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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52 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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2answers
101 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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0answers
65 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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84 views

How can I eliminate artificial oscillation created by numerical solution (NDSolve)?

I need to solve a system of three coupled PDEs. I used this code but it seems that the solution for the third function (B2(x,t)) results in small fluctuations at the beginning of the numerical ...
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1answer
90 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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0answers
33 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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0answers
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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1answer
33 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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51 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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0answers
54 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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1answer
50 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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2answers
291 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 ...
2
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2answers
44 views

System of Differential Equations discrepancy

Using the following code in Mathematica: ...
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0answers
39 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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2answers
74 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{...
3
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1answer
50 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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0answers
34 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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0answers
39 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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1answer
555 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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0answers
79 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 ...
3
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1answer
65 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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0answers
29 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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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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3answers
242 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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0answers
518 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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1answer
147 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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1answer
53 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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0answers
96 views

How useful is $SynchronousEvaluation?

Example SessionSubmit @ Print @ $SynchronousEvaluation Will print False even though ref/SessionSubmit/Details last point: ...
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0answers
75 views

Passing custom options to WolframScript file

I have an example of WolframScript file file.wls with the following contents. ...
2
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0answers
453 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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1answer
80 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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0answers
57 views

Dealing with over eager shadowing messages

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0answers
100 views

Current $Context of a given notebook

nb = CreateDocument[{Dynamic@$Context}, CellContext -> Notebook] It will show Notebook$$22$93500` or something similar. How ...
8
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1answer
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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0answers
89 views

Mathematica can't solve system of equations

I'm trying to solve an admittedly gnarly system of equations: ...
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1answer
63 views

Total derivative after numerical solution of a system

I have a system of three equations in three unknowns, $k$, $\theta$ and $w$. I am interested in the behavior of the variables when one parameter changes. I first specify the system: ...
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0answers
34 views

How to create a new notebook without the value defined in a former notebook? [duplicate]

When I try to calculate sth new and create a new notebook, the variables in the former notebook will be a trouble. The only I know is use Clear["*"] or quit the ...
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0answers
1k views

Difference between NSolve and FindRoot?

While it is clear what FindRoot does (start at a point and look for local extremum using gradient), how does NSolve work? Also, ...
0
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1answer
131 views

Is it possible to find the equation of motion of a spring-mass system using differential equations as input?

I am searching for a solution the check the validity of my calculations on standard dynamics problems. Basic mechanical engineering environment, systems containing movable masses connected to each ...
5
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4answers
170 views

Defining system of Equations

I am not able to define a system of n equations having n variables x1, ...
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1answer
45 views

Make a term appear in my solution

There is a solution for a linear system: ...
1
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0answers
55 views

Is there a way to capture crash data on Windows?

I have a very large notebook which I've been working on for years. Every day, after I add to it, I save it as PDF. Recently Mathematica has crashed when I try to save it as PDF. Mathematica just ...
10
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1answer
984 views

What makes a function ticklish?

The Advanced Dynamic Functionality tutorial informally describes a ticklish function as follows: Every time you evaluate RandomReal[], you get a different answer,...
11
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2answers
440 views

Catching MachineUnderflow in Version 11.3

Ilian's answer to question 72229, involves SetSystemOptions["CatchMachineUnderflow" -> False] Evidently, this worked in earlier versions of Mathematica, but ...
8
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1answer
128 views

Exclude inactived functions from DifferentiationOptions

The list of functions provided in SystemOptions["DifferentiationOptions" -> "ExcludedFunctions"] show which symbols will not be touched by ...
11
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1answer
100 views

Precedence of cell group tokens over package's expressions

Bug introduced in V10.4 or earlier and persisting through V11.3 [CASE:4072996] ...
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0answers
40 views

NotebookEvaluate within cell with CellContext->Notebook

I've encountered the following issue with NotebookEvaluate (note the grouping into 3 distinct cells): ...
0
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1answer
238 views

How to permanently modify the $Path in Mathematica [duplicate]

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

Tracking intermediate values within Manipulate

I want to determine the intermediate values of P[i][t] = {X[i][t], Y[i][t]} for the following system of nonlinear differential equations: ...
1
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1answer
354 views

Solving a System of Nonlinear Differential Equations

I tried to solve the following system of equations: \begin{align*} x'(t) &= \frac{a \, |y(t)-x(t)|}{e^{\, b \, |y(t)-x(t)|}} - \frac{c}{|y(t)-x(t)|}\\ y'(t) &= - \, x'(t) \end{align*} with ...