Questions tagged [sorting]
Questions on the sorting/ordering functions of Mathematica (Sort, SortBy, Ordering, etc.).
6
votes
2answers
133 views
Sorting upon the first element of a nested list and show that as numerical values
I wish to sort the below list upon the first elements:
...
1
vote
0answers
47 views
how to sort an expression with descending coefficients?
I have an expression for example
psi = 0.24 FF1[0] FF2[1] FF3[-1] + 0.23 FF1[0] FF2[0] FF3[1] + 0.5 FF1[1] FF2[0] FF3[1] + 0.25 FF1[1] FF2[1] FF3[1]
I wonder how ...
1
vote
1answer
51 views
Sorting each column in a nested list contained in an association
I have an Association which contains three arrays 200x1000x2.
Each row m of a matrix denotes a different set of parameters, while
each column n contains the outcomes of the function for a specific ...
4
votes
1answer
78 views
AlphabeticSort of Chinese character is not working now
I want to sort strings of chinese characters. I used to use below code
list={"大家","早上","好"};
AlphabeticSort[list, Entity["Language", "ChineseMandarin"]]
And it ...
12
votes
1answer
376 views
ls Ordering[Ordering[list]] optimal?
Given a list list with unique elements, the task is to replace each element by its position in Sort[list]. For example,
...
2
votes
1answer
63 views
How can I animate the sorting by Sort, BarChart and Animate? [duplicate]
I try to make an animation of sorting like this but something goes wrong.
...
8
votes
3answers
468 views
Sort a list by elements of another list
I know there are a plenty of other questions here which appear to be similar, however I did not found anything which could give me a hint.
I have two lists:
...
12
votes
2answers
325 views
Terse Method to Swap Lowest for Highest?
I have built a solution to swap the lowest values with the highest values in a list.
With
...
6
votes
4answers
514 views
Sort with assumptions
I have a list which looks like this
list = {0, Subscript[x,7], -Subscript[x,3]-Subscript[x,9], -Subscript[x,9]};
and all the $x_i$'s are positive semidefinite (i....
1
vote
1answer
42 views
Inconsistency in SortBy [duplicate]
I have a list of data, I tried to SortBy it in two equivalent way, but the result is different.
The data variable is something ...
1
vote
1answer
53 views
Sort the data in the given way
Consider the data
data = {{x1,y1,z1},{x2,y2,z2},{x3,y3,z3},{x4,y4,z4},{x5,y5,z5},{x6,y6,z6},...}
with N rows.
It can be divided into N/3 sets of 3 rows. I would ...
4
votes
2answers
168 views
how to sort the expression not based on the Heads in Times?
Is there any way i can sort the following expression ?
a[k, l] b[i, j]
so that i would have:
b[i, j] a[k,l]
Mathematica ...
2
votes
1answer
139 views
3
votes
1answer
119 views
Sorting of a list with different lengths
I have a list of disordered numbers. They are collected in different lists. I mean
...
3
votes
2answers
227 views
Outputting expressions in the order in which they're entered
Background
For display purposes, I sometimes find it desirable to defeat Mathematica's canonical ordering of variables, and instead have it output terms in the order in which I type them. E.g., ...
1
vote
1answer
70 views
how to sort a list without build-in function
I want to sort a list like below.Without using the build-in function so I tried this:
...
7
votes
4answers
467 views
2
votes
2answers
181 views
Inserting an integer into a sorted list
I'm wondering if inserting an integer into a sorted list (in a way that the list remains sorted) can be performed in Mathematica in some fancy way in $\log(N)$ time?..
The question was asked here, ...
3
votes
2answers
306 views
What is the Alphabetical Inequality Test?
Mathematica can sort {"b","d","a","c"} into {"a","b","c","d"} with a simple application of ...
5
votes
2answers
209 views
How can I order this list on mathematica?
This is my list
Matrix = {{1, -2, 3, -4}, {{a, b}, {f, e}, {a, b}, {f, e}}}
I want to order the columns in ascending order depending on the values on the first ...
12
votes
1answer
215 views
OrderedQ with string arguments
I don't find these results consistent:
OrderedQ[{"a", "A"}]
True
OrderedQ[{"a2", "A1"}]
False
Is there any ...
0
votes
1answer
40 views
How to assume lexicographical ordering
Suppose I have functions which depends on the symbols $c[I]$, where $I$ is some subset of $\{1,2,...,n\}$.
For example, $$f = c[1] + c[1,2,3] + c[1,2],$$ $$g = c[2] + c[2,1],$$
Code:
...
15
votes
6answers
802 views
Better way to sort course grades
I use the following code to create a histogram of grades. Grades are provided as a List of strings such as "A-", "D+", "E" (don't ask), etc. The +/- substitution hack is necessary to sort the grades ...
1
vote
0answers
41 views
In what order does Combinatorica's SetPartitions function list the partitions of a set?
For example,
Needs["Combinatorica`"]
n = 4;
partitions = SetPartitions[Range[n]];
Table[Print[partitions[[i]]], {i, 1, BellB[n]}]
generates
...
2
votes
2answers
83 views
Nested sorting of lists
I have the following list representing a custom set of cards:
Each card is represented by a list of two elements, like this: {heart,9}
Using the code:
...
1
vote
3answers
56 views
Sorting out list elements that are nonlinear in a certain function
I have the following (long) list (exemplary I will show you only a few elements of it):
...
11
votes
1answer
122 views
stable sort for association?
Should I be able to use the "list of functions" approach to getting a stable sort of an association? In 11.1 I see,
...
1
vote
1answer
63 views
Import image files in the order of the file name number [duplicate]
I would like to import images which are frames from a video, they are numbered, so importing them in the correct order should not be a problem...
However, when I import them, by writing:
...
1
vote
1answer
74 views
How to order a sum in ascending order of the powers? [closed]
Consider the sum
x^1+x^3+x^2+x^4
I want to order this sum in such the I have the powers in ascending order
x^1+x^2+x^3+x^4
...
10
votes
1answer
185 views
Quick QuickSort implementation
I am playing with julialang and loving it, but at the same time noticed that they have a benchmark comparison with Mathematica. I have already submited a better version of ...
3
votes
2answers
44 views
5
votes
1answer
88 views
How to sort the data by several columns (some ascending and some descending)?
I have sorted the data firstly by the 3rd column and then by the 2nd column as below:-
a = RandomInteger[20, {30, 3}]
SortBy[a, {#[[3]], #[[2]]} &]
As you ...
0
votes
0answers
14 views
Maintain written order in expression (lexicographic sorting rules) [duplicate]
Is there any way I can get output to follow the exact order that I wrote it?
For instance (simple example)
x = z + a - b + c^2
comes out as
...
4
votes
1answer
63 views
Sort images by difference
I can use ImageDistance to get the Euclidean distance between two images. But, I have list of (~100) images, and I want to sort them such that the average ...
1
vote
1answer
80 views
Why do I need a second Function in SortBy for Association?
I cannot understand why I need a second pure function when trying to sort Association by Key. Here is an example
...
6
votes
6answers
344 views
0
votes
1answer
48 views
Delete duplicates and sort a list of sets separately? [closed]
I have a set where it has three subsets. I want to have each element of each subsets appears only once, sorted, but the order of subsets does not change. For example: I want to get from
$$
\{\{5,2,2,3\...
0
votes
0answers
41 views
SortBy not working in a delayed output
I have a table of large number of elements, each with three elements, say
A = {{a, b, c}, {e, f, g}...}.
I am using the function ...
0
votes
2answers
50 views
Sorting a table wrt to last two elements
I have a table-1 having 36 elements, each having the form {A, m, n}, where m & n are the indices (1-6).
There is another table-2 having 36 elements {m, n} in a particular order (like {{4, 3}, {2, ...
0
votes
0answers
38 views
How can I get a specific ordering in the matrix and the results of a system linear equations?
I have a linear system of 22 equations and variables. When I create the matrix form it sorts the coefficients on the first row (X1, X10, X11, ...) This ordering repeats for all columns and all the ...
8
votes
1answer
157 views
How to find the position in original list ranked first by SortBy
SortBy is a wonder and convenient way to sort a list using a list of functions with which ties can be broken.
...
3
votes
2answers
62 views
Changing the display ordering of orderless functions?
If I write
x = -(1 - 2 G M/r) \[DoubleStruckD]t^2 + (1 -
2 G M/r)^-1 \[DoubleStruckD]r^2 + r^2 \[DoubleStruckD]θ^2 +
r^2 Sin[θ]^2 \[DoubleStruckD]ϕ^2;
x
I see
...
1
vote
1answer
73 views
Feyncalc remove higher-order TensorFunction terms from expression
I am looking for a way to reduce the following expression:
...
0
votes
2answers
91 views
5
votes
2answers
171 views
How to replace columns of a matrix with an unsorted ordered list.
I have a matrix that I would like to replace the values of each column with where they are in an ordered list of values from least to greatest. For example, if I have
...
2
votes
2answers
256 views
How to sort ordered pairs by one coordinate with the other serving as tie-breaker [closed]
I have a collection of $N$ ordered pairs,
$$\{\{x_{1},y_{1}\},\cdots,\{x_{N},y_{N}\}\}$$
These ordered pairs can have at most one entry in common, i.e., if $x_{i}=x_{j} \left(y_{i}=y_{j}\right)$ ...
2
votes
2answers
53 views
How can I generate a list of function calls in the sort order of values of the calls?
My problem is that I have a defined function, say, foo, and I am using the built in Sort function to order a sequence of calls
<...
2
votes
1answer
92 views
How to sort string codes by their alpha and numeric tokens?
I have a large list of codes of the following form:
codes = {"Fee.C21HJ.S4", "Fee.TOxC12.S1", "Fee.TOxC9.2 BB", "Fee.ROxC9.4", "Lag.C39"};
I would like to sort ...
2
votes
1answer
521 views
What is “standard” or “canonical” order? [duplicate]
When trying to sort a list of fractions and quadratic numbers I'm trying to work out why sort orders the quadratics after the fractions. It seems to use the function "OrderedQ" and "standard order" or ...
0
votes
1answer
34 views
Sort solutions obtained with the resolution of a system
After the resolution of a system of 4 equations, i obtained these solutions :
...
