Questions tagged [built-in-symbols]
Questions related to handling built-in symbols and functions, for example why they behave a certain (possibly unexpected) way.
189
questions
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What could go wrong in redefining Power to act on functions?
Inspired by a tweet (from a locked account, unfortunately, so I can't link it), we can get notation like $\cos^2(x)$ to work in Mathematica in general:
...
1
vote
1answer
52 views
How to define distributivity of CenterDot on bras and kets
I am working on a code for a coupled quantum harmonic oscillator and found myself in a hiccup when trying to evaluate the inner product of linear combinations of bras and kets. I have initially ...
3
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1answer
71 views
15
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1answer
257 views
Head[x] vs x[[0]]
Can we say Head[x] and x[[0]] are identical ?
In mathematica manual I could find : 'The head is the part with index 0'
But I am not sure whether Head[x] are x[[0]] are really interchangeable in any ...
2
votes
2answers
63 views
A condition for the given point to be included in the domain?
If we have two domains, it is possible to check whether one domain is inside another domain:
...
3
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2answers
94 views
A condition for one domain to be included in another domain?
Consider two domains:
domain1 = Rectangle[{-2.5, -2.5}, {2.5, 2.5}];
domain2[R_] := Disk[{0, 0}, R]
I would like to check whether the second domain is completely ...
2
votes
1answer
77 views
How to find the area of circle inside the rectangle?
Consider a circle located at the origin
circ[R_] := Circle[{0,0},R]
and an arbitrary rectangle
...
0
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0answers
43 views
Dot Product doesn't behave like normal function
I am trying to slightly modify the Dot function by treating it like a usual function, but soon I notice something weird about it.
Suppose there is a set ...
5
votes
1answer
60 views
Counting the number of edges between two graph partitions
Consider the following:
g = RandomGraph[WattsStrogatzGraphDistribution[1000, 0.1, 5]]
comm = FindGraphPartition[g, 2];
CommunityGraphPlot[g, comm]
...
2
votes
1answer
114 views
How &@ and &/@works?
I have the following expression:
(Join[#, Reverse[#, {2}]] &@Partition[#, 2, 1, 1]) & /@ Vec
(* where: *)
Vec={{2,0},{1,1},{0,2}},
but I am not sure how ...
2
votes
3answers
359 views
Compare all elements of a set with a specific number and return 1 or 0
Say I generate a set of 20 random numbers by x=RandomReal[{0, 1}, 20], I want to compare every element of x with 0.4. If it is less than or equal to 0.4, then return 1; if it is greater than 0.4, then ...
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50 views
Avoiding Tables, Do and other loop construction
In my work I have a lot of cases, where I should calculate non-listable functions for a quite large number of points. To be more concrete, consider first listable function ...
1
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0answers
74 views
How to figure out syntax for symbols?
I'm new to Mathematica and am having a hard time figuring out how to type certain symbols when I read the documentation.
For example, in https://reference.wolfram.com/language/ref/...
16
votes
3answers
963 views
Which function names have been re-purposed in Mathematica after being deprecated?
I have just learned about the new function Splice from this answer. It turns out that this function used to have a completely different usage! (See below.)
To me, ...
11
votes
1answer
461 views
Finding year that MMA functions were introduced via programmatic calls in the Wolfram Language [duplicate]
Is there a way to find the year that MMA functions were introduced via programmatic calls in the Wolfram Language? I would like to be able to create and manipulate such a list or dataset.
4
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0answers
41 views
What built-in functions have bad time/space complexity and their alternatives?
It's surprising that Join is $\mathcal{O}(n)$ (due to copy) while I've been using it as a convenient way to join lists together. It also reminds me of suggestions ...
3
votes
1answer
101 views
How can I prevent TabView from resetting the current tab?
This is a simplification of a problem that has arisen in a project regarding Euclidean activities for verifying proportions via operations
on pairs of magnitudes. In the project, the LocatorPane is ...
5
votes
2answers
103 views
Customized priority function in DataStructure[“PriorityQueue”]?
I'm using Mathematica 12.1. The documentation for DataStructure["PriorityQueue"] claims that,
... the highest-priority element is always returned.
The ...
1
vote
1answer
63 views
Define trace-like function (e.g. cyclically invariant) involving operators without built-in meaning
I am interested in defining a function, say $\mathrm{Tra}$, that imply operators without build-in meaning, say it involves products with the $\cdot$ (Esc . Esc), ...
3
votes
2answers
58 views
Define the behavior of operators without built-in meaning
I need an operation $\tilde{}$ that lifts another operation (for example, the sum, but this does not have to be limited to real numbers) in the sense that $\widetilde{ (x \oplus y)} = \tilde x + \...
0
votes
1answer
27 views
What is the general behavior of the “enter” character, and why does the specific behavior differ in these four situations?
I am trying to understand the exact behavior of the "enter" character in Mathematica. (I am not even sure what to call it: perhaps it is really the carriage return or newline character, which is input ...
3
votes
1answer
144 views
How to get information from all built-in Mathematica functions in order to create a Kotlin library like the Wolfram Client Library for Python?
I'd like to use (if this already exists) or create a library to use Mathematica together with Kotlin (or Java) (not JLink, please see below).
We already have this very useful implementation for ...
3
votes
0answers
85 views
PowerModList anomaly
This post is related to Not comprehending PowerMod. Here the issue is that PowerModList, in v. 12.1 finds no cube roots of 1 Mod 10^60 - 1:
...
2
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0answers
55 views
Who Defines Symbol \$MySource
When I start up a fresh executing Mathematica on my MacOS system and I open a Notebook file there is always one symbol defined in the Global context. This symbol is \$MySource and it points (via a ...
13
votes
2answers
585 views
Looping through all functions defined in Mathematica
Is there a way to loop through all the Functions (Elementary and Special functions) that exist in Mathematica?
I want to construct a table of some identities and maybe I can discover something ...
2
votes
0answers
64 views
How to override a built-in Mathematica function using its old version?
How can we override a Mathematica built-in function using itself in the definition?
For example, the DiracDelta function is not defined for complex numbers like:
<...
2
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0answers
49 views
How to Return All Mathematica Functions in a Domain
We know that Names["System*"] and WolframLanguageData[] both return the list of all System or "native" functions.
Is there a ...
6
votes
1answer
90 views
What is the meaning of “Introduced in …” and “Updated in …”?
I am looking at the documentation of a Mathematica function and at the bottom it says Introduced in 1988 (1.0) | Updated in 1996 (3.0).
What exactly does this ...
2
votes
1answer
62 views
About AbsoluteCorrelation
In my understanding, "the absolute correlation" is not such a common expression. Can anyone kindly explain the significance of the built-in symbol ...
1
vote
2answers
201 views
Semi-direct product and crossed product symbols
Does Mathematica have any symbols for the semi-direct product $\rtimes$ (or $\ltimes$) and the crossed product $\bowtie$? I have looked at the lists containing all symbols and couldn't find it there. ...
0
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0answers
38 views
After execution of simple list manipulation every expression turns dark blue and nothing is defined - how to debug
This question is related to this one in the sense that it uses the code from there.
What happens is best illustrated in the video here. When I run (* part 1 *) ...
4
votes
1answer
614 views
Wrap angle to [0,2pi[
Is there any built-in Mathematica function that wraps any angle in rad to the $[0,2\pi]$ domain?
So, for example:
wrapTo2pi[9Pi/4]=Pi/4
I know such function ...
2
votes
0answers
40 views
Pattern matching and NonCommutativeMultiply
I am trying to define some functions using NonCommutativeMultiply and I am experiencing some strange behavior.
Consider the following expression
...
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Error Message for GrammarRules and GrammarApply
I have been struggling with the following issue regarding an irregularity when deploying and applying GrammarRules. Specifically, it often takes several failed attempts before the execution is ...
3
votes
1answer
103 views
How to get the bit size (bit length) of an integer? [closed]
Suppose I have the integer 255, so 11111111 is its base 2 (bit) representation and the bit size of 255 is 8.
How can I calculate the bit size of a (big) integer in Mathematica?
Is there a built in ...
6
votes
2answers
129 views
Operators without built-in meaning are incompatible with parallel evaluation
Mathematica has a useful set of Operators Without Built-In Meanings. For example: CenterDot, CircleDot, ...
0
votes
0answers
80 views
How does Wolfram Language implement for enabling symbols to receive various forms of parameters? [duplicate]
How does the official implement a list/tuple of parameters that can be different in type and quantity as a whole?
After re-read @Szabolcs's and @MichaelE2's comments.
Finally, I accepted the ...
1
vote
3answers
119 views
Why do atomic objects like 56 have a head if they're supposed to be, well, atomic?
This question follows from this one I made earlier.
If you ask for FullForm[4] you will get back 4, and that's fine. ...
3
votes
2answers
166 views
What's the difference between 56 and Integer[56]? [duplicate]
I'm trying to grasp how to Wolfram Language uses symbolic expressions for everything. The concept of doing so makes sense to me, but the language doesn't behave how I predict.
I understand how ...
2
votes
1answer
163 views
Automated (lazy) method to make custom (key-input) shortcuts (not menu items) for letter-like symbols? [duplicate]
The Problem:
I don't know about you, but every time I am trying to do analytical work in Mma, it is rather difficult/cumbersome for me to type the following, here specifically for ...
0
votes
1answer
70 views
Symbolic Resultant Too Slow/Keeps Running
Evalutation of the following cell, which includes the symbolic resultant, of two univariate polynomials in $x$, with parameters $a,b,c$ for the first polynomial (of degree 4) and parameters $d,e,f,g$ ...
1
vote
1answer
84 views
JoinAcross with multiple associations
I would like to use JoinAcross to combine several lists of associations. Extending an example from the documentation, I'd like to do this:
...
0
votes
1answer
41 views
Apply Expand only to parts of expression
I have the following term:
term = (x AngleBracket[x (-x+Sum[v'[y[j]],j])])/AngleBracket[x^2]+Sum[v'[y[j]],j];
term //TeXForm
$\frac{x \left\langle x \left(\sum ...
5
votes
2answers
517 views
Underflow error General::munfl from E^x instead of Exp[x]
In contrast to earlier versions, Mathematica 11.3 and 12.0 generate lots of underflow errors from my code, e.g.
...
2
votes
1answer
168 views
How I can get glyphs from a fraktur font and use them as identifiers?
I would like to use the fraktur-S ($\LaTeX$: \mathfrak{S} $\mathfrak{S}$; Unicode: "U+1D516" 𝔖) as a variable name in Mathematica, but pasting the Unicode ...
2
votes
2answers
97 views
Replacing with pattern on built-in symbols?
I have:
f[a, b] /. f[x__] -> g[x, 0] // InputForm
(* Out: g[a, b, 0] *)
Which is what I expect, but when I use a built in symbol instead of ...
5
votes
1answer
124 views
How to reset a built-in symbol to its default definition?
I'm trying to add functionality to some of Mathematica's built-in functions in a package I'm building. I'm not trying to overwrite any functionality—just add it where it isn't already defined.
I ...
4
votes
2answers
125 views
DisplayForm problem with $\pi$ in FractionBox
The following line produces an output with the text "Pi" displayed instead of the symbol (greek letter) $\pi$.
Code line:
FractionBox[π,2] // DisplayForm
...
