Questions tagged [error]

Questions seeking help understanding error messages and fixing errors.

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3answers
120 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
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1answer
169 views
5
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1answer
125 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
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1answer
36 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
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1answer
90 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
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1answer
130 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
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0answers
77 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
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0answers
52 views

JordanDecomposition: Error Mesage eivn

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

Create Compiled Function

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

NIntegrate weird behaviour inside a function

I wrote this little function ...
0
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1answer
313 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
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0answers
29 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
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0answers
56 views

ProteinData Error: “Cannot import data as PDB format” [closed]

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
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1answer
148 views

On double summation with Mathematica

Today I wanted to evaluate this sum using Mathematica: $$f(a,b):=\sum_{(k,l)\in\mathbb{Z}^2,\ l\ne0}\frac{1}{(2 i k a \pi + l b) (2 i (k - l) a \pi + l b)}$$ ...
1
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1answer
67 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
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2answers
179 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
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2answers
175 views

Problem with error plot

In error list plot what command I will use for denoting the range of X axis? ...
0
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0answers
61 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 ...
2
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0answers
32 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
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1answer
160 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
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2answers
186 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
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1answer
55 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
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0answers
50 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
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0answers
63 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
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1answer
95 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
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2answers
100 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? ...
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2answers
83 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
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0answers
56 views

Integral converges only if Mathematica kernel has just started?

After just starting Mathematica (or quitting the kernel) if I run: ...
2
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1answer
59 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
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1answer
36 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
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1answer
57 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. ...
2
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0answers
142 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
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0answers
66 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
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1answer
170 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
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1answer
34 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
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0answers
41 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
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1answer
53 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
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1answer
147 views

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

This list will produce a circular orbital plot: ...
-1
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1answer
98 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: ...
1
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2answers
175 views

Getting error NDSolve::ndsz from my ODE

I'm trying to figure out why I am consistently getting singularity error when I'm trying to solve an ODE using NDSolve. Any help will be appreciated. ...
1
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1answer
162 views

How to change the integral variable and integral upper/lower limit?

I am dealing with the symbolic operation of taking the antiderivative, e.g., Integrate[f, x] (where $f$ represents a complicated function which cannot return ...
1
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1answer
52 views

An error of unequal length when using Transpose[y]? [closed]

Why do I get this error? I just clicked shift+enter in the y and it appeared. https://i.stack.imgur.com/IAKs8.png This is the data ...
1
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0answers
45 views

Mathematica stops showing messages, how to get them back?

I realized that, for an identical expression, sometimes I get an error message and sometimes I don't. If I then shut down and restart Mathematica, messages are back. How can I get messages back ...
1
vote
3answers
498 views

Wolfram Mathematica on mac os Mojave

I found out that Apple stop support programms with 32-bit architecture in new Mac OS Mojave, has anyone already updated??? I want to see new dark mode, but if WM will stop working it will be a problem....
2
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3answers
501 views

Solve piecewise function

I have two piecewise function ...
1
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1answer
80 views

Estimation of the error for zero degree of freedom fit with error bar

I am performing a fit on experimental data with zero degree of freedom but with error bar using NonlinearModelFit: ...
1
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1answer
67 views

Compile errors after reloading of laptop contents after challenging MacOS Mojave installation

I tried (foolhardily, it appears) installing macOS Mojave Version10.4 on my MacBookAir, but encountered major problems--that seemed to have been (finally) fixed after a reinstallation and reloading of ...
1
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1answer
38 views

ScalingFunctions produces a warning on ListDensityPlot

Using ScalingFunctions in a ListDensityPlot produces a warning "An unknown option name has been used." Yet, the code still seems ...
1
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2answers
99 views

Solving an ODE with a sign/step function which depends on the time derivative

I'm trying to solve a set of ODEs with a Heaviside step function which depends on the sign of the derivative of the function. This is a simplifying example of what I'm trying to do ...