Questions tagged [warning-messages]
The warning-messages tag has no usage guidance.
1,241
questions
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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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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
27 views
Suppress "integral does not converge" error message
Is there a way to suppress this error message and beep?
7
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1answer
95 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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62 views
NIntegrate and MaxRecursion
I'm using NIntegrate to get the value of a very complicated function f[k,T,M], where T and <...
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77 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
79 views
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38 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:
...
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1answer
257 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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42 views
What do do if Mathematica stops without error messages?
I am trying to run the relatively simple code
...
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1answer
53 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 <...
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2answers
85 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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51 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
47 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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1answer
82 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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0answers
21 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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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 ...
2
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0answers
63 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 ...
2
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0answers
29 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 ...
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49 views
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113 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:
...
4
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0answers
92 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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31 views
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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
179 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 ...
1
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1answer
70 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 ...
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54 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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2answers
56 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 ...
2
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1answer
98 views
NIntegrate fails to solve a double oscillatory integral
I need to compute the following integral:
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30 views
Why do I get the (NMinimize::nrnum) error and how to fix it?
I have an energy function which depends on the angles of the electrons({x} symbol for theta) and phase of electrons({y} symbol for phi). I am using NMinimize to minimize the energy with respect to {x}...
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1answer
85 views
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1answer
74 views
<<Notation` raises warnings
In a completely fresh kernel (after Quit[]ing), when I do
<<Notation`
I am met with
...
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0answers
57 views
Error while using NDSolve
I'm trying to solve a PDE using NDSolve.
cfun = NDSolveValue[pde, c, {t, 0, tEnd},
DirichletCondition[c[t, x] == 5, x == 0], {x} \[Element] mesh];
I get the ...
1
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1answer
72 views
NDSolve::ndsz: step size is effectively zero; singularity or stiff system suspected + other warnings for system of differential equations
I'm trying to solve a set of differential equations numerically to get a 3D plot, but I am getting multiple different warnings and errors. First of all, here is the code:
...
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1answer
43 views
ArgMax : Variable Domain Error [closed]
I'm attempting to utilize the ArgMax function, but am receiving the error "ArgMax::vdom: Variable domain ... should be either Reals or Integers."
...
0
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1answer
53 views
NIntegrate allegedly evaluating to non-numerical values
I'm getting non-numerical-evaluation error messages despite not having any symbolic variables in my code.
Here's a MWE representative of what I'm doing:
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8
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1answer
325 views
What should I make of "Simplify: Time spent on a transformation exceeded -4.03955*10^12 seconds"?
Running version "12.0.0 for Microsoft Windows (64-bit) (April 6, 2019)", in case that matters. I fed Mathematica the command
...
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71 views
How to change Machine Precision digits to meet the tolerances
I am trying to solve for Tcm and Mag by solving nonlinear equations using FindRoot command using following code:
...
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1answer
66 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]}].
...
3
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1answer
66 views
Even though the fit seems correct, NonlinearModelFit throws a failed convergence error
Consider the following data
...
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1answer
80 views
Differences in Mathematica's behaviour with identical functions
I have three functions whose identity was verified, but WM doesn't behave itself equally with them.
The code is:
...
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0answers
34 views
Print[] text in the style of Message[]
I would like to imitate the aesthetic style of Message[] text, but using Print[], and customising the colour. The output I ...
0
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1answer
71 views
Errors relating to MatrixFunction
I ran this and got some errors. Does anyone know how to solve this?
First I want to caluclate A^2(A+I) with ...
0
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1answer
41 views
Mathematica Not Loading
Mathematica 12 was working fine, but after recent updates (Nvidia drivers and Windows 10) the kernel will load happily, but when trying to load Mathematica the screens hang and I'm greeted with a ...
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0answers
47 views
How to apply percent error to list of data [closed]
Say I have a list of data. data = {1,2,3,4,5} and those data values were measured with an instrument that has a listed 3% error. I can apply this per value with ...
2
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0answers
58 views
How to produce an error message for each argument?
I want to print a helpful message for every wrong input. How do you compactly implement a function with custom pattern constraints, default values and error messages for each argument separately? For ...
1
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1answer
106 views
Solve using PolyGamma function
I am trying to solve for the value of y.
My code is:
x = 0.165;
f = -Log[y] - PolyGamma[0.5 + 0.2*(x/y)] + PolyGamma[0.5];
Solve[f == 0, y]
Running gave me
...
1
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1answer
43 views
The expression Cycles[{}] cannot be used as a part specification?
I am trying to do the following:
S = GroupElements[SymmetricGroup[4]];
Nest[PermutationProduct[S[[2]], S[[#]]] &, 2, 3]
But this yields the following errors:
...
