N$ (of which there are $(2N+1)^n$. Further, ...
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  • 91
0 votes
1 answer
68 views

Splitting a data set into multiple parts

The Problem I am trying to split a data set into multiple parts - thanks to help in the past, this has been done before into 2 parts, but I would like to extend this functionality into multiple parts (...
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  • 471
3 votes
2 answers
88 views

Partition the list by group of Arithmetic Progression

I have a list= {4, 8, 10, 11, 12, 14, 16, 7, 9} How can i partition the list by group of Arithmetic Progression with common difference 1 : {{4}, {8}, { 10, 11, 12}, {14}, {16}, {7}, {9}}
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6 votes
3 answers
243 views

Replace items of list except items that are member of another list

I want to replace all items in li1 that are not members of li2 with x. ...
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  • 2,842
2 votes
3 answers
88 views

How to extract from a list based on a partial alphanumeric string

Consider the following list. I've tried various ways to extract only those pairs in the list where both elements have the string N36. Given the below, the output would be just {N36012,N36321} and {...
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  • 1,061
1 vote
0 answers
31 views

Generating a table of lists following the set of rules

I am trying to generate a table of degree sequences for simple connected graphs for a given number of nodes. Example output for $n=4$: ...
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  • 81
0 votes
0 answers
42 views

Remove rows of table based upon Indeterminate value in final column

I have a large table in form exampletable = {{1, 2, 3, 4, 6 }, {2, 3, 7, 8, Indeterminate }, {9, 2, 6, 4, Indeterminate }, {1, 7, 3, 4, 4 }} How to Remove rows ...
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  • 711
0 votes
1 answer
61 views

List structure for plotting multiple y-values (with gaps on certain dates) using DateListPlot

I would like to set up a list like this data = {{Date1,y1,y2,y3,y4,y5,y6},{Date2,y1,y2,y3,y4,y5,y6},...} and then use DateListPlot to create various plots, e.g. y1 ...
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7 votes
1 answer
158 views

Remove elements with even instances from a list

Suppose I have a list, ...
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  • 422
0 votes
0 answers
55 views

How can an algorithm be written in Mathematica language in a scientific paper? [duplicate]

I have a scientific research in which I used an algorithm in an optimized language to simplify the calculations, which is important and should be included in the paper. Algorithm ...
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3 votes
2 answers
91 views

how to extract members of a List sitting inside 2 by 2 table? [closed]

I have a two-by-two table. Each element of the table is a four-member list: ...
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0 votes
0 answers
38 views

How to apply the map function to NMaximize to build a 2*2 table?

I have a single variable function, named globalprofitfuntion[beta]. I am using NMaximize to locate its maximizer, beta*. This function has four parameters: cv,cr,k and w. To perform sensitivity ...
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1 vote
1 answer
122 views

How to get one-bit changed permutations?

The following Tuples[{0, 1}, 2] // Permutations produces a list of permutations of {{0, 0}, {0, 1}, {1, 0}, {1, 1}}. If I want ...
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2 votes
2 answers
108 views

Invert undirected graph edge

Suppose I have a list of edges, {1 \[UndirectedEdge] 2, 1 \[UndirectedEdge] 3} How do I get the 'invert' of the list, ...
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  • 422
3 votes
3 answers
270 views

How to get all possible sums or possiblity of sum three numbers?

Got motivation from this and I'm trying to do this: {#1 , #2 , #3, #1 + #2 + #3} Where #1, #2, #3 are integer numbers from 1 to ...
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  • 2,392
3 votes
2 answers
72 views

Importing multiple files with filename conditions

I have multiple pictures I would like to import all at once. The filenames range from "000001.tif" to "000200.tif." I am having a hard time importing multiple images after looking ...
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  • 107
4 votes
2 answers
71 views

Normalizing the output of Apart

My question is closely related to this one but the accepted answer does not meet my needs. I have a rational function $f(x)$ in one variable which admits a partial fraction decomposition of the form $$...
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1 vote
1 answer
38 views

Manipulating the list with variables

I am trying to find the maximum element of the list for a given value of variable $c$. The example of the list is as follows: ...
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  • 81
6 votes
1 answer
92 views

filling between two listplot with unequal length

I have two sets of data : ...
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  • 63
2 votes
3 answers
142 views

Is there a way of column-based ArrayReshape

I have checked the official document of ArrayShape of Wolfram Language. I am wondering is there a column-based way to do ArrayReshape? Let me give a simple example, if I run ...
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0 votes
0 answers
50 views

Rearrange a Nx2 list into a 2 arrays of length N

Mathematica newbie here, thanks for your patience. I have a list of 2-element lists, i.e. {{x1,y1}, {x2,y2}, ... {xn,yn}} But I want to rearrange them so that ...
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  • 31
2 votes
1 answer
87 views

Reconstruction on large sparse array

I'm struggling with a reconstruction of a large sparse array. What I'm trying to do is to rearrange a 2 dimensional array (respresenting a system matrix for a given system of equations) such that I ...
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  • 23
4 votes
1 answer
78 views

How to generate a list of lists from a given list following a rule recursively?

Assume that I have made the following rule: Rule: {x1,x2,x3,x4,x5,x6,x7,x8} -> {x1,x2,x3,x4,x5,x6,x7,x8}, {x4,x5,x6,x1,x2,x3,x7,x8}, {-x1,-x2,-x3,-x4,-x5,-x6,x7,x8}, {x1,-x2,x3,x4,-x5,x6,-x7,-x8}...
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  • 2,419
1 vote
1 answer
66 views

Extracting powers of a sum

Given a sum in the form Sum[n^k, {k, kl}] for some natural n and natural list kl, is it ...
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  • 4,358
2 votes
3 answers
230 views

How to do column vector concatenation

Is it a way to do column vector concatenation? u = {{1},{-1},{0}}; v = {{0},{1},{-1}}; w = {{-1},{0},{1}}; I would like a matrix of {u,v,w}
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3 votes
1 answer
43 views

Plotting Individual Variables from RandomFunction

I have defined an Ito Process such that: ...
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2 votes
1 answer
75 views

Table range as disconnected interval

I wish to evaluate table entries but with the dummy variable taking values in separate intervals. For instance, instead of writing ...
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1 vote
1 answer
59 views

Efficiency on array iteration

Consider a 2-d array n by n of the form array1 ={ {x11,x12,x13,...,x1n},{x21,x22,x23,...,x2n},{xn1,xn2,xn3,...,xnn}}. I want to expand every point in this array in ...
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2 votes
1 answer
83 views

Minimize Sum of Hamming Distances

Problem: Given an $n \times m$ matrix with binary values $(0,1)$, find a binary vector that minimizes the sum of Hamming Distances to the rows. Example: If the matrix is {{$1,1,1$},{$0,0,0$},{$1,0,1$}}...
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  • 33
3 votes
2 answers
89 views

Finding the consecutive distance of n-dimensional points with Mathematica

I want to create a list of (n-dimension, average of points) with 10,000 points per n-dimension. I can't figure out how to take the distance of consecutive points. Say in 2-dimensions, there are 3 ...
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1 vote
2 answers
105 views

How to generate a numerical table?

I have the following issue for generating a table in Mathematica. How to generate a table with the limits 10^-18 to 10^-6 with steps of (1,2,3, ....10)*10^-1? e.g. It should look of the following form:...
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3 votes
2 answers
110 views

Get the coordinates from RegionPlot3D

I have a plot generated with RegionPlot3D and need to extract the coordinates of the points on the plot. I'm trying to apply the approach from this question about RegionPlot to RegionPlot3D but it ...
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  • 133
0 votes
0 answers
48 views

Droping a row from a matrix [duplicate]

I want to drop a row from a matrix but the output seems to be: MatrixForm[] My code: ...
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  • 1
6 votes
4 answers
819 views

Implementation of MATLAB's "numgrid" function [closed]

I am looking for an implementation of MATLAB's numgrid function, in particular the "B" mode. For example, I want to get the matrix corresponding to the ...
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2 votes
1 answer
62 views

Sorting of a list of lists - i.e. list of matrices - what is the order of the sort determined by?

In the documentation we have: Sort[list] sorts the elements of list into canonical order. Maybe I am missing something but what does "canonical order" mean for sorting a list of matrices? ...
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  • 525
5 votes
3 answers
161 views

How to map a function across multiple ragged lists

Preliminaries I have lists that are lists of lists (i.e., each list contains one or more sublists and are ragged (i.e., each sublist can have a different length, though all have a length of 1 or ...
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  • 9,485
5 votes
3 answers
204 views

matrix Crop (remove leading and trailing zeroes in matrix)

I have some matrices that have 0's around them, for example, give such a matrix MatrixForm[ mat = ArrayPad[{{1, 2, 3}, {0, 0, 0}, {7, 8, 0}}, {{1, 2}, {2, 3}}]] \...
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  • 5,102
1 vote
2 answers
86 views

How to assign table parameters to use it many times

I'm using two nested Table to generate data which depend on two parameters, let's say it is temperature and pressure, many times in my code. When I change the temp ...
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  • 95
3 votes
1 answer
162 views

Generating a non-convex polyhedron from polygons and normals

I am working on developing "directional offset" module, which requires pretty tricky mesh generation: offset values vary in different directions. Suppose I have list of points and polygons, ...
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  • 151
1 vote
1 answer
60 views

Draw the values of two variables each on a axis in a square

I plot lists of {xA1} over time and lists of {yB1} over time. Now, How can I draw two lists {xA1} and {yB1} so that the values of each are shown on a separate axis inside a square? (same as below ...
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  • 55
0 votes
1 answer
60 views

Pulling Results from NDSolve within a Table

I am still learning the intricacies of Mathematica. I have an NDSolve within which I am trying to vary a specific parameter (I understand that ParameticNDSolve is likely a more efficient tool--the ...
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  • 21
0 votes
0 answers
29 views

DiscretePlot with a List as argument [duplicate]

Suppose I have some multidimensional function that is computationally very expensive to evaluate. Here, I will just use ...
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  • 101
0 votes
2 answers
38 views

How to replace the 6th column with another column? [duplicate]

Consider the following table: tabb = Table[RandomReal[{0, 100}, 100], {i, 1, 10, 1}]; How to replace its kth column (say, the 52th column) by the column ...
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  • 4,038
2 votes
2 answers
138 views

Add quotes to each element in a list

How to add quotes to each element in a list? For example, we have a list as: ...
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  • 513
1 vote
0 answers
56 views

An error in the short form of a two-dimensional array?

I noticed very strange behavior in the function Short when applied to a two-dimensional list of real numbers in Mathematica 12.3. Consider that ...
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