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Questions tagged [built-in-symbols]

Questions related to handling built-in symbols and functions, for example why they behave a certain (possibly unexpected) way.

3
votes
2answers
160 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. ...
0
votes
0answers
22 views

Redefining the inbuilt function and its derivative [duplicate]

I want to redefine the DiracDelta functions and its derivatives. I am successful at redefining the DiracDelta function but not ...
2
votes
1answer
73 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
62 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
59 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
84 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 ...
10
votes
1answer
224 views

Who or what is named character Andy?

I suspect \[Andy] was meant to represent a staff member, or at least a person of importance. I tried the F1-"Wolfram Search", Wolfram|Alpha and a simple ...
10
votes
1answer
130 views

Why does Success[…][key] work and Failure[…][key] doesn't work?

I'm trying to figure out what is a quick way to add error reporting to my user defined functions. I was experimenting with Success and ...
3
votes
2answers
234 views

How to find the list of all the elementary functions in mathematica?

Is there any command to give me the list of all the embedded elementary functions in Mathematica like Cos Sin Cosh Sinh Log and so on?
3
votes
1answer
49 views

Is using Length more efficient than using === as stopping criterion?

I am using NestWhileList[ f[#, elems]&, pairs, Length[#1]<Length[#2]&, 2, Infinity, -1 ] to generate all suitable subsets from ...
0
votes
0answers
33 views

Create library of custom functions [duplicate]

I have been trying to create a library of custom functions that I could just call at the start of every notebook. For instance, say I want the following functions to be part of the Library, or even ...
5
votes
0answers
95 views

Not comprehending PowerMod

Bug introduced in 10.3 or earlier and persisting through 11.3.0 or later The bug is not present in 10.0. By definition, PowerMod[a, 1/r, m] finds a modular rth root of a mod m. Here's a pair of ...
1
vote
2answers
68 views

CountryData and RailwayGaugeLengths

Looking to see how to extract out just the length for this search: ...
1
vote
1answer
33 views

From algebraic symbols to symbolic functions

i have a code which gives an output of this kind: rrr=2*f+1; Now i define a simple function: f[x_]:=3*x+2; How should i do ...
0
votes
0answers
32 views

Mathematica does not recognize NestGraph

When I try to use the built-in command NestGraph, Mathematica doesn't recognize it. So it just outputs whatever I put in without doing anything. Do I need a special package for NestGraph?
0
votes
0answers
41 views

How can I simplify expressions correctly?

the final output of my code gives this expression which i call ttt: ...
1
vote
1answer
47 views

Substitution of expressions for the output

I have a code which gives this kind of output : W = Sum[v[j]*b[j], {j, 1, 3}]; AA = (v[1]*b[1] + v[2]*b[2] + v[3]*b[3])*2 + 3 ; I know that if i want to ...
3
votes
2answers
175 views

Transferring DownValues

I have a code in which I define something like this: cc[1, 2] = 1; cc[2, 6] = 12; cc[3, 7] = 3; After some manipulation I define a sort of temporary variable ...
1
vote
1answer
45 views

Setting to zero non defined array variables

I have a situation like this (for example): ...
4
votes
2answers
688 views

Replacing dot by *?

I am unable to replace dot by *. Replace[a.a, .-> *] Is there any solution to get this done?
5
votes
3answers
149 views

Power Function and Non Commutative Multiply

I'm trying to figure out the best way to define a Power function for non commutative multiply that retains some of the regular features of the ordinary power function. As of now, what I've been ...
3
votes
1answer
89 views

What does the $ sign do? [duplicate]

I saw this uses $, but it was not clear what does it do there. ...
6
votes
5answers
250 views

First evaluate in place all subexpressions matching pattern before substituting result

ReplaceAll[expr, {patt1:>rhs1, patt2:>rhs2, …}] works by looking for and making all possible replacements of subexpressions in ...
7
votes
3answers
518 views

Is there a built-in function to get the centroid of a table?

Suppose I have a table with some data that are 'lumped' around some central location, such as the dummy example ...
6
votes
2answers
153 views

How to create non-rectangular array with Array?

From the answers to this question, I learned that the recommended way to construct a symbolic sum of terms in an expression is to use Array. But I'm having a ...
1
vote
1answer
50 views

Low level built-in function to transpose expression (not array) [closed]

I have an expression like this F[G[1, b], G[3, y], G[4, y], G[5, u]] that I would like to Transpose to obtain ...
7
votes
2answers
148 views

Constructing expressions using Sum vs Array[… Plus] vs Plus@@Table[…]

For constructing a sum of terms which are symbolic, I noticed that in addition to ...
7
votes
2answers
269 views

How to obtain list of Installed Packages loadable by Get (<<)

When Get["MyPackage`"] is executed, Mathematica looks for a package in $UserBaseDirectory/Applications, and it does, it will ...
0
votes
0answers
26 views

Built-in function to know if a list is inside another? [duplicate]

For example, if the function is f[a_List,b_List] then in f[{a,b,c},{a,b}] and ...
1
vote
2answers
112 views

Is there an error pertaining to HypergeometricU function on functions.wolfram.com?

If one clicks on the last of the nine formulas on the Wolfram Functions site, one obtains ...
1
vote
1answer
56 views

any possible meaning to a “terminal” slash (/)? [closed]

I've been directed to the web page http://functions.wolfram.com/07.31.16.0001.01 The first statement in the formula is ...
4
votes
0answers
92 views

Crossing a symbol like p, similar to HBAR

Is it possible in Mathematica to cross a symbol like p, similar to h-bar, used to denote the Planck constant? Picture in case of font problems: In case of h, we have HBAR, inputted as ESC-hb-ESC ...
2
votes
1answer
37 views

Question related to IntegerPart

I am having trouble understanding the following result: Through[{IntegerPart,FractionalPart}[{100 4.02}]] {{401}, {1.}} ...
6
votes
2answers
645 views

How to take top 10 built-in function

WolframLanguageSymbol has a property named Frequencies, such as ...
4
votes
1answer
82 views

Is there a PartDelete like there is a TakeDrop

TakeDrop is nice because after taking a subarray, it also returns the remaining subarray. But it is limited in that the part specification can only be ranges, and ...
2
votes
1answer
62 views

Get polynomial terms

Is there a command equivalent to that of Coefficient to get the terms of a polynomial which are a power of the variables? For example: func[(x^3 + x)^2] {x^2, ...
1
vote
1answer
78 views

Functions aren't executed

Can't figure out why Mathematica doesn't want to execute built-in functions? What can be wrong? Input: ...
-1
votes
1answer
86 views

meaning of variable equal dot [closed]

I came across a program which I have written in a simplified form. For[i=1,i<100, i=i+1; func = a x^i; func=. ]; What is purpose of "func=."?
4
votes
3answers
311 views

Faster trace of product of two matrices

I noticed that for the computation of the trace of a product of two matrices, using Tr[Dot[A,B]] is a little inefficient. Dot ...
9
votes
1answer
236 views

Table of precedence values for all System` symbols

Has anyone created a table listing the precedences for all symbols? Also, it would be nice if there were a function that for a given precedence value or interval, returned all the symbols with that ...
1
vote
0answers
48 views

Wigner-D in MMA

Can some nice MMA fellow explain to me why buit-in Wigner-D function is defined as $D_{mm'}^{J} = e^{i(\phi m+ \gamma m')} d_{mm'}^{j}(\theta)$ against the convention, used by most people on Earth, ...
0
votes
1answer
134 views

How to prevent simplification from Times to Power?

By default, Mathematica simplifies Times[f[x],f[x]] as Power[f[x],2]. In most cases it's fine, but I happen to have a code where ...
4
votes
1answer
61 views

What does $UseTextSearchQ do?

Mathematica 11.2 features a new built-in symbol in the Global` context: Global`$UseTextSearchQ What does it do, and how do I ...
9
votes
1answer
185 views

1 is not the SameQ as Null, but why might 1 be Equal to Null?

The command SameQ[1, Null] returns False which is what I would expect, but the command ...
2
votes
1answer
159 views

Implement edge contraction function which respects vertex weights

It seems that built-in EdgeContract function doesn't work properly with weighted graphs, to be more precise, I mean that if I'm going to contract edge $e$ which ...
3
votes
4answers
183 views

What is the inverse of the Position function?

What is the inverse of the Position? I have an array which contains the positions of elements and I want a function which returns an List which contains 1 where ...
2
votes
1answer
101 views

How does one plot an oblique/slanted cylinder within the plot range?

A Cylinder does not seem to have an option to make it oblique. A Tube has an oblique center but does not seem to have an option to make the end caps oblique. One could plot a cylinder or tube that ...
0
votes
1answer
53 views

Why the export the Graphics or Image to local file [closed]

I note the Put cannot export the Graphics or Image,I mean this code will be failure. ...
5
votes
4answers
283 views

Mean of a list of lists (vector) with missing values

I understand, from Calculating the mean of a list with NaN values, that one can preserve structured data with missing values, and still calculate a mean, using ...
7
votes
1answer
320 views

Geometry computations add-on for Mathematica?

I came across the problem of calculating the circumcenters of triangles symbolically within another algorithm (as well as possibly doing other similar geometry computations). I was hoping Mathematica ...