Questions tagged [warning-messages]

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NDSolve. Can I use numerical ODE solution as PDE initial condition? [closed]

I want to use numerical solution of the ODE as an initial condition for the 1D linear PDE. But it seems Wolfram Mathematica has some issues with it. Let's consider an example. Here we have nonlinear ...
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2answers
78 views

Piecewise function within a vectorplot

I'm trying to do a vector plot with some code that includes piecewise functions and I keep getting the following error: Part::partw: Part 1 of {} does not exist. Here is the code: ...
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0answers
16 views

How do I set the “UnpackMessage” to be “True” permanently?

Looking at the top answer here, talking about packed arrays in Mathematica, I have realized that very often Mathematica silently unpacking an array explains mysterious slowdowns in my own code as well....
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24 views

step size effectively 0 error in ndsolve

I am trying to solve the following equations in Mathematica using NDSolve. 1.Given Data ...
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1answer
14 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
36 views

Warning when confluent hypergeometric function HypergeometricU is wrong?

From the definition as an integral (HypergeometricU/details), this function must be positive. However, it gives negative numbers in some cases with no warning of a potential error. For example, In[...
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How to copy a number from an error message? [duplicate]

Is there any way to copy a number from an error message and assign it to a variable, without manually doing it? For instance, I am trying to solve some coupled Differential equations as follows: ...
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2answers
127 views

Why does f[set_]:=AppendTo[set,5] not work when applying f to a set?

The following code works ccc = {}; AppendTo[ccc, 5]; ccc and gives the output {5} However, the following code does not work: <...
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1answer
39 views

Restore messages function to the default ones

Times ago I used the command Off[NDSolve::tag]. Now I've been forgetting which message I removed and I would like to restore it. Someone knows if is there a way to reset all the default messages ?
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3answers
139 views

Error with NIntegrate of a two variables integration

This is mathematica code for my integration, ...
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1answer
48 views

“Data not in notebook; Store now”

I'm getting a "Data not in notebook; Store now" message. Where is this data stored? I looked at my working directory and found nothing. I searched and could not find answer to this question ...
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0answers
22 views

My mathematica is broken, can someone help? (error “Kernet is not responding to Dynamic Evaluation”)

I have been doing some intensity plots on mathematica and it was working fine. It stopped responding when I tried to run 'Animate' command to try to see a simulation of the same intensity plots that I ...
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1answer
35 views

Define a function with a custom warning message

Is it possible to define a function with a custom warning message ? For example, ...
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1answer
54 views

ClassifierMeasurements returns strange errors

I am following the example listed on this page ResNet 50 to train a custom classifier and inspect the outcome with ClassifierMeasurements. My training set has 443 images from more than 30 classes. The ...
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1answer
79 views

Finding the exact symbolic formula for a function defined recursively

Let me introduce the problem. I have the following functions; The first one is defined recursively $h(i,j):=\frac{i-1}{j+1}h(i+2,j-2)$ and $h(i,0)=1$ where $i$ and $j$ are even integers, greater than $...
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0answers
24 views

A ChannelListen error message appears every time I start Mathematica. How can I stop this?

Every time I start up Mathematica, I am greeted with the following message: ...
3
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1answer
46 views

warning in Position + IntersectingQ

Why there is a warning message (with correct output) for the following code ? ...
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1answer
75 views

Plot Styling Errors (PlotLabel, PlotTheme, Inset not appearing)

Question: I'm trying to pull together a graph with labelled axes, a title, and an inset box with information relating to the plot such as the y-intercept (A in this code) and it's uncertainty. However,...
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0answers
44 views

DAE solver fails for system of coupled partial differential equations

I am trying to run the following code to solve a system of coupled differential equation: ...
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1answer
35 views

Part Specification is longer than depth of object & Transposing Errors

In trying to recreate results from another question I had asked (here) Code is: ...
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1answer
70 views

Why does FindDistributionParameters[] fail to converge for this distribution? [closed]

During testing my code for calculate parameters The following exception is thrown: ...
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1answer
46 views

How to refer a solve answer to NDsolve [closed]

I don't know how to refer a solution of Solve to compute it in NDSolve, here's my code ...
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1answer
67 views

Plotting an InterpolatingFunction outside its domain doesn't raise error messages

Let's make an InterpolatingFunction: if = Interpolation[Transpose[{#, Sin@#} &@Range[0, 4, 0.1]]]; As expected, evaluating ...
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1answer
91 views

Can you explain strange behaviour of a plot masked with $(2*(-1 + Abs[x]))/(-2 + Abs[Abs[-1 + x] - Abs[1 + x]])$?

I made a code which draws a plot of $5-x^2$ masked with a kind of rectangular function in order to brake the branches of parabola at the points ...
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2answers
275 views

How to plot multifactorial function?

The multifactorial function can be extended to the reals (see TheSimpliFire answer) like so: It follows that we can extend the multifactorial function to the reals ...
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0answers
24 views

NArgMin with Root functions

I'm trying to minimize an error function sumt to find some parameters S, s0, si : ...
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0answers
35 views

NMinimize - Strange “function value is not a number” error

I am seeing strange behaviour in some code I have written that uses NMaxmimize. Here is a minimal working example: ...
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0answers
55 views

Warnings while solving a system of coupled differential equations

I have a system of differential equations, given by ...
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0answers
26 views

Manipulate Error [closed]

I have the following code, which allows me to compile specific Manipulate plots on a separate plot. Unfortunately, I have a small syntax error which I can't seem to ...
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1answer
74 views

NIntegrate fails to give non-numerical value error, instead returns zero

When I evaluate NIntegrate[a(x - y)^2, {x, 0, 1}, {y, 0, 1}, AccuracyGoal -> 8] Mathematica returns 0 without giving a non-...
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0answers
89 views

DynamicModule Error when assigning Nothing to variable

Assigning Nothing to a variable inside Module works as expected: ...
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0answers
40 views

Error in function `WordList` in version 12.1

I want to list the number of different kinds of words in the English dictionary (Version 12.1 for Win10 (64-bit)): ...
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0answers
53 views

Writing a function that has two inputs

Write a function called DOTPRODUCT that has two inputs u and v, assumed to be two non-empty lists of numbers of arbitrary length, checks that the two lists are of equal length, prints an error message ...
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1answer
33 views

Error with ParametricNDSolveValue

Consider the following code: ...
3
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1answer
75 views

DSolve fails on initial value problem of 1st order ODE

I've been trying to solve this initial value problem using DSolve[]: $$ \frac{dy}{dt}=1+t\space \sin(t\space y),\quad y(0)=0, \quad t=[0,2] $$ ...
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1answer
76 views
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5answers
173 views

Finding polynomial coefficients returns Tag Plus is Protected [closed]

I'm trying to find the coefficients of a polynomial $P(x)$. Please see following equation. $$P(x+2)+P(x-2)=2x+8$$ CoefficientList[P(x+2)+P(x-2)=2x+8,P(x)] However ...
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0answers
41 views

Problem initializing xTensor package

I am using Mathematica 12.2 on Windows 10 and I am using the xTensor package for my tensor calculations. However, since today, I cannot run the xTensor package. I get the following error. Can anybody ...
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1answer
60 views

Too small to represent and Chop in inaccessible algorithm

Overview I want to apply a specified Chop function to every step in an function call in Mathematica (in my case LegendreP), ...
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0answers
91 views
0
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1answer
72 views

List Plot Error [closed]

I've produced this simulation of a superhetrodyne radio receiver. I'm pretty sure it's solid for the most part but I'm getting a list plot error. ListPlot::lpn: {{{1.,0.},{2.,0.00104953},{3.,0....
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0answers
44 views

NDSolve - interpolation or machine precision problem

For the following equations; $$\begin{align} \frac{\partial \text{NN}(t)}{\partial t}&=-\frac{(c \times\text{Sigma})}{\pi\times L\times \text{Omega}^2} \text{NN}(t) \times\text{Phi}(t)-\frac{\...
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1answer
111 views

When I define a Piecewise function containing a solution to a partial differential equation, the function cannot be evaluated numerically

I need to find an integral, in which there is a function YO [x_] = Sum[E^(((I h PI)/(λ f))x^2) Subscript[Y, h][x, z = 13.5], {h, - 5, - 1}] /. s where ...
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0answers
49 views

Mathematica gives $RecursionLimit to every single input [closed]

I have been using Mathematica Cloud for about 3 months. About twice a month I encounter a strange and perplexing error that I have, until now, overlooked as an immovable bug. Every function I input, ...
5
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1answer
115 views

'Block' with 'Compile' gives an error

Here is a minimal example to the problem I face when using Compile with Block: ...
2
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1answer
47 views

Getting error Solve::units [closed]

I'm trying to solve the following formula for i, given values for all other variables. There are two equations, the first one is a formula to show the transit ...
6
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2answers
695 views

What is the reason for failing to solve the following equation?

I have a simple differential equation $$ \frac{df(T)}{dT} = g(T)(f(T)-f_{\text{eq}}(T)), $$ where $g,f_{\text{eq}}$ are some smooth functions, and $T$ is an analog of time, but the evolution ...
1
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1answer
99 views

Find minimum of a function defined via NIntegrate [closed]

I need to find the minimum of a function f(t) = int g(t,x) dx over [0,1]. I used g[t_, x_] := *huge expression* f[t_?NumericQ] := NIntegrate[g[t, x], {x, -1, 1}] ...
5
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1answer
186 views

Step size is effectively zero

I've been trying to solve Bodewadt flow equations which is a system of differential equations. $$\begin{align*} F^2 - G^2 + HF' - F'' + 1 &= 0 \\ 2GF + HG'-G'' &= 0 \\ 2F + H' &= 0 \end{...
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0answers
53 views

How to solve this linear complementarity problem with NDSolve or other functions? The arguments should be ordered consistently

I want to find a numerical solution of $\omega(t,q)$, where $t\in[0,T]$ and $q\in[0,N]$. $q_t$ is a determinstic w.r.t $t$, other unmentioned parameters can be fullfilled or given by the user. I met ...

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