Questions tagged [warning-messages]
The warning-messages tag has no usage guidance.
1,423
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Help implementing Lagrange inversion
I'm attempting to find the coefficients of generating functions using Lagrange inversion. I am finding the series coefficients with:
...
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Error in Installing Mathematica on Ubuntu 22.04 LTS [closed]
I have a student subscription from my university for Mathematica, and I recently switched from Windows to Ubuntu 22.04 LTS. I found the .sh installation file for the Linux kernel for Mathematica on ...
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1
answer
60
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Animate function error
I'm new to Mathematica and I'm trying to plot a interactive graph of a curve with a slider that shows the tangent to the curve in whichever point of the interval, my implementation is
...
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1
vote
1
answer
142
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Newton Raphson 0th order with gauss elimination error
I'm trying to do a Newthon Raphson with 1st order continuation to solve a problem with 4 variables (fix 2 and obtain the results of 2 (x and Chi).
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2
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81
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FermionSpinSum: encountered a fatal problem and must abort the computation
While running my teacher example using Feyncalc and FeynArts 3.10, I encounter this warning from Mathematica
...
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2
votes
2
answers
148
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Newton Raphson with continuation error
I have here an algorithm to solve multivariable nonlinear systems using the Newton-Raphson method with continuation. However, there is some error in the code that I am unable to identify, causing it ...
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1
answer
142
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Gauss elimination with pivoting error
I am attempting to write code for Gaussian elimination with pivoting. I need my code to be able to find the maximum pivot in the column and swap the rows to ensure that the first element is always the ...
2
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1
answer
89
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Mathematica thinks that an initial condition is a boundary condition
I would like to solve the following reaction-diffusion problem in Mathematica using NDSolve:
...
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1
answer
367
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1
vote
1
answer
153
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PlotLegends` and VectorAnalysis is now obsolete on Mathematica v 12.0.0.0 Home edition [closed]
My code was working a few months ago. Now I receive the messages:
...
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1
answer
89
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Difficulties in solving a system of differential equations with a matrix differential equation
I'm trying to solve a system of differential equations that looks like this:
...
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3
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253
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Plotting Incidence function of the SIR Model
I am working on the SIR model and I am trying to plot the incidence function on a specific time interval.
...
7
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1
answer
152
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How to automatically install FFmpeg without an error
When I try to export a list of images as an AVI file, I get this message:
When I select "Install FFmpeg", this message then pops up
The community post is hard to follow, and the images ...
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40
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Finding parameter range of inequation with no solution
Let the solution set of the following inequation
$$6 k - 2 x + k x^2 < 0, \quad k \neq 0$$
be an empty set. How can I find find the range of parameter $k$?
The following code gives an answer:
...
- 2,879
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87
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Replacing warning message with custom text
I am using the following code to determine the maximum of a function:
f[x_] = Log[3/10, 3 - 2 x - x^2]
xr = FunctionDomain[f[x], x]
Maximize[{f[x], xr}, x]
As the ...
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4
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6
answers
321
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How can I fit a set of points to the form $y = a(b-x)^c$?
I have a list of points $(x, y)$, and I expect them to be related as $$y = a(b-x)^c,$$ where $a$, $b$, and $c$ are unknown constants. I also know the approximate values of constants, which can be used ...
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PolynomialGCD::lrgexp when integrating
I want to calculate the exponential in the last line of the following code, but the code never completes and just produces errors about PolynomialGCD.
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167
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Newly installed Mathematica Message[$ConfiguredKernels::obso] is Protected error?
I installed Mathematica 13.3(My $Version result is "13.3.0 for Microsoft Windows (64-bit) (April 11, 2023)" and I use ...
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Accuracy or precision issues with this code
I'm experiencing issues with the code below (this working code solves the Tolman-Oppenheimer-Volkoff (TOV) equations in general relativity, for the hydrostatic equilibrium of a spherical star). ...
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Startup error messages GridCreationSettings
I've looked for a solution, but couldn't find one. I've reinstalled,but still get the following two (related) messages on startup:
The specified setting for the option GridCreationSettings, Columns ...
2
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1
answer
136
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How to remove an apparent singularity in NDSolve?
I'm trying to numerically solve two coupled differential equations using NDSolve. The following code works, except that I had to remove a starting point singularity at $r = 0$ by adding an arbitrary ...
- 3,959
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1
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106
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Finding the maximum of a non-linear function symbolically
I have the function $$f(x,\alpha) = x^\alpha - \frac{x^2}{2}$$ where $x>0$ is the main variable of interest and $\alpha \in (0,1)$ is the parameter of curvature:
...
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2
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129
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How to fix these warnings from an NDSolve code?
The following code works but it give several warnings that makes me feel nervous about the reliability and accuracy of the output:
NDSolve: Warning: estimated initial error on the specified spatial ...
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1
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Why is StoppingTest in red? What other option to stop NDSolve?
The following stripped down code works, but I'm experiencing some strange warnings: from an old document made with Mathematica 7.0 (but used in version 13.2), I'm getting several warning messages ...
- 3,959
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40
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Trying to use ProbabilityDistribution for custom distribution - Getting errors/warnings I don't understand
I have this custom distribution that I want to use in Mathematica, but there
appears to be some sort of problem I don't understand.
Also, when I compute the mean for the custom distribution via
...
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1
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124
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Why is there an error about division by 0?
I'm converting all of my old Mathematica 7.0 codes to my new Mathematica 13.2, and I'm struggling with some issues I didn't encounter with version 7.0. The following code is giving me a headache, ...
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NDSolve "Coupled differential equation"
I am trying to solve the given coupled differential equation using NDsolve.
$$
\begin{array}{c}
n''(r)+\frac{n'(r) T'(r)}{T(r)}+\frac{n'(r)}{r}+\frac{n(r) T''(r)}{T(...
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73
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Luminical distance numerical integration and plotting
Considering the following dynamical system and initial conditions:
...
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answer
73
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numerical integration - Numerical integration converging too slowly
I am trying to run the following code
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81
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LMDB Library cannot be loaded by `LibraryLoad`, how to compile properly
I cloned LMDB* from https://github.com/LMDB/lmdb and compiled on a Mac M1 with
make -e clean liblmdb.so CC="cc -target aarch64-macos-none"
which produced ...
- 3,897
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0
answers
84
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Repeated convergence test failure reason in this particular problem
I have the following Mathematica Code to solve a coupled system of ODEs, which in principle is correct and its context is not a priori important:
...
4
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1
answer
106
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How to evaluate expression completely?
In MMA 13.2, if we run
Quantity[1, 1/"DegreesCelsius"]
it automatically throw a message
But if we run
...
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88
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Solving a Variable Number of Difference Equations with RSolve
I'm trying to solve a variable number of linear equations defined by
$$
\begin{align} x_0 &= A+Bx_1 \\ x_i &= C+\frac{B}{2}(x_{i-1}+x_{i+1}), \hspace{.25cm} 1\leq i \leq n-1 \\ x_n &= C+...
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NMaximize error: The function is value....is not a number
I cannot manage to solve this problem:
$$max_{p1,p2} \hspace{0.1cm} (p1 - w1) * \frac{\exp(beta*x1 - alpha*p1)}{1 + \exp(beta*x1 - alpha*p1) + exp(beta*x2 - alpha*p2)}$$
$$ + (p2 - w2) * \frac{exp(...
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Is it possible that an attempt to `Save` damages a file to the extent that further work on it becomes impossible?
I have a history of my Mathematica 13.1 having problems sometimes when I try to Save or DumpSave variables with long formulas -- ...
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VectorPlot "Part 1 of {} does not exist" error
Bug introduced in 7.0, persisting through 13.2.
I am looking to plot the Magnetic Vector potential, A, as a function of position along the edge of a density plot. The density plot is fine, and I ...
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40
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IntegerDigits[] gave an error despite working properly [closed]
I was running the following code,
...
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1
answer
102
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Fitting data to a nonlinear model and avoiding warning
I have a complicated model and I want to fit it to my data.
I used NonlinearModelFit. The fit quality is very poor (P is infinitesimal) and it comes with a warning ...
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1
answer
68
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3D plot not working, find max/min points [closed]
Im trying to plot this graph in mathematica:
(x+y)sin(x-y)
And this is my in- and output:
Plot3D[(x + y) (Sin[x - y]), {x, -50, 50}, {y, -50, 50}]
The output is ...
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How do we optimize the lowest eigenvalue of a symmetric matrix using NMinimize?
I am trying to diagonalize the symmetric matrix while optimizing
the lowest eigenvalue subject to constraints.
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Fixing the following error message for the simple substitution $ j[bb, a1, a2] //. {j[bb, ll__] -> List[ll].List[b1, b2]} $
For a given Mathematica code
j[bb, a1, a2] //. {j[bb, ll__] -> List[ll].List[b1, b2]}
I obtain the desired answer which is
...
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4
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4
answers
135
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Change format of vector for input argument of function
I have a function f defined as
list = {a1, a2, a3, a4, a5, a6};
expression = a1 + a2^2 + a3^2 + a4 + a5*a6;
f = Function @@ {list, expression};
The input in vector ...
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1
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79
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3
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1
answer
101
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Ask Mathematica to always print errors in InputForm
When using Mathematica on the terminal (as REPL or as script) the errors are formatted in this way:
...
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1
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160
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RuleDelayed (:>) involving Piecewise leads to Piecewise::pairs warning in ReplaceAll (/.)
When I write a replacement rule like this:
Piecewise[{{x^2, x < 0}}] /. Piecewise[a_, b___] :> Piecewise[a, b]
It works fine, but I get the unexpected ...
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166
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NDSolve unable to find initial conditions that satisfy the residual function within specified tolerances
I'm trying to solve a set of differential-algebraic equations with boundary conditions:
$A\frac{d^2\psi}{dx^2}=[c_{F}-2c_{D}(x)+c_{C}(x)]F$
$c_{D}(x)=0.1\exp(-0.2253 - 76.5596\psi(x) - 1.1149)$
$c_{C}(...
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1
answer
117
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Error when using FindRoot
Currently I have an equation with boundary conditions as such, $A \frac{d^2\psi}{dx^2}= C_{F}F, \psi(\frac{1}{2})=0,\psi\:'(0)=0$ and I have to use a "shooting method" to find the Dirichlet ...
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You're running in a mode which does not allow saving files
Does anyone know how to solve this problem?
(13.0.1 for Microsoft Windows (64-bit) (January 28, 2022))
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