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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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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0 votes
1 answer
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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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  • 123
0 votes
1 answer
62 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.
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2 votes
0 answers
59 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: ...
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4 votes
2 answers
344 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. ...
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0 votes
0 answers
91 views

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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2 votes
0 answers
92 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 ...
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3 votes
3 answers
243 views

Solving for a unique set of solutions

I have the following code: ...
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1 vote
1 answer
79 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 ...
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3 votes
0 answers
52 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* ...
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5 votes
2 answers
848 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 ...
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3 votes
0 answers
56 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 ...
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1 vote
3 answers
191 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 $k_1 [t, s] = s^3$...
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0 votes
0 answers
43 views

Run .exe file from Mathematica with another file as argument

I'm dealing with three files in my project : A mathematica Notebook containing all the properties for the calculation which generates a .inp file A .inp file (Input for the .exe file) A .exe file (...
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5 votes
1 answer
184 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, ...
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1 vote
1 answer
61 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 ...
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0 votes
0 answers
57 views

Solve a system of slope-intercept, ODE, and PDE with spatial and time variable

I am new to Mathematica and I need to solve a system of coupled ODE and PDE with two variables (space and time) and one of the parameters is only dependent on the space. The set of partial ...
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1 vote
2 answers
226 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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2 votes
0 answers
69 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....
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0 votes
1 answer
167 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. ` ...
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1 vote
0 answers
36 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 ...
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1 vote
0 answers
37 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 ...
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1 vote
1 answer
37 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 ...
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2 votes
0 answers
52 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 ...
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2 votes
0 answers
56 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 ...
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3 votes
1 answer
83 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 ...
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  • 1,787
24 votes
5 answers
539 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 ...
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2 votes
2 answers
47 views

System of Differential Equations discrepancy

Using the following code in Mathematica: ...
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2 votes
0 answers
51 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 ...
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1 vote
2 answers
101 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{...
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  • 1,723
3 votes
1 answer
60 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 ...
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  • 3,302
2 votes
0 answers
35 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 ...
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1 vote
0 answers
50 views

Converting an .rtf file to a .nb file without data loss

I unfortunately had a notebook have a syntax error and I would have lost weeks of work. To fix this, I was able to save my old notebook as a .rtf file without any excessive data loss. When I convert ...
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1 vote
1 answer
1k views

Gauss-Seidel method

I am trying to solve a system of equations with Gauss Seidel method.I reached this point but there is some problem,and I can't find a result.This is the system. ...
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2 votes
0 answers
111 views

Difference between versions of WolframScript

On my computer (Windows 10) I currently have installed 4 instances of wolframscript.exe. They represent different versions of WolframScript program and each file is ...
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3 votes
1 answer
85 views

Automatically load init.m without sharing CellContext

I'm trying to set up Mathematica such that all functions/variables defined in my init.m are automatically loaded into any new notebook I open. This works as a default, but I would also ideally like to ...
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0 votes
0 answers
35 views

Differential equations system's solutions differ when one of the constant is 0

I am solving the following system of equations with Mathematica. $u'=-k_{1}ux+k_{2}x^2, x'=k_{1}ux-k_{2}x^2$ and I obtain the solution for x: $x(t)=\frac{e^{k_{1}C_{1}(t+C_{2})}k_{1}C_{1}}{-1+e^{k_{1}...
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0 votes
0 answers
28 views

Printing problem Mathematica v12

After installing MMA v12 (Windos 7) I cannot print (using Print) on several printers, which work fine together with other programs. If a use ...
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4 votes
3 answers
247 views

Writing a program that will filter the integer solutions

I've the following equation: b==(-12 + Sqrt[3] Sqrt[ 3 (-4 + r)^2 + 12 a^2 (-2 + r) - 4 a (-5 + r) (-2 + r) + 4 a^3 (-2 + r)^2] + 3 r)/(6 (-2 + r)) ...
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3 votes
0 answers
643 views

Mathematica 12 blurry with High DPI 4k screen [closed]

Same as here. Everything very blurry. Maybe there is any new solution for Mathematica 12 under Windows 10?
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  • 973
0 votes
1 answer
188 views

FindRoot: Power: Infinite expression 1/0. encountered

I am trying to solve the problem below with FindRoot. At first it works well, but when I change the constants in my equation the solver returns with the message: ...
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6 votes
1 answer
60 views

Why does `$Pre` need to be defined indirectly via some other function?

The documentation for $Pre gives the following example ...
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7 votes
0 answers
113 views

How useful is $SynchronousEvaluation?

Example SessionSubmit @ Print @ $SynchronousEvaluation Will print False even though ref/SessionSubmit/Details last point: ...
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  • 132k
1 vote
0 answers
82 views

Passing custom options to WolframScript file

I have an example of WolframScript file file.wls with the following contents. ...
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  • 6,373
2 votes
0 answers
528 views

Any possible explanations for repeated "out-of-the-blue" crashing of Mathematica 12? [closed]

This is a further development in this "saga". After originally asking the question below (which I will delimit with dashes) a number of months ago, I did get a reponse from Wolfram Technical Support:...
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-2 votes
1 answer
87 views

Overdetermined equation system

how can I solve this overdetermined equation system with the command PseudoInverse. left = Table[(-i)^i, {i, 1, 4}]; right1 = Table[Sum[2^(i*k)*Sin[Subscript[x, k]], {k, 1, 3}], {i, 1, 4}]; <...
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8 votes
0 answers
65 views

Dealing with over eager shadowing messages

...
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  • 132k
8 votes
0 answers
110 views

Current $Context of a given notebook

nb = CreateDocument[{Dynamic@$Context}, CellContext -> Notebook] It will show Notebook$$22$93500` or something similar. How ...
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  • 132k
8 votes
1 answer
1k views

3.4 GHz Ryzen 5 slower to diagonalise large matrix than Intel i5-6300U 2.4 GHz

Sorry that this is quite a specific question but I need to diagonalise large matrices for the problem I'm trying to solve and can't for the life of me work out what's going on: I was expecting that ...
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0 votes
0 answers
97 views

Mathematica can't solve system of equations

I'm trying to solve an admittedly gnarly system of equations: ...
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  • 343