# Questions tagged [error]

Questions seeking help understanding error messages and fixing errors.

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1answer
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### Evaluation of an Error function

How to evaluate df function in the following code sample? ...
1answer
62 views

### Stiffness and NDSolve error NDSolve::ndsz:

I have a 2nd Order ODE problem I am trying to solve numerically in Wolfram: $$(k^2-1+\frac{2x}{x^2+c^2})\frac{d^2y}{dx^2}+\frac{c^2-x^2}{c^2+x^2}\frac{dy}{dx}+x\frac{x^2-3c^2}{(x^2+c^2)^3}y=0$$ ...
0answers
55 views

### How to solve “Coordinate should be a triple of numbers”?

Something seems different with duplicated question "How to solve this error? “should be a triple of numbers or a Scaled form.” ", MMA tips may tell that Abs do not ...
0answers
43 views

### Root mean square between data and function

I'm trying to find out RMS between data and function. ...
0answers
128 views

### NetTrain on a UNet with a NVidia Quadro P5200 GPU

I am trying to train a UNet on my laptop (Lenovo P72) and I obtain the following error when I use NetTrain on it: CompiledFunction::cfta: Argument {Mean[LibraryFunctionError[LIBRARY_FUNCTION_ERROR,...
0answers
43 views

### Different integration results when TrigToExp used

I am trying to do a double integral over a domain $x \in (\theta_1,\theta_2), y \in (0,\theta_1)$. Instead of doing a definite integral I am doing an indefinite integral and taking limits. All that is ...
2answers
76 views

### How to check for underflow, and find a constant to correct it?

In a programme I'm running, at a certain point there's a multipplication of variables that gives underflow... For example $c=c_1\times c_2$. Is there anyway to check if that multiplication gives ...
0answers
154 views

### Bug in the classification optimization algorithm for large data sets

I believe that I encountered a bug in Mathematica 12. The Classify[] function throws errors when simultaneously: The training set has significantly above $10^5$ ...
2answers
116 views

### Mathematica puts function with certain constants on hold, why? [closed]

Here, I probably have a trivial case on how to use functions in Mathematica but I can't figure it out with the help of the Mathematica pages. I define the following function: ...
1answer
53 views

### Finding the area of Gaussian 90% error ellipses

I'm trying to find the area of 90% Gaussian error ellipses, which should be easy because there is a direct method to find the length of the semi-major and semi-minor axes, found from multiple ...
1answer
100 views

1answer
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0answers
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### NDSolve::bvdae error when using NDSolve

I am trying to solve this complex problem. ...
0answers
64 views

### Solving a PDE solved by the method of lines giving a warning about bad local spatial error estimate

I use the method of lines to solve the PDE ...
0answers
28 views

### Why is an integration error appearing during this code?

I'm really confused about this to be honest. If i evaluate approx[x,k] for some k, and then input the list into the Plot function, I get a plot. But if I try to use approx[x,k] directly, I get an ...
0answers
21 views

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1answer
62 views

### Plot shows up as blank output line

Let me start by saying this is NOT one of a thousand duplicates of the function not showing up on the plot. Mathematica has been working fine for the last 2 years, and then all of a sudden, ...
1answer
78 views

### My version of PowerMod breaks down around 10^308

I have been trying to write a function that duplicates PowerMod[a, b, n], computing a^b mod n...
1answer
43 views

### Typing Control-6 makes text cell disappear

This morning, I opened a document I worked on last week, and all the lines of text that had Control-9 functions in them where the function involved a power written by typing Control-6 were completely ...
2answers
33 views

### My function for computing a partial derivative generates an error message [closed]

Apologies, I'm still new at Mathematica. I have defined the function ...
1answer
72 views

### Specifying $0^+$ as the lower bound of an integral [closed]

Consider the following evaluation. Integrate[1/Sqrt[x], {x, 0, 1}] (* 2 *) The integral is right only if the first extreme of integration is $0^+$. I want to ...
1answer
35 views

### Why am I getting errors from NMaximize? [closed]

I tried to use the function that is given in 1 in order to get the FWHM of some expression I got from solving a system of linear equations. This is the function for calculating FWHM: ...
2answers
255 views

### “Graphics is not a Graphics primitive or directive.”? [duplicate]

I looked through the forum but none of what I've found is helping. ...
1answer
106 views

### Installing R for use with V11.3 on Windows 10

I can't install R on Windows 10. I tried some solutions that I found on the Internet, but they did not help. ...
2answers
70 views

### Eigenvalues error: “The method ”Banded“ accepts only sparse matrices with elements that are machine-real or machine-complex numbers”

I'm having one issue with the Eigenvalues function in some code priorly discussed here. There the example is tridiagonal, but here, let us consider this simple ...
0answers
134 views

### How can I do a faster integration?

I have this part of my code, which takes forever to run. Does anybody know how to make it faster? Using NIntegrate I face error: "NIntegrate::eincr: The global error of the strategy GlobalAdaptive ...
1answer
69 views

### Finite element mesh generation with specified coordinates [closed]

I am trying to use Mathematica's FEM capabilities, but I want to generate my own QuadElement mesh. (The key word in here is trying.) ...
0answers
42 views

### Confusing errors using predict to map between matrices

I'm messing around with the new features involving machine learning in Mathematica 11, and one easy thing to try is to make a machine learn the matrix exponential function. The first silly idea I had ...
1answer
117 views

### Want to remove unnecessary message

Manipulate[ ParametricPlot[{t, t}, {t, 0, s}], {s, 0, 1, 0.1}] This code is working in Mathematica, but generates messages (...
2answers
137 views

### What's wrong with this cross product of two vectors? [closed]

x = {{a},{b},{c}}; y = {{d},{e},{f}}; Cross[x,y] Whe trying to evaluate this expression, I get the error ...
0answers
54 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? ...
0answers
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3answers
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### 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 ...