Questions tagged [warning-messages]
The warning-messages tag has no usage guidance.
1,315
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How to make warning and errors messages on console print in RED? so easy to see them?
When I run large computation with 1,000's of iterations, then later look at the console looking for any errors or warnings generated, it is hard to locate them scrolling up and down, as the color of ...
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1
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Warning: Inconsistent or redundant transcendental equation
When I try to solve (for complex c[i,j])
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- 3,553
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Wolfram script exported from a Mathematica Notebook : errors actually warnings?
I have exported with the following script put at the beginning of my Mathematica notebook :
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- 35
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NIntegrate can't integrate function but work fine with the expression [closed]
I have a function called psi0 that looks like this: psi0 := E^(-(x - 10)^2/10) and I'm trying to integrate it numerically from 0 to a variable L. However, I keep ...
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Divide by zero warning: Actual division by zero or spurious?
I have the following code that calculates the gain of an amplifier
...
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Warning message in current window in v12
I don't remember exactly when, but warning messages started to show up in a new window.
I found a post about this
Warnings shows up in message window
The poster gives us solution - change an option in ...
- 2,451
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Convex optimization of a least squares regularized objective function [closed]
Given, a vector of observations $\mathbf{y}=(y_1, y_2,\ldots,y_n)$ I am trying to find the soltuion to the following optimization problem:
$$
\min{ (1/2) \|\mathbf{y-x}\|_2^2 + \lambda \|\mathbf{Dx}\|...
- 493
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2
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Evading the fewer dependent variables than equations error
I'm writing a code that tries to solve differential equations generated from some existing code. The equations so generated are often seemingly overdetermined but actually solvable: e.g.
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Possible Bug: Why does ListLinePlot3D not work with Dynamic here? [duplicate]
Why are the errors below thrown? They are very strange and seem to be incorrect.
Error 1
ListLinePlot3D[Map[Dynamic, {{1, 2}, {1, 3}}, {2}]]
Error 2
...
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74
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1
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1
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Interpolation Function is not saved in notebook
I get the following message when an interpolation function is generated as a solution of NDSolve:
I don't know why this warning is showing and I don't find anywhere where I can consult what this ...
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0
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What's the best method to use when NIntegrating a sinx + cosx type function?
I'm having some problems when trying to NIntegrate a sinx + cosx type function. I have already tryed several combinations of ...
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Derivatives with respect to vector components
I am trying to work with functions of arrays, I tried the following:
f[x_] := x[[1]]^2 + x[[2]]^2 + x[[3]]
D[f[x], x[[1]]]
and got
...
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I need some help debugging a calculation command
I am trying to make a calculation but I have a few bugs and I do not understand them/how to fix them. Below is my syntax, the output, and the error messages. I am trying to calculate the point in my ...
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1
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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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Problem with my function ($IterationLimit::itlim: Iteration limit of 4096 exceeded.)
I defined a function that only depends on one coordinate and it is giving an error. My code for now looks like this:
...
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Docker on Mathematica, Windows OS
I've been trying to learn how to run some docker-dependent scripts in Mathematica.
Every time I try to run the script, I get the same error:
...
- 225
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What do those messages in NDSolve mean?
I am trying to solve the problem $$u_t=u_{xx}-Au, \ \ \ \ A>0, \ \ 0<x< \pi$$
$$u_x(0,t)=u_x(\pi ,t)=0, \ \ \ t\geq 0 $$
$$u(x,0)=\cos x -3 \cos (2x)+5 \cos(4x), \ \ \ \ 0 \leq x \leq \pi$$...
user84483
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The element mesh has insufficient quality
I am quite new at FEM. I was trying to create a triangular mesh of a rectangular region. I wanted to do something very basic: Discretize the domain using squares and then subdivide each square into ...
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Singularity in NIntegrate
I am trying to do integration with NIntegrate command. I know that the function I am integrating (the integrand) has a singularity at x=0. I am trying to exclude this point from the integration, but ...
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LogitModelFit to predict a categorical variable
I am trying to predict life expectancy based on GDP per capita and literacy rate. Life expectancy is coded as low and high, and the two predictor variables are numerical.
Here is some sample data:
<...
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NDSolve or NDSolveValue for simple, 1D diffusion
Trying to solve a simple semi-infinite diffusion equation numerically.
At t=0, the value at z=0 rises from 0 to cA02, and diffuses in the positive x direction.
<...
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How to get special solution with DSolve?
I am trying to solve the following ODE with DSolve, but can't obtain a special solution (which I know exists simply by looking at the equation: f[x]=1)
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Too few arguments given for UndirectedEdge
I want to sort this UndirectedEdge and got this warning.
The function still works and return correct result though. How can I fix this?
...
- 1,750
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Incompatible dimensions when trying to use an array of functions within Region3D function [closed]
When trying to plot an array of functions within the region3D function, I get the error code
...
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2
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Solving equations involving implicit magnetic field
I am trying to solve these two equations for various values of B(magnetic field):
$$\text{xb}'(l)=\frac{\sqrt{\text{g11}\left(r_0\right) \left(-\text{gtt}\left(r_0\right)\right)}}{\text{g11}(\text{rb}(...
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Exporting Plot with suppressed error messages
I have generated a plot that has some error highlighting that I cannot get rid of. There does not seem to be a good way to do so, but it does not impact the actual plot itself. In order to display it ...
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2
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Error message not reproduced at reevaluation, SetDelayed cache?
Mathematica v13.0:
nr:=HoldForm@Evaluate@Function[t,x@t][]
then evaluate
...
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Intel MKL ERROR: Parameter 2 was incorrect on entry to ZGEHD2
I have some code which is diagonalising very large random matrices, and storing certain statistical properties of their eigenvalues and eigenvectors.
The code runs fine on my computer. When running it ...
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2
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Problem with multidimensional interpolation: "Data point {0,0} contains abscissa 0, which is not a real number"
I'm trying to do a multidimensional interpolation. For simplicity, say I have the following array:
{{{a,b},c},{{d,e},f},{{g,h},i}}
This means that I have a two-...
- 618
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Stiff non-linear ODE with free boundary problem
I use mathematica to solve differential equations and many problems I solve have a free boundary. In trying to solve the equation I provide below, however, I get the following message:
NDSolve::ndsz: ...
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Why is the parametric plot failing?
I tried running the following code but it doesnt seem to be working, it seems to be stuck on running. I think it's got something to do with the way I am defining functions with a variable integration ...
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Possible bug in Integrate: convergent integral reported divergent
$Version
"8.0 for Microsoft Windows (64-bit) (October 7, 2011)"
on Windows 10
Consider the calculation of this integral
...
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Plotting issue when using Manipulate [closed]
Please refer to the below code, not sure why the plotting gives an error (Manipulate::vsform).
The plotting seems to work if I remove the manipulate function.
Can ...
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The scaled boundary value residual error in NDSolveValue
What is the reason behind getting the following error?
...
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Integrate returns "diverging integral" for obviously convergent expression
Integrate[Cos[phi]^2*Sin[phi]^n, {phi, 0, Pi}, Assumptions -> n > 0]
on Mathematica 13.0 returns the obviously mistaken error message (...
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Error solving differential equation
I am new to Mathematica, I am trying to solve a very basic differential equation and getting an error.
Can someone please assist as to why I am receiving a ...
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0
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Numerical integration with poles
I have got many errors for this integral. Anyone knows how to fix it? (I am using mathematica12.2)
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Error when placing legends
Consider the following plot
plot = ListLinePlot[{{{0, 0}, {1, 1}}, {{0, 0}, {1, .8}}}, PlotLegends -> Placed[{"1", "2"}, {.8, .4}]]
When I ...
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DSolve with constant (e.g. $y'(x)=c x$)
I'm trying to solve the following problem:
I already know the answer is $y(x) = x^2$, but how could I ask Mathematica to solve this for me?
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NDSolve error: CoefficientArray:... is not a polynomial
I get strange errors (CoefficientArrays::poly and NDSolveValue::femper) with NDSolveValue: ...
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Errors appear after integration of an interpolating function
I have a little question about integration of an interpolating function.
There is an error in assumptions of the integral.
I have a function that was obtained with an interpolation method:
...
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1
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Numerical integration yields errors [closed]
I try the following simple calculation but Mathematica gives me some errors. I am not sure why I get these error messages and if the calculation is correct after all, I'd appreciate some feedback.
...
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Mathematica and Google Drive backup client
My Mathematica notebooks (as well as all other files I author in my research) are in a directory that is managed by the Google Drive client. This automatically backs up everything I create and I don't ...
- 1,406
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How to prevent unwanted output in NMaximize or NMinimize
I have problems with unwanted outputs of NMaximize. I tried to use the command Quiet[] and Off[] in order to turn off the warnings and unwanted outputs but no avail.
You can see the NMaximize part of ...
- 2,355
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Launching Wolfram Engine from MacOS Monterey Shortcuts app
I am trying to figure out how to launch the Wolfram Engine from the Shortcuts app (new feature app in MacOS Monterey). Usually, I open the terminal go to the directory where I store my notebooks and ...
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Defining variable start position with ParametricNDSolve
I would like to have a variable start point for my initial conditions in ParametricNDSolve. I was hoping ideally this would look like the following (with a random ...
- 697