Questions tagged [warning-messages]
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1,089
questions
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15 views
WolframKernelException: Failed to communicate with kernel
I am an absolute beginner of Mathematica!! ..
I have downloaded, installed and activated the wolfram engine (12.1) on Windows. I have installed the WolframClient and kernal location is in kernelLoc = '...
0
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0answers
12 views
Getting MatrixPropertyDistribution::sclrvctr: error from documentation example
I'm new to StackExchange, but I am having a strange error using just downloaded Mathematica 12.1.1.0 (Student version). I'm trying to use the MatrixPropertyDistribution function, but Mathematica gives ...
-1
votes
1answer
24 views
Accessing Elements in a nested list
I have nested list of the form: (which I don't want to flatten :) )
lol = {{"hello", "bye", "bye", "Hello"}}
How do I ...
0
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0answers
34 views
Solve::nsmet error message while trying to find symbolic solution for equation
I would like to solve several equations for x and I'm looking for symbolic solutions.
The later ones might have some rather difficult or no result at all, but I ...
0
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1answer
31 views
0
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1answer
32 views
Invalid comparison in Manipulation with Stepwise function
I want to draw a graph of the function that I specified using Piecewise. Though I can draw a graph, I keep getting errors saying invalid comparison with -xx + yy i attempted. The followings are my ...
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93 views
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47 views
An option must be a rule or a list of rules - error
I want to plot the following code, in 1D.
However, code displayed below is not being plotted; no results or errors are displayed
...
1
vote
1answer
22 views
Error: Root::npoly: not a polynomial in #1 [closed]
I have a $45\times 45$ matrix $H$ and its elements depend on $Ca$. I want to find its eigenvalues (which will also depend on $Ca$). I do this using:
...
1
vote
1answer
31 views
Issue with transferring list with different length to excel
I have two lists with different lengths and would like to transfer them to excel with the titles "Normalx+" and "Normaly+" respectively. I am using the following script, although ...
1
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0answers
42 views
Numerical Definite Integral of Numerical Laplace Transform
I'm having problem taking the numerical definite integral of a numerical Laplace transform that depends on two variables due to NIntegrate:inumr errors:
...
1
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1answer
49 views
Correcting error messages emitted by ListPlot
I have an assignment to use Module and in which I have to implement:
The input of the program are a list of numbers and a list of strings
Check whether every ...
1
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0answers
49 views
2
votes
1answer
75 views
How to implement an “if an error occurs”-condition in Mathematica programming?
In general Mathematica may return a value even if NDSolve has run into error.
A simple example is
...
0
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1answer
47 views
'x' occurs twice in a nested scoping construct, in a way that is likely to be an error
I am defining the following innocent looking function (which defines a linear function passing through two given points):
...
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0answers
29 views
After any execution temporary error comes out ,How to fix error in temporary directory
how can I repair this error that started to come out of nowhere, I have not made any changes in the equipment but mathematica accuses that error
...
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17 views
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32 views
Nintegrate providing results much smaller than what is expected
This is the first time I am posting something here. So, apologies if I make any mistake. I am dealing with a numerical integration in Mathematica-11.0 that has a Bessel function in it. In order to ...
1
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0answers
32 views
NDSolve w/ vector-valued function doesn't work with addition of outside function?
I'm trying to use Mathematica to solve a problem of orbits, specifically solving for the trajectory of a spacecraft moving near the Earth and Moon. I assume that the Earth is fixed at the center of ...
4
votes
1answer
50 views
Nonlinearmodelfit with integral or nintegral as constrain
Until now I have been using the Nonlinearmodelfit without any issues, but I want to add a new constrain (Integral or NIntegral) to my modelfit.
My fitting function is ...
1
vote
1answer
77 views
NIntegrate::slwcon, NIntegrate::eincr and NIntegrate::inumri
I have the following code to evaluate the double integral of which the integrand contains summations.
...
3
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0answers
27 views
Importing notebooks with definitions that cause messages during formatting
According to reference pages, Quiet "does not quiet messages that occur during formatting", which typically is just a nuisance, but it seems to affect ...
1
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1answer
84 views
6
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1answer
76 views
how to obtain all Messages for Mathematica build-in functions?
Help says Messages[symbol] gives all the messages assigned to a particular symbol. These are called message identifiers per help:
Message names always consist of ...
5
votes
2answers
746 views
Bug in Integrate?
In v. 11.1.0.0 Mathematica for Linux
Integrate[Sin[Cosh[t]], {t, 0, Infinity}]
returns
Integrate::idiv: Integral of Sin[Cosh[t]] does not converge on {0,[...
1
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0answers
40 views
Using LinearLayer for NetEncode[{“Characters”}]
So, I'm trying to make a net to translate a phrase. But I'm uncertain of the use of LinearLayer for a NetEncoder for Characters and getting some error in the training process. Here a toy example of ...
1
vote
1answer
84 views
Why does this integral not compute?
I have the following set of equations:
$$
T_{man} (\phi_{max}, p_{max}) := \frac{\phi_{max}}{p_{max}}
$$
$$
\dot\phi_{ac} (T_{trig}, \phi_{max}, p_{max},t) := \begin{cases} 0 & t<T_{trig} \\ ...
1
vote
1answer
37 views
Mathematica reduces domain when simplifying function
This question was initially (wrongfully) posted on Mathematics SE.
I have the following expression:
$$
\sqrt{1 + 10^{\frac{rdb}{10}} + 2^{1 + \frac{rdb}{20}} 5^{\frac{rdb}{20}} \cos(\mathrm{pdiff})}
...
2
votes
0answers
55 views
Error: “Cannot set current directory” if directory name starts with tilde “~”
On MacOS, there seems to be a bug in FileNames[] when a directory starts with a tilde ("~").
Does anyone else see this behavior?:
...
0
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0answers
25 views
Can certain precision goals not be met by NIntegrate?
I am running into a problem with NIntegrate where PrecisionGoal cannot be met. An example is as follows:
...
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0answers
41 views
What does Eigensystem::geinsl1 mean (a solution for the generalized eigenproblem may be incorrect)?
I'm trying to solve a generalized eigenvalue problem and ran across a warning
Eigensystem::geinsl1: Warning: a solution for the generalized eigenproblem may be incorrect.
Here's a minimal working ...
0
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0answers
34 views
Correct structure in Runge-Kutta method for NDSolve
I'm kind of new in this software and in some cases I just don't know what is going wrong with my code. One of some cases is the first error that the line 22 for the Plot gives me (in the picture). I ...
0
votes
1answer
57 views
Simple pendulum animation using Lagrangian, problems with Graphics[]
I am trying to create some animations of classical mechanical systems in mathematica by using Lagrangians. I wanted to start off by doing the simple pendulum that is visually just a line, then adding ...
0
votes
1answer
44 views
Solve Unable to Solve with Inexact Coefficients [closed]
I am trying to find fixed points for a set of 3 differential equations by setting the first derivatives to zero. I plug these equations into Mathematica's Solve[] function like this:
...
1
vote
0answers
38 views
Why does Plot[D[x,x],{x,1,10}] throw error? [duplicate]
I am experiencing unexpected behavior from Plot and D, and I would like to understand why. If I try this:
Plot[D[x,x],{x,1,10}]...
0
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0answers
20 views
RegionPlot[ParametricRegion[···]] failing to generate output with simple rescaling of axes: ParametricRegion[···] cannot be automatically discretized
I'm trying to plot the image of a subset $U\subset \mathbb R^n$ under a map $F\colon \mathbb R^n\to \mathbb R^2$.
Here is a piece of code which does the job in a simple case where $F$ is the identity ...
1
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0answers
28 views
Graphic and value output error on jupyter notebook connected with wolfram engine
I've been trying to run the Wolfram engine in the Jupyter. I've followed this :
https://github.com/WolframResearch/WolframLanguageForJupyter
But I have some problems.
Why isn't the graphic output ...
0
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0answers
73 views
Getting kernel crashes at startup and with any attempt at evaluation
I just installed Mathematica. Everything worked fine and I am able to open a notebook, but when I try to calculate simple things (e.g., calculating the sum of 2 + 2) it says "running" for a few ...
0
votes
1answer
138 views
FindRoot::lstol error
I'm getting the message:
FindRoot::lstol: The line search decreased the step size to within tolerance specified by AccuracyGoal and PrecisionGoal but was unable to find a sufficient decrease in the ...
0
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0answers
38 views
Why do I keep getting these error messages?
I am trying to fit a parametric differential equation system to the data of the infection cases in Hungary. I keep getting the error messages:
ParametricNDSolveValue::ndcf: Repeated convergence ...
2
votes
2answers
75 views
Why is FindRoot throwing a “singular Jacobian” error when function has small values?
Running the code:
FindRoot[PolyLog[2, -E^-(10 + Sqrt[1 + x^2])] == 10^-30, {x, 10}]
Gives me the error:
...
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0answers
42 views
2
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0answers
62 views
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0answers
37 views
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5answers
253 views
Overflow with NDSolve
Backslide introduced in 10.0, persisting through 12.1.
I am trying to solve the following differential equation and plot the result:
...
0
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2answers
60 views
What does this error mean?
I am trying to solve a system of two Euler equations with a constraint. I do not know the initial conditions and I thought to use ParametricNDSolve to solve the ...
2
votes
2answers
53 views
Evaluation Control for interpolating functions
I would like to find the root of the third component of an interpolating function, here e.g. a BezierFunction p:
...
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0answers
53 views
NDSolve error for system of two non-linear equations
I'm trying to solve this system of non-linear ODE's
$$\left\{y'(s) \left(x''(s) y'(s)-x'(s) y''(s)\right)=0,\mu x'(s) \left(x'(s) y''(s)-x''(s) y'(s)\right)=g \lambda \left(x'(s)^2+y'(s)^2\right)^{3/...
1
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0answers
32 views
Unexpected warnings issued by ListPointPlot3D when trying to make a plotting with labels (a potential bug)
I was making a very simple plotting with code below:
...
asked Apr 11 at 12:17
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2
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2answers
304 views
Why does 'Transpose[list]' work but 'Map[Transpose[#]&, list]' not when attempting to transpose a 2D-array list? [closed]
I define this list:
list={{100,100},{200,200}}
Taking the transpose like this works as intended:
Transpose[list]
Taking ...
