Questions tagged [list-manipulation]
Questions on the manipulation of List objects in Mathematica, and the functions used for these manipulations.
9,779 questions
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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 ...
- 10.6k
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How to Simplify 'unordered' lists of expressions
Say I have a list containing some expressions, for instance
...
- 357
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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.
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- 4,293
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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 ...
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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 ...
- 1,417
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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 ...
- 10.6k
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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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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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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
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Every repetition of the same list manipulation takes longer
Consider a list:
list = RandomReal[{-15000, 20000}, {#, 2}] & /@
RandomInteger[{1950, 2100}, 16000];
And a simple function mapped over it:
...
- 2,072
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1
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Thread @ Join unexpected behavior
Consider this example from the Wolfram Documentation:
Thread[f[{a, b, c}, x]]
{f[a, x], f[b, x], f[c, x]}
Now, let's modify the list:
...
- 2,072