Questions tagged [core-language]
Questions on the basic structure of the Mathematica language (Wolfram language) including atomic data types, syntax etc
543
questions
3
votes
1
answer
78
views
Extremely slow import of mx files with Molecule objects [closed]
Version: 13.0.1 on Linux
Hello,
I recently found a collection of 39,361 SMILES strings that I converted to Molecule format with Mathematica. I then exported the resulting list of Molecule objects into ...
- 483
0
votes
0
answers
46
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.
...
- 14.4k
0
votes
0
answers
36
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
<...
- 595
1
vote
1
answer
41
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
4
votes
1
answer
156
views
Is K is a function? [closed]
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,
...
- 1,815
3
votes
0
answers
64
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...
...
- 6,878
1
vote
0
answers
43
views
Molecule fingerprint MorganConnectivity
I am looking for a way to calculate the MorganConnectivity finger print for molecule object in Mathematica. v12.1 seemed to have an undocumented function MoleculeFingerprint
...
- 483
3
votes
1
answer
103
views
Differences between minimization functions?
There's more than 20 functions having to do with minimization
...
- 2,628
2
votes
3
answers
186
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 ...
- 649
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. ...
- 2,628
0
votes
0
answers
63
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 ...
- 727
0
votes
1
answer
62
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
79
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
134
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
56
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
45
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
...
- 1,047
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
41
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
487
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
61
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
73
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?
...
- 12.3k
2
votes
1
answer
88
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
89
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
293
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 ...
- 14.4k
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?
...
- 9,415
4
votes
1
answer
120
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
51
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
320
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. ...
- 12.3k
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}]];
...
- 654
1
vote
2
answers
85
views
What are the limitations of RecurrenceTable?
Background
Consider a recurrence relationship defined in terms of the following recursive functions (which works correctly):
...
- 2,360
3
votes
1
answer
101
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 ...
- 12.3k
1
vote
1
answer
57
views
Assiging Plot Range to Variables Works For X but Not Theta
Observe the following Mathematica code:
...
- 571
0
votes
2
answers
64
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 ...
- 571
1
vote
1
answer
29
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 <...
- 1,406
0
votes
0
answers
65
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 ...
- 12.3k
1
vote
0
answers
61
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 ...
- 648
0
votes
1
answer
71
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
113
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
21
votes
1
answer
437
views
What's the difference between these 2 associations?
I have 2 associations similar to these simplified ones:
...
- 19k
2
votes
0
answers
64
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 ...
- 403
1
vote
2
answers
139
views
'Do' loop acting on a global variable
I need a code that will allow me to alter a matrix (a global variable) iteratively using a function update (which depends on ...
0
votes
1
answer
47
views
Expression unexpectedly not evaluating to a numerical value [closed]
When I calculate the below, I get an unexpected output, not giving me the density, but rather a value M * ..
...
- 223
3
votes
2
answers
78
views
Basic replace with parameters questions
I have looked over MMA SE but seen nothing to help clarify this for me.
what I want to do is set some parameters for a curve, and then I want to automatically replace the x,y,z of, say, a vector field ...
- 105
17
votes
1
answer
379
views
Broken ValueQ function in Mma12.2?
f[x] ^= 1;
ValueQ[g[x]]
returns True in Mathematica 12.2. Is it a bug?
- 631
1
vote
0
answers
36
views
How to Inherit Arrowheds size?
I'm trying to write a Module that produces some arrows with custom Arrowhead shapes. However, I want the code external to the <...
- 1,406