Questions tagged [warning-messages]

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44 views

Solving vector equations with two unknown vectors [closed]

I have the following two equations, where $s, t, a, b,$ and $n$ are vectors; and, we know what $n$ is: $$|| sa - tb || = 1,$$ $$n.(sa - tb) = 0 .$$ Here is my Mathematica code: ...
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1answer
50 views

Creating a ListPlot From Imported Excel file with errors

I'm learning mathematica, and right now trying to plot a graph with error bars. What I would like to do is to import 3 lists with x values(1/viscosity), y values(permeance), and error values, and plot ...
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3answers
61 views

How to solve this error message?"is too small to represent as a normalized machine number; precision \ may be lost."

How to solve this error message? I don't know how to set precision. if I in this case would not have this error k10 = {}; Do[If[Positive[Det[Table[(-0.15 + x1.49910^(-6))^(i + j), {i, 1, 9}, {j, 1, 9}]...
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1answer
116 views

Is there a way to customize how many of the same warning messages are printed?

I have an evaluation inside a Paralleltable which sometimes gives me warning messages. After a certain amount of warning messages it will say: ...
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1answer
80 views

ReImPlot does not plot Imaginary part in Wolfram Cloud

Recently came across a problem: when trying to plot complex-valued function with ReImPlot in WolframCloud (free version), i get only a real part. Is this a free-version issue or something else?
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2answers
107 views

Invalid comparison in Manipulate 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 Min::nord/<...
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1answer
543 views

How to add error bars to a stacked bar chart?

Sorry, I know how to make error bars on normal bar charts, but how can I add vertical error bars to the top of my stacked bar charts, please? ...
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1answer
133 views

There are some warnings thrown with NDSolve here. How can I change my code to avoid them?

I want to solve some differential equations, but the warnings "NDSolve change the value" are thrown. How do I change the equations? Are there some equations that are not allowed? Are some ...
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2answers
296 views

Error Message NIntegrate: "The integrand ... has evaluated to non-numerical values..."

When running the following code, I get the error message that "NIntegrate::inumr: The integrand ... has evaluated to non-numerical values for all sampling points in the region with boundaries {{0,0....
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3answers
5k views

Error "Power::infy: Infinite expression 1/0 encountered". Why do I get this?

Bug introduced in 11.0 or earlier and fixed in 12.3.1 or earlier I need to write this function piecewise and to make a graph for it, x[-3,3]: ...
10
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1answer
260 views

"instruction 9223372036854775807" Bug and Bug with Using DeleteCases[] inside Compile[]

I get an error referring to "instruction 9223372036854775807" as follows. I run the code ...
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0answers
19 views

Messages no longer appearing beneath code [duplicate]

At some point after I updated to 12.3.1 I started noticing that messages stopped appearing beneath the code. So for example, I used to be able to do 1/0 and I'd see ...
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1answer
28 views

Suppress "integral does not converge" error message

Is there a way to suppress this error message and beep?
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1answer
97 views

Compile Can Handle Passing an Empty List Only When Returned by Some Functions?

There seems to be a bug whereby Compile can deal with empty lists only when passed in some cases. Consider the case below. ...
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0answers
65 views

NIntegrate and MaxRecursion

I'm using NIntegrate to get the value of a very complicated function f[k,T,M], where T and <...
2
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1answer
191 views

(Numerical) calculation of nested integrals

The problem I'd like to (numerically) compute nested integrals of the type $$I(a;k) \equiv \left( \prod_{i=1}^k \int_0^\infty \mathrm{d}x_i \right) \exp \left( - \frac{1}{4a} \sum_{i=1}^k \left( x_i - ...
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0answers
81 views

Part specification is longer than the depth of object

I want to solve the function lns50 all the values are Part 1 of an List ...
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1answer
82 views

Non-numerical values for integral

I am trying to solve the following integral numerically ...
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0answers
40 views

JordanDecomposition not evaluating

When there are very small differences between entries in a diagonal matrix, sometimes JordanDecomposition does not evaluate and gives an error message: ...
1
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1answer
84 views

how can i solve a system with inexact coefficients

I try to solve this system: e1 = H1[0, y] - H1[0, Y] e2 = H2[0, y] - H2[0, Y] with ...
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1answer
55 views

Mysterious RegionDistanceFunction::regp message

Bug introduced in 12.3.1 or earlier [CASE:4853257] I encountered a strange problem with RegionDistanceFunction. Consider this list of points (I'm forced to use <...
18
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1answer
1k views

Quiet doesn't work with FindRoot when using Brent method

Bug introduced in 9.0.1 or earlier and persisting through 12.3.1 or later The following has no solution: FindRoot[x == 1, {x, 0.25, 0, 0.5}] And Mathematica ...
0
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1answer
24 views

Outputting a warning message tag as a string, from a function running inside of a table

I want to print the messages or warning message tags for NonlinearModelFit when batch fitting data. For example, I will import and fit my data with something like <...
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2answers
87 views

Mixed Integer and real domain for variables

Does Mathematica support in Maximize function to put some variables belong to Integers and others to Reals I tried that but I have an error that this not implemented yet is there any way to do that ...
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0answers
53 views

logit ScalingFunctions

Having learned how to make symlog axes in this question, I was interested in the logit scale, the transforms of which are ...
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0answers
49 views

NDSolveValue BVP that encounters infinity

Problem setup: I'm trying to solve the following, quite hairy, first order BVP problem, with four unknown functions $\phi, \theta, p_\phi, p_\theta$, and boundary conditions at $\phi(0), \phi(1), \...
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0answers
23 views

[NDSolve error]: Equation or list of equations expected instead of 0.0001` in the first argument {(s^\[Prime])[t]==-0.325 s[t]-1.5 i[t] s[t]-1.5 [closed]

I am trying to have 5 PDEs with 5 unknowns, with code below However, I always receive the error message that Equation or list of equations expected instead of 0.0001` in the first argument {(s^[Prime])...
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1answer
90 views

Integral involving orthogonal functions (quantum harmonic oscillator eigenstates)

I have a question about the capabilities of the Integrate command for general parameters. We know that there is a system of functions: ...
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0answers
46 views

parallelization works only with one kernel

I am using MMA 12.3.1 on Ubuntu 18.04, and my license support parallelization. The default kernel is Local and I create another one named newKernel. when I launch MMA and choose Local to perform some ...
1
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1answer
71 views

How to force Mathematica throwing an error box intentionally?

When building a Module function, I try to throw an error box when this function facing some cases. But I don't know how to output this error box with ground methods. This picture is the Mma error bar ...
2
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0answers
37 views

How to remove "Qt issued a fatal error: QXcbConnection: Could not connect to display"?

I'm using Mathematica 11.2 on Linux. At the end of my script, I'm adding an Export command to export my results into a pdf file. I'm receiving the error msg: Qt ...
2
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0answers
65 views

NSum complaining of being non-numerical

I am trying to evaluate the sum $\sum_{k,l=1}^{30}\frac{1}{(k^2+l^2+1)^{5/4}}$ so I write NSum[1/(1 + k^2 + l^2)^(5/4), {k, 1, 30}, {l, 1, 30}] but I get a message ...
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1answer
203 views

I have just begun to use mathematica and was hoping someone could help me understand these error codes

" I have an assignment where I am required to use bisection or false position method depending on various inputs and I think I have a reasonable code that should work but I am not sure why I keep ...
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2answers
101 views

How to know, which constraint is being violated in linear programming problem?

my task is to minimize costs of dispatching various power plants in order to meet demand in a transmission grid. I solve the task as a linear programming problem with the help of Minimize[] function ...
11
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1answer
469 views

Problems encoding a Bayesian Network when using MultinomialDistribution

Short description of the encountered problem I am getting an error when using a MultinomialDistribution to encode a conditional probability distribution (CPD) ...
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0answers
119 views

NDSolve Error test failure at t == 5082.429032772312`; unable to continue

I am quite new to Mathematica, please help me struggling out of this question. I want to know how the HNO3 and HNO2 change in the system. first, I put the kinetics of some reactions: ...
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0answers
93 views

How to use NDEigenvalue to accurately estimate functional determinants?

Goal: Ultimately, I would like to find a trustworthy approximation for the ratio of the functional determinant of two differential operators using the formula $$ \frac{\text{Det}[\hat{D}_0]}{\text{Det}...
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1answer
67 views

ParametricPlot3D with variable plot limits

I would like to use ParametricPlot3D in the following general way: ParametricPlot3D[\[Sigma][u,v],{u,0,2Pi},{v,-f[u],f[u]}]. ...
0
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1answer
39 views

Differentiation inside recursive expression is not compatible with Manipulate [duplicate]

Define a sequence of function recursively: f[n_, x_] := D[Exp[x] f[n - 1, x], x] f[0, x_] = 1 Then, the following Manipulate ...
5
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2answers
181 views

Error message shows up when I start working on a previously saved notebook on Mathematica

I am new to Mathematica and hope this is not something very obvious. Whenever I start a new session on Mathematica and try to work on a previously saved file, Mathematica shows me the error message I ...
0
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0answers
208 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 ...
1
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1answer
146 views

How do I skip to the end of a loop when a compiled function yields an error?

This is something of a follow-up to my question In an iterative process, how does one simply bypass a step producing an error? which I have been so far (thick-headedly) been unsuccessful in ...
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1answer
45 views

Code Producing Power::Infty

I tried computing the following ...
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2answers
63 views

NDSolve Encountered non-numerical value

Below a sample of some first-order differential equations I try to solve. Although there are no non-numerical values involved in the equations, Mathematica systematically spits out "Encountered ...
0
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1answer
57 views

Simple help with DSolve

I am new to Mathematica in general. Just trying to solve a couple of coupled ODES. Dont really understand the error it throws. ...

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