Questions tagged [symbols]
Mathematica symbols are the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attributes.
340
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Out put of FeynCalc is not symbolic
When I run, for example:
LC[$\alpha$, $\beta$, $\mu$, $\nu$] MT[$\mu$, $\nu$]
the out put is
LC[$\alpha$, $\beta$, $\mu$, $\nu$] MT[$\mu$, $\nu$]
rather than
$\varepsilon_{\alpha \beta \mu \nu}g_{\mu\...
1
vote
1
answer
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Functions involving variables that have been "Symbolized"
I used the Notation package to symbolize expressions of the form Superscript[u,_]. I then proceeded to manually input the values ...
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0
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Why must the "&" symbol be placed inside function instead of outside? [closed]
The following code is taken from Wolfram Community "Quantum Error Correction: bit flip".
...
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3
votes
1
answer
150
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Do symbolic integration of function including \[ScriptCapitalL]
I have done a symbolic integration in mathematica 13.2 as follow
Integrate[-((Sqrt[-r(r - 2 l)] l)/(r(r - 2 l) (-r + l))), r] // Simplify[#, r > 0] &
...
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0
answers
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Temporary symbol leaks into public context?
This phenomenon has confused me a long time. Consider the following package example,
...
- 2,208
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1
answer
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What is the relationship between a list of symbols created by a specific name, and a expression with such a name?
I'm trying to create a list of symbols called "x" for calculating symbolic gradients of some functions, so I write:
...
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4
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1
answer
112
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Purple color text related with RowBox
Type the first line of following code and press enter key.
...
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0
answers
41
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Annoying Glitch when inserting symbols
Anybody else had this glitch when inserting symbols
This should be ::Delta
- 163
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votes
1
answer
78
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Basic question Sort criteria
Can you explain the following codes? (output of codes)
I know that
there is the default ordering for any expression in Mathematica
and Sort uses the default ...
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0
answers
42
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Why Names will search all subcontexts?
My version is 13.2. When debugging I came across this peculiar feature of Names.
Starting with a fresh kernel, define
Then ...
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votes
0
answers
56
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how do you choose a receiver of expression between just-a-symbol and function?
for a formula eg y=a*x+b in book, we can use y=a*x+b and use y to quote the expression ...
- 343
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vote
2
answers
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Difference between (Names of ) Symbols and Mathematical Objects [closed]
The documentation says: "The Wolfram Language by default interprets any sequence of letters or letter‐like forms as the name of a symbol."
But when I test for example the object "=...
- 35
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0
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Why is variable in function definition not local in Mathematica?
I was surprised to find out the names of arguments of a function definition are not "temporary name/formal name"
...
- 343
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Is there a way to see all symbols defined (eg all variables and all functions) in Mathematica like Matlab? [duplicate]
Is there a way to see all symbols(like variables and functions) defined in current Mathemactica-memory? I remember in Matlab one can see all symbols and their values in a "grid"(may be a ...
- 343
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0
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Sorting stored variables in memory
Given the list of stored variables
Names@"`*"
is it possible to sort them by size in used memory?
- 4,179
1
vote
0
answers
36
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How to create a Sort function that does not differentiate between String rule keys and Symbol rule keys
Im trying to Sort Rule-s according to Key-s (or names) but the normal ...
- 2,407
4
votes
2
answers
125
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What does the "$" symbol mean in Mathematica programming? [duplicate]
I cannot find any reference to the $ in the Mathematica documentation, yet I frequently see it used, especially on StackExchange.
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2
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0
answers
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Is it safe to alias a ResourceFunction with a symbol of the same name?
The following will show how easy I alias Ding which is my very first ResourceFunction and it works very well. ...
- 2,407
3
votes
3
answers
145
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Replace repeated items differently
So I have a simple replacement rule of the following form:
expr/.f[a_,b_]:> g[a,#]g[b,#]&@func[]
i.e. I want to replace each function f[a,b] with two ...
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1
answer
170
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Can you use superscripts as variable and function names?
I want to express the following function:
$z^{(1)}=w^{(1)}a^{(0)}+b^{(1)}$
I have read in Mathematica documentation that Symbolize can be used to define variables ...
- 323
2
votes
1
answer
438
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How to copy infinity symbol as ∞ and not as \[Infinity]
FromCharacterCode[8734]
(* ∞ *)
No matter how I copy ∞ whether as plaintext or input text or whether it is inside string like <...
- 9,993
5
votes
2
answers
250
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How stack text over an arrow
As part of a visualization of a mapping from a planar domain to another planar domain, I want to create a Row of the form ...
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7
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1
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What does the operation Map[({...}=#;{...})&, ] do?
With reference to the answer by @Bill to the question posted here, I am trying to understand the following three lines
...
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5
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3
answers
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Get the symbol name of the function's nth argument
I tried this:
Plo[fun__] := SymbolName @ Part[List @@@ Unevaluated @@ {Hold[fun]}, {1}, 2]
SetAttributes[Plo, HoldAll]
On ...
- 207
3
votes
2
answers
345
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What is the difference between Clear and ClearAll? [duplicate]
I'm reading Mathematica Programming by Leonid Shifrin. And it said
ClearAll serves to clear all definitions (including attributes) for a given symbol (or symbols), ...
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0
answers
60
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5
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1
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97
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How to get the Echo >> symbol?
What is the character code or way to get/type the >> symbol used when echoing something?
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0
answers
40
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Sequence in superscript
The code DisplayForm@SuperscriptBox[a,b,c] makes a invalid box. It still renders like $a^b$, but it's red with an error message (as it should be).
That being said,...
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2
votes
0
answers
50
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Once[…, "location"] adds $CellContext` to all global symbols
For certain persistence locations, such as "Notebook" or "FrontEndSession", ...
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1
vote
1
answer
106
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Private`x from a package function used outside
I'm fairly new to the Wolfram Language and I'm having a problem with how packages work.
I have some function that are inside a package, the goal of those function is to create random polynomial ...
- 69
3
votes
1
answer
133
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Symbolic representation of large output
The package xAct does something really nice when it handles large outputs, which is to represent the expression as a symbol and display that symbol when the cursor hovers over it. For example,
...
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3
votes
3
answers
104
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Get coefficient of a symbolized symbol in a sum that involves other symbolized expressions
My mathematica notebook begins with symbolizing all expressions of the form $x$ subscript an integer, "$x_k$",
...
- 195
0
votes
0
answers
50
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Why does local sigma escape its Block in Mathematica 13.0.1?
My objective is to utilize Traditional Form in .NB files. But I've run into a problem where variables I intend to be local to a Block "escape" with an assigned value causing unexpected &...
7
votes
2
answers
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How to show distance between two horizontal lines in a graph
I want to plot a like this
So far, I am able to plot it like this
**
However, I am unable to add that \[Sigma] symbol between those two
dashed lines.
How do I do ...
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2
votes
1
answer
97
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Composition of functions not working [closed]
I am trying to set a function within a function. What I do is to first create a function with two arguments. Then I would like to set a new function with the same two arguments, in which the previous ...
- 125
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vote
1
answer
131
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Strange eigenvalues result
I asked mathematica to determine the eigenvalues of a 3x3 matrix and the result it gives me is:
...
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0
answers
158
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Why does mathematica sometimes use a visual fraction and sometimes use a symbolic fraction?
Sometimes when I have an input, mathematica will give the out put with a visual output of the fraction:
i.e
Input:3/4
Output:
3
---
4
whereas other times it ...
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0
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93
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What does [W_Wad] mean?
Found this one in closed forms of a fraction.
Wolfram only gives a way to copy as plain text:
(3830 W_Wad)/1177≈0.97621070518266779949
And then it won't recognise ...
0
votes
2
answers
91
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A problem when solving an equation with symbolic variables
I asked a question a couple days ago and received a solution that worked for me at the time. But now I am seeing that the proposed solution fails for some other cases I need.
For example, if I just ...
- 207
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votes
1
answer
62
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Using the symbol of the system of equations [duplicate]
Part 1
I'd like to know how to use the symbol of system of equations (left curly braces). I tried the following code:
Part 2
How can I add a third equation?
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Symbol of system of equations
I'm wondering if there is a way to use the symbol (the left curly bracket) of a system of equations. So far I found only the following "symbol":
I need to remove the two conditions.
EDIT2: ...
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votes
0
answers
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Is there a concise way to generate a continuous less-than relationship?
Actually, I have a ton of variables, Let me simplify it to 4 in this post.
vars = {a, b, c, d};
0 < Less @@ vars < 10
0 < (a < b < c < d) < ...
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votes
1
answer
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Equivalent for \hookrightarrow, ↪
Of course I can simply type the unicode ↪, but is there a operator with no built in meaning that renders like this?
The documentation guide/ArrowsAndArrowLikeForms presumably lists all arrows. If it ...
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0
answers
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how to check inside a module if a symbol is local to the current module or global?
One way to check if a symbol is global is to do Context[x] and this will give Global if the symbol is in the global context. But ...
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3
votes
1
answer
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Partial derivatives in a variable name
I would like to create variable with names of the form \[PartialD]g and \[PartialD]\[PartialD]g. Is there any way to do this?
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0
answers
105
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Store pattern names in variables, and use them in Condition (/;)
I am trying to create patterns whose form is not hard-coded, and which are not explicitly directly written. For that I want to use one list of pattern names to name some parts of a ...
- 483
0
votes
1
answer
203
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How to use the Wolfram Language Symbol entity type to list all the entity types? [closed]
I would like to map EntityValue[#,"SampleEntities"] over all the domains of entities, but before I spend 20 to 30 minutes typing every single entity, I would like to be aware of any way to ...
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vote
1
answer
167
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Symbol compute of Euler-Lagrange equation
If i have the Lagrange density function $$L(x,\dot{x}) = \frac{1}{2}x^2+ \frac{1}{2}\dot{x}^2,$$
The Euler-Lagrange equation is very simple by
$$ \frac{d}{dt}\frac{\partial L}{\partial \dot{x}} - \...
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1
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339
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How can I self-define a keyboard entry for 3-dot "Because"?
In Mathematica, there already exists a keyboard entry for 3-dot "Therefore", which provides great convenience for input as shown below.
However, I find it a little odd that for its ...
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