All Questions
Tagged with undocumented internals
18
questions
0
votes
1
answer
98
views
Question about System`MeijerGDump`* [closed]
Steps
Start a fresh kernel, then copy the below sentence, run it.
...
- 1,593
5
votes
2
answers
289
views
What do the arguments of a generated BSplineFunction mean?
For example, if we evaluate this:
BSplineFunction@{{0,100},{200,50},{200,0}}
we'll get
...
- 3,740
2
votes
1
answer
66
views
How to use System`Private`AssumptionAccess and Assumptions`*?
I see this function is used by some symbols in Assumptions`*, and it HasDownCode and does not ...
- 3,740
2
votes
1
answer
276
views
Internal`CopyListStructure makes fatal error sometimes
Warning : At least in my PC (windows 10, mathematica V12.2), some of the codes here led to fatal error.
Fatal means mathematica will freeze + 'Abort Evaluation' will not work. I had to quit the kernel ...
- 4,315
8
votes
1
answer
191
views
Can we construct our own NDSolve`StateData?
NDSolve can be broken into three stages:
NDSolve`ProcessEquations processes the equations and sets up an NDSolve`StateData ...
- 20.3k
3
votes
1
answer
237
views
What is the most reliable way to find a particular function?
I learned there're built-in functions which is not documented from this question.
After this , I tried looking for something which is usable for me,then noticed that with ...
- 1
8
votes
2
answers
348
views
How to convert a RawArray of bytes to ByteArray?
A ByteArray can be converted to a RawArray:
...
- 236k
9
votes
1
answer
242
views
What's purpose of the Internal`ToEquivalenceClass [closed]
There is a kernel function Internal`ToEquivalenceClass.I don't know how to use it.There are some right example right to run
...
- 26.9k
3
votes
1
answer
121
views
What does the return value of Internal`ArgumentCountRegistry mean?
Internal`ArgumentCountRegistry sometimes will give a value about some function.Such as
...
- 26.9k
4
votes
0
answers
98
views
Optimization`FindFit`ObjectiveFunction and PenaltyFunction
Consider the following toy example:
model = a Cos[w t];
data = Table[{t, Cos[2.1 t]}, {t, 0, 10, .25}] + RandomReal[.1, 41];
as both an unconstrained problem:
<...
- 8,499
5
votes
1
answer
292
views
What's purpose of function System`Private`LookupCodeByName and System`Private`LookupNameByCode [closed]
These are useful function from their name.And they are kernel function since:
...
- 26.9k
35
votes
1
answer
1k
views
How can I work with RawArray?
RawArray seems to be able to efficiently hold integer and floating point data of various sizes.
What is RawArray good for? How ...
- 236k
2
votes
0
answers
115
views
Internal`LocalizedBlock doesn't support Protected symbols and emits weird messages
Protect[x];
Internal`LocalizedBlock[{x[0]}, x[0] = 1; x[0]]
...
- 5,739
3
votes
0
answers
164
views
What does System`Private`GetContentCode do? [closed]
I just came across this strange function.
It is next to GetRefCount and functions like HasDownCodeQ, so it may be something ...
- 541
2
votes
0
answers
106
views
Where can I find tutorials or examples about Internal` packages and other useful packages? [duplicate]
As an intermediate level Mathematica user, I consider one of the greatest barrier on my way to a higher level of programming is the lack of knowledge about extra packages like Internal` package or ...
- 9,630