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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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0answers
32 views

How to solve a system of two equations and two variables in function of others terms

I want to Find C1 and C2 in terms of a and e from the following system of equations: ...
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0answers
63 views

Mathematica can't solve system of equations

I'm trying to solve an admittedly gnarly system of equations: ...
0
votes
1answer
46 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
22 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
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0answers
65 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
75 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
118 views

Defining system of Equations

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

Make a term appear in my solution

There is a solution for a linear system: ...
1
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0answers
47 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 ...
9
votes
1answer
955 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,...
7
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1answer
120 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
115 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
94 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
27 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
92 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
42 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
98 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
votes
1answer
138 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 ...
1
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4answers
64 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
89 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
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0answers
93 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
66 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
210 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
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0answers
68 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
150 views

Transformations of equations into a matrix form

I have a system of 4 equations which is the following : ...
0
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0answers
93 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
127 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 ...
34
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2answers
4k 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
110 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 ...
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0answers
198 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
108 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
51 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 "...
1
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0answers
123 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 ...
7
votes
1answer
155 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 ...
3
votes
0answers
77 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-...
10
votes
1answer
2k views

How to pause a running evaluation (and continue it later)

Is it possible to pause an already running evaluation that takes a lot of time? And then continue it later? I can suspend my computer, but that's not what I want. I would like to use my computer in ...
10
votes
1answer
176 views

NotebookEvaluate breaks notebook's context

Bug introduced in 10.4.1 or earlier and persists through 11.3 A support case with the identification [CASE:3813108] was created [...] I have forwarded an incident report to our developers with ...
15
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2answers
588 views

Detecting kernel initialization

Certain operations do not work during kernel initialization. Code from Kernel/init.m, the Autoload directory, or packages set ...
2
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1answer
272 views

Plotting Particular Solutions of a System of Polar ODEs

I'm new to Mathematica, and I'm writing a math research paper and I need to generate a phase portrait of the following system of polar equations $\qquad \dot r=r(r-1)(r-2)$ $\qquad \dot \theta=1$ ...
7
votes
0answers
310 views

How do I determine the Mathematica version without starting the Kernel?

For the Mathematica IntelliJ Plugin, I need to validate if a chosen directory is indeed a Mathematica installation and want to extract its version. The structure of the Mathematica installation is not ...
2
votes
2answers
125 views

Why is the execution time getting smaller and smaller every time?

Why is the execution time to compute the value of sum getting smaller and smaller every time in the following code? And how to get consistency? Thank you very much for your help. ...
6
votes
2answers
542 views

MD5 Checksums For Different Versions Of Mathematica

I have found older versions of mathematica both online and in stores like ebay but it has always concerned me if the version was real. Could we create a list of md5 checksums or sum equivalent for X....
13
votes
8answers
2k views

Does Mathematica 11 work on MacOS Sierra?

I'm not sure if I should upgrade, so I wanted to see if anyone has used v11 sucessfully on the newest OSX? This is the discussion about the same topic on Wolfram Community.
6
votes
1answer
85 views

How to work with BoxOptions (ButtonBoxOptions, PanelBoxOptions, etc.)

The main question is in the title. Here are subtopics I'd like to focus on: Is there a tutorial related to them anywhere in documentation? How can I check what are current values of e.g. ...
32
votes
1answer
580 views

Paclets updating awareness and tracking

It turns out that some silent updating may be done in our computers with paclets. See for example here. How are we aware that something has been changed ? Can we track updating/versions of paclets ? ...
18
votes
4answers
809 views

Is it important that the front-end has a built-in parser?

The Notebook interface has a parser that seems aware of all operator-precedences, allowing us to step through the expressions (rather: Box-) hierarchy with Ctrl+. This is extremely convenient, saving ...
9
votes
2answers
149 views

Problem with LocalSymbol

Bug introduced in 10.2 and fixed in 11.1 I have found that LocalSymbol will sometimes create and store persistent data in a directory different from and off the ...
26
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3answers
4k 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 ...
7
votes
3answers
387 views

Hidden Notebooks?

In Mathematica, almost everything is notebook: your "Untitled-1.nb" is a notebook, Help documentation are a series of notebooks, even those windows helping you to draw things or format your notebooks ...
41
votes
2answers
2k 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 ...