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.
175
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How the function NDSolve works? [closed]
I am trying to numerically solve a system of ordinary differential equations.
...
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1
answer
49
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Error in using the function NDSolve [closed]
I am trying to numerically solve a system of ordinary differential equations.
...
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1
answer
38
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Exported function discovery with LibraryFunction
Many internal calls boil down to invocations like
LibraryFunction["path/to/library", "funcName" , ...]
I'm on a mac, so I can use the ...
- 3,897
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156
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How do you Solve a Simultaneous System of Recursions
Consider the following system of simultaneous recursions:
r[n] == s[n-1]
s[n-2] == r[n-3]
I am tring to solve this system (I have given a vastly simplified ...
0
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0
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47
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Solving matrix system of ODE coupled to a non linear PDE (Reynolds)
I am trying to solve the following problem for $p$ (the pressure) between a piston skirt and a cylinder lining. This depends on the secondary motion of top and bottom of the piston skirt $e_t$ and $...
- 1
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Problems when solving a system of PDEs with NDSolve
I am currently attempting to solve the following exercise question using NDSolve directly (ref.: Davis, M. E. (2013). Numerical methods and modeling for chemical engineers. Courier Corporation.).
...
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7
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126
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Get All Discrete Univariate Distributions with Symbolic Parameters
I am trying to get all Discrete Univariate Distributions with symbolic arguments from any place in Wolfram Language system. For example this guide:
http://reference.wolfram.com/language/guide/...
- 71.9k
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61
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What is the orange color symbol in the new line? [duplicate]
In mathematica v 13.1 ,
If I type + key of my keyboard in a new cell, I see
What is it? Also if I type + twice in a new cell, ...
- 4,047
4
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107
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Notebook magnification - two independent values
It seems there are two independent, equally influential values those control mathematica notebook magnification.
Just like volume bars in a certain media player(program) and volume bar in tray bar(...
- 4,047
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1
answer
82
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Parallel computing doesn't use my own settings
To differentiate the conjugate of a function,
I used such settings.
...
- 51
1
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1
answer
78
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Use output of Solve as input of another instance of Solve. How to deal with list of rules
I am a complete novice with Mathematica. The last line of the code that I report is a system of equations I'd like to solve (and I am sure it admits a unique solution): (I don't know how I can convert ...
5
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64
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Why does Length[Names["System`*"]] give different values on Windows and Linux?
I was just curious about this.
Length[Names["System`*"]]
Gives slightly different value on Linux and Windows 10. I was wondering why that is as I have ...
- 137k
6
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Documentation Search : google-like (pokygon -> polygon)
If you search for "pokygon" in google.com, then google automatically fix error, and searches for "polygon".
Like google.com, if you search for "pokygon" in mathematica (V ...
- 4,047
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0
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56
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Entire process of "hyperlink of paclet" to "location of real file"?
Hyperlink[AAAAA, "paclet:ref/ModularInverse"]
AAAAA
If I click AAAAA, then a tutorial notebook for ModularInverse.nb ...
- 4,047
2
votes
1
answer
160
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How do I know which kernel is handling which .nb file? [closed]
OS : window 10
Mathematica : v12.2
By my mistake, I opened another mathematica kernel, not knowing a kernel was already running.
I created a lot of .nb files and worked on them in another kernel,
...
- 4,047
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21
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Replacing System` definitions in a context whilst still maintaing acces to them [duplicate]
Given the system operator TensorContract I can define a new one, TensorContractLazy with the attribute ...
- 872
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3
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185
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Quit the loop if encounter error message
First define length-component error (personal term) :
This is an error when we want to get n-th component of a list if n is bigger then the length of the list. For example, ...
- 4,047
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78
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Edit UnicodeCharacters.tr-File
I want to install a new package in Mathematica. If I understand the userguide right, I also have to edit the UnicodeCharacters.tr-File by another *.tr-File for example containing
0x2219 [...
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70
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Error message window upon launching Mathematica
Upon launching Mathematica (v. 11.3) I always get the Messages window with "An unknown menu command token (RebuildHelpIndex)...", as shown below.
How do I eliminate that?
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47
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Temporarily prevent/allow exporting to specific folders
Is it possible to temporarily
Q1) prevent exporting to specific folders ?
Q2) allow exporting to only specific folders ?
Whenever mathematica is about to process ...
- 4,047
2
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2
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267
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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 ...
- 247
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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 ...
- 247
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83
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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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0
answers
76
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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:
...
- 21
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457
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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
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113
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Plot a system of differential equations
I would like to plot the solutions to the system of ODEs that is written below:
...
- 101
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0
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96
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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
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3
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272
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1
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151
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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 ...
- 103
3
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0
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106
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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* ...
- 8,980
5
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2
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880
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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 ...
- 2,407
3
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58
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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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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
$k_1 [t, s] = s^3$...
- 83
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1
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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, ...
- 31.2k
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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 ...
- 189
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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 =...
- 407
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0
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108
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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....
- 1,581
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215
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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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0
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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 ...
- 11
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0
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41
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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
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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 ...
- 1,163
2
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0
answers
53
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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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0
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57
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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 ...
- 2,407
3
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126
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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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26
votes
6
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830
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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 ...
- 860
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2
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49
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2
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0
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70
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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 ...
- 2,335
1
vote
2
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148
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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{...
- 1,941
3
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1
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75
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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
...
- 3,497
2
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0
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36
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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 ...
- 3,968