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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18
votes
2answers
216 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
votes
2answers
43 views

System of Differential Equations discrepancy

Using the following code in Mathematica: ...
2
votes
0answers
35 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 ...
1
vote
2answers
58 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
votes
1answer
35 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 ...
2
votes
0answers
28 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 ...
1
vote
0answers
33 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 ...
2
votes
1answer
166 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. ...
2
votes
0answers
36 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 ...
0
votes
0answers
46 views

Plot3D is not showing the expected plot

I'm trying to Plot3D a complicated function, and was getting an empty plot, nothing. Everything was well written. Then, I went to the definition and copied the ...
3
votes
1answer
62 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 ...
0
votes
0answers
37 views

Solving a system of differential equations which include copula

I am trying to solve the following system of differential equations for survival functions $\frac{d}{dx} S_{crude}^{(1)}(x) = C_1(S_{net}^{(1)}(x), S_{net}^{(2)}(x)) \times \frac{d}{dx} S_{net}^{(1)...
0
votes
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}...
0
votes
0answers
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 ...
4
votes
3answers
233 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)) ...
2
votes
0answers
381 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?
0
votes
1answer
118 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: ...
6
votes
1answer
52 views

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

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

How useful is $SynchronousEvaluation?

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

Passing custom options to WolframScript file

I have an example of WolframScript file file.wls with the following contents. ...
2
votes
0answers
343 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:...
-2
votes
1answer
68 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}]; <...
8
votes
0answers
50 views

Dealing with over eager shadowing messages

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8
votes
0answers
94 views

Current $Context of a given notebook

nb = CreateDocument[{Dynamic@$Context}, CellContext -> Notebook] It will show Notebook$$22$93500` or something similar. How ...
8
votes
1answer
794 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 ...
0
votes
0answers
83 views

Mathematica can't solve system of equations

I'm trying to solve an admittedly gnarly system of equations: ...
0
votes
1answer
60 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: ...
0
votes
0answers
28 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 ...
1
vote
0answers
565 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
votes
1answer
111 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
votes
4answers
139 views

Defining system of Equations

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

Make a term appear in my solution

There is a solution for a linear system: ...
1
vote
0answers
54 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
votes
1answer
974 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
votes
2answers
372 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
votes
1answer
120 views

Exclude inactived functions from DifferentiationOptions

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

Precedence of cell group tokens over package's expressions

Bug introduced in V10.4 or earlier and persisting through V11.3 [CASE:4072996] ...
1
vote
0answers
37 views

NotebookEvaluate within cell with CellContext->Notebook

I've encountered the following issue with NotebookEvaluate (note the grouping into 3 distinct cells): ...
0
votes
1answer
180 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
votes
1answer
45 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
vote
1answer
184 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 ...
1
vote
4answers
124 views

Solving a system of equations for a fraction

I want to solve a system of equations not for one specific variable but for a fraction of two variables. How can I do that? I want to solve: ...
2
votes
1answer
183 views

Different outputs for Simplify

In at least one instance, the same Simplify command (without using options) produces very different results on two of my computers, one Windows 7 and the other ...
0
votes
0answers
161 views

How can I globally change $Path permanently? [duplicate]

I have two packages that I would like to append to $Path. I have looked at this link for help but after I quit Mathematica, I have to repeat the process again. Where can I permanently modify $Path? ...
0
votes
0answers
70 views

code to build systems of equations

I asked the question before but I forgot my login information: here is the question: How many equation systems can I build from five equations? the code works good but miss some equations for ...
0
votes
0answers
366 views

How to plot the phase portrait for $4\times 4$ ODE system?

I wrote below the instructions in Mathematica because I wanted to see the phase portrait of systems of DE of $4\times 4$ dimension. But Mathematica cannot recognize the last 2 variables $y$ and $z$ ...
0
votes
0answers
73 views

solved differential system of equation

I have a system of N differential equation. For solve the system I tried to diagonalize the matrix, for example consider the next system: $$ \begin{pmatrix} \dot{x} \\ \dot{y} \\ \dot{z} \end{pmatrix}...
4
votes
1answer
338 views

Transformations of equations into a matrix form

I have a system of 4 equations which is the following : ...
0
votes
0answers
114 views

Solving system of trigonometric equations

I have a 6x6 matrix full of sin and cos in 7 variables. I should calculate the value of the variables that makes the determinant of the matrix being 0. I have tried with the following syntax but it ...
12
votes
0answers
243 views

How can I disable system updates only?

Suppose I'm quite happy with my current Mathematica installation and wish to keep the system in its current form just reliably working. Since there were already at least two cases[1,2] when a lot of ...