Questions tagged [system]

Questions on implementation details and how the parts of Mathematica are arranged or configured to work. Avoid this tag for issues that are confined to a specific operating system.

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How the function NDSolve works? [closed]

I am trying to numerically solve a system of ordinary differential equations. ...
Viktoriya Kukanova's user avatar
1 vote
1 answer
49 views

Error in using the function NDSolve [closed]

I am trying to numerically solve a system of ordinary differential equations. ...
Viktoriya Kukanova's user avatar
1 vote
1 answer
38 views

Exported function discovery with LibraryFunction

Many internal calls boil down to invocations like LibraryFunction["path/to/library", "funcName" , ...] I'm on a mac, so I can use the ...
Adam's user avatar
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1 vote
1 answer
156 views

How do you Solve a Simultaneous System of Recursions

Consider the following system of simultaneous recursions: r[n] == s[n-1] s[n-2] == r[n-3] I am tring to solve this system (I have given a vastly simplified ...
Russell Jay Hendel's user avatar
0 votes
0 answers
47 views

Solving matrix system of ODE coupled to a non linear PDE (Reynolds)

I am trying to solve the following problem for $p$ (the pressure) between a piston skirt and a cylinder lining. This depends on the secondary motion of top and bottom of the piston skirt $e_t$ and $...
Martin's user avatar
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1 vote
0 answers
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Problems when solving a system of PDEs with NDSolve

I am currently attempting to solve the following exercise question using NDSolve directly (ref.: Davis, M. E. (2013). Numerical methods and modeling for chemical engineers. Courier Corporation.). ...
Al Mossar's user avatar
7 votes
1 answer
126 views

Get All Discrete Univariate Distributions with Symbolic Parameters

I am trying to get all Discrete Univariate Distributions with symbolic arguments from any place in Wolfram Language system. For example this guide: http://reference.wolfram.com/language/guide/...
Vitaliy Kaurov's user avatar
1 vote
0 answers
61 views

What is the orange color symbol in the new line? [duplicate]

In mathematica v 13.1 , If I type + key of my keyboard in a new cell, I see What is it? Also if I type + twice in a new cell, ...
imida k's user avatar
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4 votes
1 answer
107 views

Notebook magnification - two independent values

It seems there are two independent, equally influential values those control mathematica notebook magnification. Just like volume bars in a certain media player(program) and volume bar in tray bar(...
imida k's user avatar
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3 votes
1 answer
82 views

Parallel computing doesn't use my own settings

To differentiate the conjugate of a function, I used such settings. ...
rpark's user avatar
  • 51
1 vote
1 answer
78 views

Use output of Solve as input of another instance of Solve. How to deal with list of rules

I am a complete novice with Mathematica. The last line of the code that I report is a system of equations I'd like to solve (and I am sure it admits a unique solution): (I don't know how I can convert ...
Matteo Bulgarelli's user avatar
5 votes
0 answers
64 views

Why does Length[Names["System`*"]] give different values on Windows and Linux?

I was just curious about this. Length[Names["System`*"]] Gives slightly different value on Linux and Windows 10. I was wondering why that is as I have ...
Nasser's user avatar
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6 votes
1 answer
220 views

Documentation Search : google-like (pokygon -> polygon)

If you search for "pokygon" in google.com, then google automatically fix error, and searches for "polygon". Like google.com, if you search for "pokygon" in mathematica (V ...
imida k's user avatar
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1 vote
0 answers
56 views

Entire process of "hyperlink of paclet" to "location of real file"?

Hyperlink[AAAAA, "paclet:ref/ModularInverse"] AAAAA If I click AAAAA, then a tutorial notebook for ModularInverse.nb ...
imida k's user avatar
  • 4,047
2 votes
1 answer
160 views

How do I know which kernel is handling which .nb file? [closed]

OS : window 10 Mathematica : v12.2 By my mistake, I opened another mathematica kernel, not knowing a kernel was already running. I created a lot of .nb files and worked on them in another kernel, ...
imida k's user avatar
  • 4,047
0 votes
0 answers
21 views

Replacing System` definitions in a context whilst still maintaing acces to them [duplicate]

Given the system operator TensorContract I can define a new one, TensorContractLazy with the attribute ...
user3257842's user avatar
3 votes
3 answers
185 views

Quit the loop if encounter error message

First define length-component error (personal term) : This is an error when we want to get n-th component of a list if n is bigger then the length of the list. For example, ...
imida k's user avatar
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1 vote
1 answer
78 views

Edit UnicodeCharacters.tr-File

I want to install a new package in Mathematica. If I understand the userguide right, I also have to edit the UnicodeCharacters.tr-File by another *.tr-File for example containing 0x2219 [...
Joju127's user avatar
  • 11
1 vote
0 answers
70 views

Error message window upon launching Mathematica

Upon launching Mathematica (v. 11.3) I always get the Messages window with "An unknown menu command token (RebuildHelpIndex)...", as shown below. How do I eliminate that?
David G. Stork's user avatar
1 vote
1 answer
47 views

Temporarily prevent/allow exporting to specific folders

Is it possible to temporarily Q1) prevent exporting to specific folders ? Q2) allow exporting to only specific folders ? Whenever mathematica is about to process ...
imida k's user avatar
  • 4,047
2 votes
2 answers
267 views

Reduce and Solve are taking forever

I am running the following script to solve a system of equations. However, it has been running for 12 hours by now with no output. Is this typical? What is happening? Is there anything wrong with how ...
Morcus's user avatar
  • 247
0 votes
1 answer
90 views

How to use Reduce to solve matrix/vector equation

Suppose $A$ is an $2 \times 2$ matrix of unknowns, and $x$ is an $2 \times 1$ vector of unknowns. How can I use $A$ and $x$ as variables to be solved for in Reduce or FindInstance? example given a ...
Morcus's user avatar
  • 247
0 votes
1 answer
83 views

Solving complicated linear system [closed]

I have this system and I would solve it with mathematica, I try with the instruction Solve but I have an error Please help me.
Espoir's user avatar
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2 votes
0 answers
76 views

Solving a system of four non-linear differential equation

Could someone help me with my problem? I've been scratching my head over this for a day now. I can't write the right code to solve this non-linear differential equation system: ...
TEMS's user avatar
  • 21
4 votes
2 answers
457 views

Multiplication of one big integer and a long list of integers - fast

This is an example of multiplying a big integer to a list of integers. ...
imida k's user avatar
  • 4,047
0 votes
0 answers
113 views

Plot a system of differential equations

I would like to plot the solutions to the system of ODEs that is written below: ...
Agaph's user avatar
  • 101
2 votes
0 answers
96 views

Read Mac Touch ID In Mathematica

Apple seems to provide some support for developers to authenticate users biometrically with the touch id sensor in the form of a swift API (see here). I'm wondering if there is an easy way to do this ...
user2757771's user avatar
3 votes
3 answers
272 views

Solving for a unique set of solutions

I have the following code: ...
Jan Eerland's user avatar
  • 1,941
1 vote
1 answer
151 views

System of PDE with integration conditions interior of domain

I am trying to solve this system of pde numerically. I am unable to find any method in Mathematica that can handle this problem. The issue is having this integration condition in the domain. I tried ...
mathfun's user avatar
  • 103
3 votes
0 answers
106 views

System`Private`*Entry* and *Valid*, or: How does Mathematica know which expression is which?

Goal The answers to this question are intended to be a place to describe the behavior and mechanism of the undocumented functions of the form System`Private`*Entry* ...
thorimur's user avatar
  • 8,980
5 votes
2 answers
880 views

I believe Beep uses the system sound which is obnoxious and rude. How does one create a friendlier less intrusive sound?

Beep is a terrible sound for alerting when a background task has successfully completed. It was primarily designed for errors or when a task fails. That's why it's ...
Jules Manson's user avatar
  • 2,407
3 votes
0 answers
58 views

Definition of large expression - makes PC freezed

In[1] A=Range[10^4];?A Out[1] (* definition of A*) It works for 10^4. But if I increase the number to 10^6 ...
imida k's user avatar
  • 4,047
1 vote
3 answers
255 views

How solve this nonlinear equations system by 12 unknowns?

We consider the following integral equation of mixed type: $x[t]=\frac{t^4}{6} -\frac{t^3}{3} +t+\Sigma_{\mu=1}^2\int_{0}^t k_\mu[t,s]G_\mu[s,x[s]]ds ,0\leq t\leq 1 $ ; (1) where $k_1 [t, s] = s^3$...
user68119's user avatar
5 votes
1 answer
249 views

How to run wolfram code from the finder in macos?

I'd like to run wolfram code (probably a .wls script) on a file or set of files by selecting them in the finder and using Right-click > Services. For example, ...
M.R.'s user avatar
  • 31.2k
1 vote
1 answer
84 views

About Blue Screen of Windows System after starting Mathematica 12.2/12.1 Win10

After starting Mathematica, My computer will Blue Screen. Mathematica version is 12.2 win10. An error of Win10 shows ...
shrocat's user avatar
  • 189
2 votes
2 answers
2k views

Solving a non-linear system of equations symbolically [closed]

How would I solve this systems of non-linear equations symbolically: $$ \mu N -\frac{\beta S I}{N} - \nu S = 0 \qquad (1)$$ $$\frac{\beta S I}{N} -\gamma I - \nu I = 0 \qquad (2)$$ $$\gamma I - \nu R =...
Math's user avatar
  • 407
2 votes
0 answers
108 views

Read newer version of Mathematica file

I am not sure if this question is silly, but I have the Mathematica version 12.1 and my friend has the Mathematica version 12.0 and he cannot read my files. How can I save the files in the version 12....
John's user avatar
  • 1,581
0 votes
1 answer
215 views

Solve system of 5 unknowns and 5 nonlinear equations

I attached below the system of 5 equations that I am not able to solve using FindRoot. I also tried without defining the equations as functions but It didn't work. ` ...
carlo antonello's user avatar
1 vote
0 answers
44 views

Standalone Kernel No input available

I have encountered the same problem as the thread attached. Mathematica stuck in "running" for every calculation I attempt, kernel error However, when I try to launch a standalone kernel ...
may14's user avatar
  • 11
1 vote
0 answers
41 views

Get a system from a array of expressions [closed]

I have an array of expresions like: A = {x+y-5, x-y-1} I need to set all expresions to zero (transforming each expression into a function) and turn it into a ...
user70148's user avatar
1 vote
1 answer
52 views

What is my current scope if I change `Inspector>Cell options>Evaluation options>CellContext` to "Notebook"?

I mean I made this change: Now, Clear["Global`*"] and Names["Global`*"] are not working anymore. I tried ...
vasili111's user avatar
  • 1,163
2 votes
0 answers
53 views

When making a package, how can I make a function that is already used by system?

Obviously, Plus[a,b] is given by Mathematica but say I have a package and I want to name a function Plus[a,b]. How can I go ...
Brandon's user avatar
  • 101
2 votes
0 answers
57 views

Can Mathematica be set to remind user to save after a set number of unsaved edits have occurred or after a set amount of time has passed?

I lost half a night's work just now because after about 6 months of learning and working with Mathematica it finally decided to crash on me for the very first time. Yeah my bad. At least I can ...
Jules Manson's user avatar
  • 2,407
3 votes
1 answer
126 views

Cannot find a way to close a toolbar. I believe it's the Templating toolbar

Today I was looking at the menu: Windows > Toolbar > Templating (and the others) which I was able to toggle show/hide but this one refuses to toggle. I hope I am not stuck with it. I noticed that ...
Jules Manson's user avatar
  • 2,407
26 votes
6 answers
830 views

Is mathematica adequately improving?

A bit of a loaded question, but in your opinion is Wolfram's team making good progress on improving their software? I've used Mathematica for almost 10 years now, and honestly I'm personally ...
Steven Sagona's user avatar
2 votes
2 answers
49 views

System of Differential Equations discrepancy

Using the following code in Mathematica: ...
Ashish's user avatar
  • 77
2 votes
0 answers
70 views

How might one deal with a run-away job, short of "force quitting"?

I've done some miscoding, and I'm in a loop that's producing output quite rapidly. So, it seems that I can't really get the Abort Evaluation or Quit Kernel options to "take". Of course, I can Force ...
Paul B. Slater's user avatar
1 vote
2 answers
148 views

Solving a big system of equations using certain conditions

I have the following problem: I want to solve a big system of equations for a certain number of variables which I call $a_k$, the variables need to satisfy the following conditions: all $a_k\in\mathbb{...
Jan Eerland's user avatar
  • 1,941
3 votes
1 answer
75 views

Upvalues of modified system functions

Suppose that someone (e.g. the author of a package I need to use) modifies the upvalues of a system function in the following way ...
vsht's user avatar
  • 3,497
2 votes
0 answers
36 views

Possible to add a `Find "string"' to the Toolbar?

It would be nice to have a persistent "Find" feature on the tool bar. I find the FindAndReplaceDialog to be clumsy on MacOs. I could do this with a DockedCell, but then I would need to do it for ...
Craig Carter's user avatar
  • 3,968