# 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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### 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 ...
1 vote
154 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 ...
44 views

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 $... 26 votes 6 answers 797 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 ... 47 votes 3 answers 3k views ### What are all the "magic" symbols in the Mathematica language? Leonid Shifrin once wrote (excerpted): (Unevaluated) is one of a very few "magic symbols", along with Sequence and <... 1 vote 0 answers 38 views ### 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.). ... 9 votes 1 answer 121 views ### Dealing with over eager shadowing messages ... 7 votes 1 answer 123 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/... 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, ... 4 votes 1 answer 103 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(... 30 votes 5 answers 8k views ### Mathematica 11 with High DPI 4k screen My laptop has a 17 inch 4k screen, running Windows 10 and Ubuntu 1604. Both systems are set to 2x scaling. But Mathematica 11 (released 2016-08-08) is still blurry like version 10. Is there a simple ... 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. ... 1 vote 1 answer 74 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 ... 5 votes 0 answers 61 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 ... 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 ... 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 ... 2 votes 1 answer 156 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, ... 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 ... 3 votes 3 answers 166 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, ... 0 votes 1 answer 488 views ### How to permanently modify the$Path in Mathematica [duplicate]

I was trying to add permanently a path inside $Path. "/Users/Softwares/HEP_Softwares/MT-1.0" Following$Path manual I did the following ...
1 vote
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### 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 [...
2k views

### Recursion depth of 1024 exceeded during evaluation of a complex substitution [duplicate]

I am trying to do the following : How do I obtain an expression for $\epsilon$
1 vote
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### 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?
1 vote
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### 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 ...
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### Paclets updating awareness and tracking

Edit From the author of this question This question is obsolete Since 2016 there is a lot of new stuff concerning Paclets. They are now documented. End of the Edit It turns out that some silent ...
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### 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 ...
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### 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 ...
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### 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.
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### 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: ...
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### 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. ...
58 views

### Definition of large expression - makes PC freezed

In A=Range[10^4];?A Out (* definition of A*) It works for 10^4. But if I increase the number to 10^6 ...
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### Plot a system of differential equations

I would like to plot the solutions to the system of ODEs that is written below: ...
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### 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 ...
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### Solving for a unique set of solutions

I have the following code: ...
1 vote
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### 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 ...
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### SystemPrivate*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 SystemPrivate*Entry* ...
874 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 ...
268 views

### NotebookEvaluate breaks notebook's context

Bug introduced in 10.4.1 or earlier and persists through 12.0 A support case with the identification [CASE:3813108] was created [...] I have forwarded an incident report to our developers with the ...
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### 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, ...
1 vote
234 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 $k_1 [t, s] = s^3$...
1 vote
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### 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 ...
1k 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 =...
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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....
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### 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.  ...
1 vote
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### 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 ...
1 vote
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### 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 ...
1 vote
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### 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 ...
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 ...