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Questions tagged [error]

Questions seeking help understanding error messages and fixing errors.

0
votes
2answers
33 views

What's wrong with this cross product of two vectors?

x = {{a},{b},{c}}; y = {{d},{e},{f}}; Cross[x,y] Whe trying to evaluate this expression, I get the error ...
0
votes
0answers
41 views

double Integral in complex number field

The following expression is an expansion of Hypergeometric2F1 function from the above expression with the help of 9.113(in 'Table Of Integrals, Series And Products'). but I got different results.WHY? ...
1
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0answers
15 views

How would I obtain error information on a $Failed GeoElevationData?

The following code returns an error: GeoElevationData: with no description of the error. I think this error may be because I am asking for elevation data that is ...
1
vote
2answers
32 views

How can I get LanguagesFractions data in different years?

I want to do that. But it failed. May I change my code? Or Where can I get these data?
0
votes
1answer
36 views

RegionPlot evaluating NIntegrate before assigning variable values and resulting in non-numerical integrands [duplicate]

I am trying to find the regions where the integral of a function a function is larger than a certain quantity using RegionPlot. For simplicity's sake, let's say the intergal I am looking to plot is is ...
0
votes
0answers
25 views

Using ErrorBars with ListLogPlot in Mathematica 11 [duplicate]

I am trying to insert error bars in a plot with a log scaled y-axis with ...
0
votes
0answers
50 views

Non-autonomous ODE use NDSolve, error: Step Size is effectively zero; singularity or stiff system is suspected

I have seen this error NDSolve::ndsz many times when I use NDSolve to get the solution of a non-autonomous ODE. I try but all ...
0
votes
0answers
48 views

Create Compiled Function - Matrix Initialization

I am attempting to compile the following function: But I receive the following error messages: How should I initialize the matrix Vw to enable the assignment to Vw[[1,1]]? ...
5
votes
3answers
153 views

Why are the options given for IconData causing errors when used?

Reported to Wolfram Technical Support [CASE:4212712] Using Options on IconData reveals: ...
-1
votes
1answer
51 views

Protected tag error using NDsolve [closed]

I have been successful at solving the PDE when I have specified the $r$ I am using, but now when I try and allow $r$ to be a variable and input its value in a function I am getting all sorts of errors ...
1
vote
3answers
63 views

Numerical integration converging too slowly. how to over come this

I have a function U1 which contains a linear combination of trigonometric function, I wanted to Numerically integrate this function U1. Since each trigonometric functions associated with some unknown ...
3
votes
1answer
136 views
4
votes
1answer
68 views

FindEquationalProof with Logic in Wolfram Mathematica

I try to "make" proof in Wolfram Mathematica. Thats a proof: if a->b and b->c then a->c I tried ...
0
votes
1answer
22 views

What is this error when doing Plot[ArgMin[Norm[…,p]],…]?

When doing Plot[ArgMin[Norm[x - {-3, -1, 0, 5}, p], x], {p, 1, 3}] I get this error message: ...
1
vote
1answer
38 views

Why is part of the output “Null”? [closed]

Whenever I execute the code, portions of the output are null. How can I fix this? I am not sure the extent to which the result is invalid because I am not entirely familiar with the null output, ...
1
vote
1answer
86 views

NDSolve: method of lines: unexpected error: insufficient boundary conditions

As a test of my ability to master the Method of Lines I tried to NDSolve the PDE's system $$\partial_t \varphi = \varpi\qquad\partial_t\varpi=\frac{1}{r}\partial^...
1
vote
0answers
57 views

Why is my Mathematica notebook resetting all my previous computations after some hours?

I am using Mathematica 11.1. This morning I started some calculations in the hope that when I come back from work, they will be finished and I can get on with the rest of my project. Indeed, when I ...
0
votes
0answers
45 views

JordanDecomposition: Error Mesage eivn

I want to calculate the JordanDecomposition of the follwoing matrix: That is ...
0
votes
1answer
81 views

Create Compiled Function

I am trying to create a compiled version of this function: ...
0
votes
0answers
37 views

NIntegrate weird behaviour inside a function

I wrote this little function ...
0
votes
1answer
46 views

NIntegrate: The integrand has evaluated to non-numerical values for all sampling points in the region with boundaries {}{}

I encountered a problem with the NIntegrate function while simulating a physical situation. The expression is quite messy, but it is just an integration over a polynomial so it should be possible. I ...
0
votes
0answers
15 views

NDSolve: Method of Lines: same grids for spatial discretization: error: stiff system_zero step size

How can I modify bbgofrey's answer so as to use $n+1$ grid points for variable $y$? My code ...
1
vote
0answers
31 views

ProteinData Error: “Cannot import data as PDS format”

I'm trying to use the mathematica examples for plotting Proteins: But when I type the command I get the next error: How can I import data as PDB format?
1
vote
1answer
126 views

On double summation with Mathematica

Today I wanted to evaluate this sum using Mathematica: $$f(a,b):=\sum_{(k,l)\in\mathbb{Z}^2,\ l\ne0}\frac{1}{(2 i k a \pi + l b) (2 i (k - l) a \pi + l b)}$$ ...
0
votes
0answers
24 views

Linking multipage forms together

I am trying to develop a web form wherein the first page asks users how many cities they would like to compare, and the second page dynamically creates that many input boxes. Once the user inputs the ...
0
votes
2answers
86 views

I want to erase the error

Error message does not disappear. I can not solve the same number of solve expression and variable. Please tell me some advice. ...
1
vote
1answer
34 views

error list log plot

In error list plot what command I will use for denoting the range of X axis? ...
0
votes
0answers
24 views

Problem with small program: Error: “Charting Private pvar”

Im in the making of a smaller self-running application. I have made a small piece of the program as it has to look in the end. However, sometimes when i change some of the input for either "demand" or ...
1
vote
0answers
23 views

Find errors in collapsed notebook

I usually keep my notebooks collapsed to make understanding what's going on easier. The problem is that if there's an execution error, I have to expand everything in order to even know that there was ...
1
vote
1answer
130 views

NDSolve:PDE system, initial-boundary value problem:warning:NDSolve::mconly: For the method NDSolve`IDA, only machine real code is available

I tried to NDSolve the PDE system $$\partial_t w =x\cdot w\quad\quad\partial_z x=w$$ for $$(t,z)\in[0,1]\times[0,\pi]$$ with boundary conditions $$x(t,0)=w(t,0)=w(t,\pi)=0$$ and initial conditions $$w(...
3
votes
2answers
152 views

NDSolve:Coupled PDE's, initial-boundary value problem: unreasonable “insufficient number of boundary conditions” error

I tried to NDSolve the PDE system: $$\partial_t y = x\partial_z w \quad\quad \partial_t w = \partial_z y \quad \quad \partial_z x=w $$ for $$(t,z)\in[0,1]\times[-1,0]$$ with initial conditions $$x(...
0
votes
1answer
52 views

Increase in area under the curve as standard deviation decreases? Not what I expect

Suppose I have a PDF with mean a and standard deviation b defined as below. As the value of k increases, a should decrease, while b should also decrease. This should cause a decrease in the output, ...
0
votes
0answers
47 views

problem to solve a non linear equation

variable[[i]]-(1/Pi)((t/2 - 1)*(Pi-2Sqrt[t-1]+2/3(t-1)^(3/2))+(-1+4/(3t)+4/(3t^2))Sqrt[(t-1)])==0 This is the equation but the problem is that the solution is ...
5
votes
0answers
54 views

How to prevent the message: Not enough memory to display a cell

While running a single-cell GUI application that repeatedly changes and refreshes its content I got this message: There was not enough memory to display a cell... I found in this old MathGroup thread ...
0
votes
1answer
84 views

Main function in my package doesn't work

I am new to Mathematica package development and I have been trying to write and run some simple packages to get a feel for it. I wrote the following package. My aim is to define a package which has ...
0
votes
2answers
94 views

Integrals of a Fourth order differential equation: Part B

I want to continue this topics (enter link description here): Is it possible for us to get the value for integrals of a Fourth order differential equation (But) which includes a constant parameter? ...
0
votes
2answers
65 views

Integrals of a Fourth order differential equation: Part A

Is it possible for us to get the value for integrals of a Fourth order differential equation in MMA. I attach the code that i have used in MMA: ...
0
votes
0answers
51 views

Integral converges only if Mathematica kernel has just started?

After just starting Mathematica (or quitting the kernel) if I run: ...
2
votes
1answer
53 views

DifferentialRoot with parameters that “are not exact numbers”

In the course of developing an answer to 185859, I encountered the following difficulty. With ...
1
vote
1answer
26 views

Getting error RSolve::dsfun [closed]

I an trying to solve a recursive formula and find the explicit representation of $a$. $a_0 = 1$ $a_{n+1} = 3 \sum\limits_{i=0}^{n} a_i$ When I evaluate ...
1
vote
1answer
48 views

Combining ListLinePlot graphics with Show

I'm new to Mathematica working on a project for school. I'm trying to show the deflection of a cord over time by breaking it up into 14 points and plotting the x,y coordinates of each point over time. ...
1
vote
0answers
93 views

Why this issue with Workbench?

I just installed the current version of Eclipse and then the current version of Workbench 2 by following the online instructions at the Wolfram site for installing it as a plugin. I can create a ...
1
vote
0answers
59 views

OpenMATLAB[] hangs

I just migrated my Mac from one machine to a new one and it seems like MATLink is broken now. When I call OpenMATLAB[] in Mathematica the command hangs forever. I ...
-1
votes
1answer
84 views

Solve equation: Exponent is out of bounds for function PolynomialGCD

I am trying to solve the equation below but it returns this error :Exponent is out of bounds for function PolynomialGCD". I would be gratuful if you someone help to solve this equation. ...
1
vote
1answer
32 views

Is there a problem using Check and Quiet with LinearModelFit?

I am using LinearModelFit in conjunction with Quiet and Check because I need to control when ...
0
votes
0answers
34 views

NDSolve dealing with message infinite expression and non numerical value non homogeneous differential equation

I'm trying to solve the following differential equation with some specific conditions ...
0
votes
1answer
52 views

How to optimize this script?

fx8350, 16Gb ram just need to solve this: 13, 19, 19, 16, 26, 33, 26, 31, 5, 24, 21, 34, 35, 35, 35, 20, 7, 12, 18, 17, 6, 8, 15, 24, 2, 17, 15, 22, 29, 15, 21
0
votes
1answer
143 views

The movement of the point in orbit is one hundred long timesteps

This list will produce a circular orbital plot: ...
-1
votes
1answer
82 views

nlnum problem of NDSolve

I'm having a difficulty to NDSolve a ODE due to nlnum (according to the error message). Below is the code I have. First of all are functions: ...