Questions tagged [warning-messages]

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Error message using DSolve “Equation or list of equations expected instead of 0 in the first argument” [closed]

I get the error using DSolve "Equation or list of equations expected instead of 0 in the first argument" running the following script. Any help would be much appreciated. This is a Timoshenko beam ...
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2answers
716 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,[...
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0answers
35 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
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1answer
81 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} \\ ...
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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})} ...
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0answers
51 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?: ...
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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
36 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 ...
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0answers
31 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 ...
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1answer
54 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 ...
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1answer
40 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: ...
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0answers
45 views

“Operation Not Permitted” and Problem with Setting a Directory [closed]

I use SetDirectory[] with a valid path as input that I have used many times before. The output is Operation not permitted. ...
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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,...
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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 ...
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0answers
15 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 ...
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0answers
70 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 ...
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1answer
127 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 ...
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0answers
34 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 ...
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2answers
72 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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35 views
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0answers
59 views
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0answers
31 views

NonlinearModelFit error: nrlnum [closed]

I use NonlinearModelFit: ...
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3answers
159 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: ...
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2answers
58 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 ...
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2answers
42 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
52 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/...
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0answers
31 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: ...
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2answers
299 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 ...
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0answers
85 views

There seem to be severe issues with Mathematica 12.1 running System Modeler models and with WSM 12.1 itself on Windows 10

I am using Wolfram Mathematica 12.1 and the Wolfram System Modeler 12.1 on a Windows 10 (64 Bit) notebook. Pretty much exactly since yesterday (2020-04-10), I am experiencing severe and previously ...
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2answers
60 views

Problem with finding this integral [closed]

l am trying to find this integral by Mathmatica, but there is some problem that Mathmatica does not give any answer, there is method to solve this integration ...
5
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2answers
230 views

How to Calculate Factorial when Overflow/Underflow occurs

I'm trying to compute this function, which sums to 1 for $0 < \alpha < 1$ and $k \rightarrow \infty$ ...
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0answers
92 views

How to solve these equations without errors?

I'm a new user of Mathematica 12. I have to plot real and imaginary solutions of two equations, eq1 and eq2, which contain the ...
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0answers
32 views

How is following two (same) calculations giving two different results? [closed]

I have the following two pieces of code which give me two different results, ...
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0answers
30 views

How to delete random elements with RandomChoice?

I have a list of prices and a list of dates, but I have 154 more prices than dates. So I want to delete random prices to match both lists, however, every time I run the block of code I get a different ...
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0answers
57 views

Why is the sum of the series calculated using the integral

I tried to calculate the sum the Harmonic series via NSum up to a huge limit and got an error: NIntegrate: Numerical integration converging too slowly; suspect one of the following: singularity, ...
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0answers
93 views

Why does this memoized function cause the kernel to quit? [closed]

The following memoized recursive function causes the kernel to beep and quit. ...
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0answers
21 views

MakeExpression : Input Form error even with perfectly written expressions

I am frustrated by this MakeExpression error which sometimes shows up and sometimes doesn't for perfectly written expressions. How do I tackle this error? What is wrong with my code? ...
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0answers
33 views

Error in CDFDeploy

I'm deploying a Manipulate code to a CDF using CDFDeploy. Everything was going fine until now. All of a sudden, I'm getting the ...
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0answers
37 views

Unknown Box Name (ToBoxes) Error

I'm getting the following error in Mathematica What is going on? How do I avoid such an error? In order to roughly understand how I'm getting this error, here is a bit of context: I'm using ...
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0answers
21 views

FactorSquareFree::lrgexp: Exponent is out of bounds for function FactorSquareFree. Error

I'm trying to make a two-dimensional contour plot of the temperature of a plate. This is my initial function: ...
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1answer
40 views

Finding maximum of a function of 2 variables

I have function defined in such way: ...
7
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4answers
154 views

How to handle Part function error when position does not exist?

Say a list list={{1,2},{3,4}}, list[[1]] and list[[2]] works. But ...
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1answer
27 views

Avoid an Error Message when Importing

Consider the following code Button["Import", file = SystemDialogInput["FileOpen"]; data = Import[file], Method -> "Queued"] which yields a button which, ...
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0answers
40 views

How to avoid expressions of Zeros and how to reinsert results in a Module

Here i have just a short example of my actual problem ...
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2answers
220 views

FEM Mesh related errors

Bug introduced in 12.0. Fixed in 12.1.0. I try to solve the simple heat transfer equation but there are some errors at the stage of the pre-processing. ...
4
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1answer
152 views

DSolve: unable to solve the conditions

I have a second order differential equation with $2$ boundary conditions and want to use the following code to solve it: ...
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0answers
39 views

DensityHistogram only returns a gray box

I have a complex Mathematica workbook that I've been using to read in binary files, create coincidences, perform an energy calibration, and final produce some coincidence analysis. The original ...
7
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1answer
163 views

FEM: how to find 2D flow under external forcing?

I'm trying to sovle a 2D Navier-Stokes equation in a rectangular region with no-flow boundary conditions and an external rotating force $f(x,y)=(-y,x)$. I've got the error message: NDSolveValue::...
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1answer
42 views

NMaximize fails for linear program?

Consider the following code, maximizing the variable diff subject to some constraints. Notice that all constraints are linear (in)equalities -- the integrality constraints are commented out. (...

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