Questions tagged [list-manipulation]
Questions on the manipulation of List objects in Mathematica, and the functions used for these manipulations.
9,781 questions
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How to find a matrix in a ragged list?
I have been trying to efficiently process data scraped from websites. One issue is that the data I want is often in the form of a matrix embedded at some level in a ragged list. I have developed one ...
- 5,468
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I can not reproduce returning the property of selected elements by Select[]
According to the documentation,
Select[data,crit->prop]
should return the property prop of the selected elements.
When I run
...
- 125
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In a nested, ragged list, pairing each element of one sublist with each element of another
This may be a silly question, and if it is, I'm willing to withdraw it. I have a list of lists myInitialList. I wish to write a function to transform ...
- 10.7k
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How to Simplify 'unordered' lists of expressions
Say I have a list containing some expressions, for instance
...
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Why is Position with level spec {1} evaluating on {0}?
The title says it all. These two examples both have StringEndsQ emit an error message because it's being evaluated on the head of the input list.
...
- 4,345
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What is the List analogue to StringSplit?
Suppose I have a string myString = "ABC DEF". To split myString into a list of separate strings delimited by ...
- 10.7k
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How to find all possible splits of a list into sublists sharing exactly one element?
Given a list, I want to find all possible ways to split it into sublists such that:
Each sublist has length greater than 1.
Any two consecutive sublists share exactly one common element.
All elements ...
- 1,427
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Apply a function onto sublist and include an additional argument
I have myList, a list of triples:
myList = {
{a1, a2, a3},
{b1, b2, b3},
{c1, c2, c3}
};
I wish to apply a function ...
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How to apply a list of binary operators to a list of arguments respecting standard operator precedence?
I have a list of binary functions such as {Plus, Times, Subtract} and a list of symbols like {a, b, c, d}. I want to construct ...
- 5,782
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2
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KroneckerProduct of vectors with different grouping
I have just encountered a weird problem for which I cannot understand the reason. Say I have two vectors that I define as
o = {0, 1};
z = {1, 0};
Now I am ...
- 1,226
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11
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Riffle a list of binary functions into list of arguments to produce a result
Suppose I have a list of binary functions, e.g.
funcs = {Plus, Times, Power}
as well as a list of arguments, e.g.
...
- 1,720
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How do I get the rolling five-year averages for two values from a double nested list?
My data looks something like this:
...
- 11
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How to extract specific strings in items inside a list?
I have data I want to plot comprised of values on time.
The data comes from a .log file imported as Table. Each line in this file is logged as
[2025.09.15-12.36.00:160][543]Log: 42
being [Date and ...
- 23
