Questions tagged [core-language]
Questions on the basic structure of the Mathematica language (Wolfram language) including atomic data types, syntax etc
548
questions
5
votes
1
answer
76
views
FindIsomers produces disconnected fragments
I was playing around with FindIsomers and got this strange result,
FindIsomers[Molecule["butane"]]
output
This seems unexpected in the sense that you ...
- 623
0
votes
0
answers
107
views
Codewars and Mathematica
I looked up the Wolfram Language on Codewars as the site is great to improve coding.
WL is not among the listed languages (I checked the beta versions as well). I assume this is because the language ...
- 1,286
19
votes
1
answer
744
views
When did this global rules change happen in Mathematica? Is this change documented?
In this Wolfram talk video titled "Professor Richard J. Gaylord's Wolfram Language Fundamentals Part Two" he shows at time 36:45 the following
Where there are two definitions for ...
- 116k
4
votes
2
answers
201
views
What should mapping over a number or symbol produce?
I expected it to be an error (i.e., produce an error message), but Map[f,num] is num. Why is this the correct behavior? If it is ...
- 12.7k
4
votes
0
answers
68
views
What are some basic references for learning "box language" and further mathematica language customization techniques? [duplicate]
I'd like to be able to understand and write mathematica code that is able to customize in some way the output of mathematica in notebooks, for example. I believe I need to learn the so called ...
- 41
3
votes
1
answer
168
views
BUG - Different Cloud vs. Desktop Return behavior in V13.1 [duplicate]
After install V13.1 one of my scripts get broke in my Mac. Here is the bug:
Module[{}, Return[1]; 2]
Return[1]
When I tested ...
- 25.6k
11
votes
2
answers
449
views
How can I create an atomic head or treat some head as atomic during Map?
For example,
Map[g, {0, {h[1, 2, 3]}}, {-1}]
gives
{g[0], {h[g[1], g[2], g[3]]}}
I want a ...
- 16.4k
0
votes
0
answers
47
views
Evaluation involving complex conjugates
I was trying to write an expression involving Conjugate. To create a minimal example, however, I have reduced it down to these expressions.
...
- 19.2k
0
votes
0
answers
40
views
Extracting function domain from a finite set of assignments
Suppose we define a function through a finite collection of equalities, e.g.,
f[1] = 1; f[26] = 321
and so on. We can extract the set of output values by running
<...
- 605
1
vote
1
answer
43
views
How to define the `Length` property of some expensive function (UpValues, DownValues and order of execution confusion)
I want to define the Length property for some function that is computationally expensive and returns a list. So if the function is ...
- 2,791
5
votes
1
answer
208
views
Is K is a function? [duplicate]
Some of the capitalized single letters are functions. Starting a fresh kernel and typing in the 24 capital letters, the following letters turn black since they are special functions,
...
- 1,967
3
votes
0
answers
68
views
Problem with Mathematica Relationship Building
When I enter the following to get Mathematica to open my pod door I get
Could someone try and replicate this? Also, my name is not Dave and I throw my own error...
...
- 6,978
3
votes
1
answer
118
views
Differences between minimization functions?
There's more than 20 functions having to do with minimization
...
- 3,099
2
votes
3
answers
199
views
How to map integration and multiplication to a serie?
*For further study of series, they can be put into a different form.
Normal[Series[1/(1 - x), {x, 0, 10}]]
This serie 1/(1-x) = 1 + x + ... ,must be first ...
- 659
0
votes
0
answers
38
views
What is OLEData? VectorGlyphData?
System`OLEData is a symbol, and I only see it referenced in syntax highlighting lists online.
Same for System`VectorGlyphData. ...
- 3,099
0
votes
0
answers
75
views
How can I add such objects as three dots and plus
What kind of objects do the red arrows point to in the following images?
Things like the "Three dots plus". What is the name of this object and how do I insert it? And also the second ...
0
votes
0
answers
37
views
Adding new functions globally [duplicate]
Perhaps this is bad practice, but I'm wondering if it's possible to create my own Mathematica functions and make them equivalent to core functions (i.e they are available in any notebook/kernel ...
- 819
0
votes
1
answer
64
views
Applying pure function to an association, why the square brackets? [closed]
I'm studying the wolfram guide and I'm trying to figure out why the square brackets on the right side:
...
- 518
4
votes
1
answer
90
views
Creating a Graph of related entities with the data from Wikidata
I've a list of Entities from Wikidata
...
- 518
5
votes
1
answer
135
views
How can I remove First[{}] from the output list of a function?
Consider:
listOfKeys = {"Ambientalismo", "Anoressia"};
list2 = First /@ (WikidataSearch /@ listOfKeys)
I've tried
...
- 518
0
votes
1
answer
86
views
How to get a specific element from a list {a, b, c, d}? [closed]
For example, I have x ={11,12,13,14}, how do I get the element staying at the third place, that is, 13?
- 39
0
votes
1
answer
48
views
Program works, but then fails when I write it inside Module [duplicate]
I'm new to Wolfram Language; I'm trying to get used to it by writing a bunch of code and programs, being one of them the algorithm for the bisection method.
When I write the algorithm outside of a ...
6
votes
3
answers
1k
views
Can someone tell me what's wrong with this nested IF? [duplicate]
I have written a very simple nested If as follows
...
- 1,099
1
vote
0
answers
53
views
Outer vs Tuples, what's the meaning of this sentence from the Wolfram ref? [closed]
Results from Outer involve extra sublists:
...
- 518
0
votes
1
answer
44
views
Distribute an operation on the cartesian product of two sets
I've been trying some different approach but all are not working:
I've got 2 polls, the first with 2 options (and 2 list of people which voted each option), the second with 3 options (and 3 list of ...
- 518
18
votes
3
answers
508
views
Difference between HashTable datastructure and Association datastructure
Is there a difference in the runtimes between CreateDataStructure["HashTable"] and <||> in terms of inserting, ...
- 558
0
votes
0
answers
63
views
Is SetDelayed creating Functions?
I was trying to create a named function using a short syntax (I mean avoid writing Function[]). I thought SetDelayed was the short for Function[], but then I had some issues and realized that maybe #x ...
- 518
0
votes
1
answer
60
views
What's the meaning of TypeSystem`Atom and TypeSystem`Vector?
SemanticImport is probably failing to import the data. In fact the log message is transformed into this weird entity.
Dataset[List["Error calling Sogei service http://lb-ven-onl-psqf.winco.local/...
- 518
4
votes
1
answer
75
views
How can default valued be added in a Query?
I'm not understanding the the default values are not used to produced a length of 0 in the following example. What is the right way to add default values during a query?
...
- 12.7k
2
votes
1
answer
89
views
Can I tell whether a symbol is build-in (part of the System` library)?
I'd like a function that checks whether a symbol is a predefined part of the language or not. More generally, it might check whether it's part of a given package.
...
- 862
4
votes
1
answer
93
views
Making a rule that only applies when the expression is NOT an argument?
I know we can make rules of the kind:
magic/:f_[x___,magic[a_],y___]:=f[x,arg[a],y]
This will replace magic[a] by ...
- 862
-1
votes
1
answer
343
views
Keywords for the Wolfram Language [closed]
For a programming language, certain keywords are reserved; i.e., these tokens can't be used in any other context while programming in that particular language.
Here is a list of C language keywords ...
- 19.2k
3
votes
1
answer
116
views
Why do these two calls to Apply return different results?
In the following example, why do these two calls to Apply return different results?
...
- 9,505
4
votes
1
answer
124
views
Alternatives in pure function construction
When I declare a function f in the following form:
f[a|b] := 1
then I can use it like:
...
- 333
3
votes
1
answer
44
views
Type formation rules for 1-position expressions
I made a summary of the rules for formation of types for simple 1-position expressions, as I understand them.
Here it is in textual form:
A symbol, say, α, is a discrete entity, represented by a ...
- 333
0
votes
1
answer
55
views
Debugging code with Plot function. Full details
This is some code:
The first plot (with the f[x,3]) gives me a graph.
The second plot (with the 'numerical' form of f[x,3] given) does give me a plot
How can I fix this so that the first line gives me ...
- 203
11
votes
1
answer
339
views
What is the relationship between the Wolfram executables? Where is this documented?
The relatively new wolframscript now accompanies the traditional math and wolfram binaries. ...
- 12.7k
3
votes
3
answers
138
views
How to swap SetDelayed expressions?
Suppose, there are two delayed expressions
D1:= RandomVariate[UniformDistribution[{-1, 0}]];
D2:= RandomVariate[ UniformDistribution[{0, 1}]];
...
- 704
1
vote
2
answers
90
views
What are the limitations of RecurrenceTable?
Background
Consider a recurrence relationship defined in terms of the following recursive functions (which works correctly):
...
- 2,370
3
votes
1
answer
125
views
Conditional Output of Solve as a piecewise function
I am solving a set of equations, and Solve gives me (as expected) conditional assignment rules. Now I would like to define a piecewise function with that output, and use both the solutions and the ...
- 117
2
votes
1
answer
44
views
alternative approaches to selecting elements from two vectors conditional on a third
The following will convey the idea: build a new vector based on an existing condition (boolean) vector. For simplicity, I'll build the conditioning vector (cond) in ...
- 12.7k
1
vote
1
answer
59
views
Assiging Plot Range to Variables Works For X but Not Theta
Observe the following Mathematica code:
...
- 591
0
votes
2
answers
85
views
Create list of functions, domains, and iterate over (compare to Python code)
In Mathematica, I want to do a mass export of many different animated plots of specific functions with different domains. Because I don't necessarily want the plots to always have exactly the same ...
- 591
1
vote
1
answer
32
views
Substitute a function
In the following code, I'm trying to substitute Sin[x] for f[x]. What's the right way to do it so that f'[x] gets replaced with <...
- 1,446
0
votes
0
answers
90
views
What is the best way to remove dataset rows with missing values?
Consider a rectangular dataset produced by SemanticImport from a CSV file where the first row has the headers. Some values are Missing. I want to delete all the ...
- 12.7k
1
vote
0
answers
71
views
Intervals v.s. Domains: when to use which and why?
or: How to use Interval correctly?
Mathematica provides these constructs for various symbolic deductions tasks. Among those constructs are symbolic number sets ...
- 678
0
votes
1
answer
72
views
Strange little bug: Simple real number replaced by Times[0.805`, \.00] [closed]
I had a bug in my code which I tracked down to the simple number 0.805. So I looked at the FullForm of this number and I got
Times[0.805`, \.00]
It isn't a big ...
- 285
1
vote
0
answers
161
views
Converting negative value to zero [closed]
I would like to convert the negative outcome of $r_2$ to zero. I have used the following code, but it still gives me a negative value. Is there any option to turn the negative outcome directly to ...
- 113
22
votes
1
answer
468
views
What's the difference between these 2 associations?
I have 2 associations similar to these simplified ones:
...
- 19.5k
2
votes
0
answers
66
views
Should I redefine 0^0 [duplicate]
I've found some times, while playing with combinatorics, that Mathematica can't calculate some functions because $0^0$ is not defined as $1$.
(I know that some people think that $0^0$ should be left ...
- 413