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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38 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
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1answer
48 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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35 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)...
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28 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 ...
4
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3answers
229 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
232 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
104 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
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1answer
49 views

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

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

How useful is $SynchronousEvaluation?

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

Passing custom options to WolframScript file

I have an example of WolframScript file file.wls with the following contents. ...
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0answers
280 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
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1answer
64 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
47 views

Dealing with over eager shadowing messages

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0answers
90 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
686 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
81 views

Mathematica can't solve system of equations

I'm trying to solve an admittedly gnarly system of equations: ...
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1answer
59 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
26 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
349 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, ...
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1answer
100 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
127 views

Defining system of Equations

I am not able to define a system of n equations having n variables x1, ...
1
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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
53 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
970 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,...
9
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1answer
268 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
118 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
97 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
34 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
147 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
44 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
159 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 ...
4
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1answer
237 views

Better definitions of Reap and Sow

I am having tremendous difficulty understanding Reap and Sow in Mathematica. The definitions are pretty circular. When I look at the definition of Sow, I get, "specifies that e should be collected by ...
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4answers
95 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
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1answer
181 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 ...
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0answers
135 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? ...
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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 ...
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0answers
313 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 $z$ ...
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0answers
70 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
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1answer
268 views

Transformations of equations into a matrix form

I have a system of 4 equations which is the following : ...
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0answers
112 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 ...
11
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0answers
197 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 ...
35
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2answers
6k views

Mathematica stuck in “running” for every calculation I attempt, kernel error

Bug introduced in 11.1.1 and fixed in 11.1.1 Bug was caused by a paclet update and fixed by a paclet update. I downloaded Mathematica this morning to do an implicit polar plot. I attempt to run the ...
3
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0answers
114 views

Is the Wolfram Server disabling Desktop Mathematica? [closed]

Earlier I got this in response to 2+2 I had to terminate it with task manager. Right now I'm trying to access FinancialData. In response to FinancialData["CAT"], the kernel has been running for 15 ...
4
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0answers
201 views

Adding an attribute crashes the system?

At some point I noticed the following errors just in the documentation: And not only this one, this is not only for Manipulate, there were many others. Also the ...
5
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1answer
121 views

Unique[] and special handling of symbols ending with a single dollar sign

Example Unique[x] generates a new symbol, with a name of the form x$nnn. If so then this is not correct: ...
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0answers
59 views

Where to put my packages [duplicate]

I wrote a few packages with various functions. Now I would like to put these packages to a location that I can "Get" them via <<name ( I prefer a directory "...
2
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0answers
141 views

“Mathematica running” not shown in Mathematica Icon in 11.1

I wonder whether this is a singular problem to my environment or not: In Mathematica 11.0.x the icon of Mathematica showed a circle around the Mathematica symbol when Mathematica was running, so one ...
8
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1answer
184 views

Complete list of FrontEndResources

tl;dr I'm interested in finding a complete list of the strings that can be passed to FrontEndResource (I only need the first string, in the cases where two strings ...
4
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0answers
103 views

Determining what symbols are defined in a DumpSave / .mx file [duplicate]

Against my better judgement, and in the interest of speedy I/O, I've decided to use .mx files for a project - limitations and all. I'm dealing with a few gigabyte-...