# Questions tagged [numerical-value]

Question relating numerical representations, operations and methods, including approximate results instead of exact symbolic results.

167 questions
Filter by
Sorted by
Tagged with
1k views

### Solve Laplace equation in Cylindrical - Polar Coordinates

Hey mathematica stackexchange!! I've got a (possibly stupid) problem. I've tried many things to no avail, and I've read every post I've found on Laplace's equation. Background: I'm trying to find the ...
63 views

### Laplace equation DirichletCondition ignored

My goal is to find out force between two parallel identical disks with Voltage difference. To solve this, I tried to use laplace equation. And below is my code. where R is radius of disks, d is ...
53 views

### How I can plot Vector3DPlot?

I want to reproduce the vector 3D plots as shown in the figure. It's in spherical polar coordinates (i.e. vector 3D plot on plane). The angle [Theta] is spherical coordinate is determined by the ...
22 views

### Dealing with small values inside numerically computed determinants

I'm working with a system that is sensitive to small changes in the parameters and it appears I found an oddity when calculating these determinants. Consider the following notebook that symbolically ...
54 views

### Checking NDEigensystem Results

I'm looking to verify the output of a call to NDEigensystem. I'm doing this by plotting the operator acting on the Interpolating Function outputs versus the ...
158 views

### Simplify appears to give different results

I have an issue with Simplify (and FullSimplify) giving a different numerical expression to the pre-Simplified expression. The function is an alternating sum of trigonometric quantities: ...
37 views

### What is used for the % symbol in mathematica? [duplicate]

Im new in mathematica i want to know logic about this program. I got this code: {{vo, vn, Ii}} = {vo, vn, Ii} /. %; i know that the syntax /. is for replacement but i dont know whats going on with ...
25 views

### Equation solving for approximate solutions when function has numerical integration in it

I have an equation that is of one variable lat and has a numerical integration in it t from 0 to 1. Let's say it's given by <...
70 views

294 views

I have this ...
88 views

### Having problems with using TableForm to format a table

I want to make a table of various values of the logistic curve given by l[x_] := 1/(1 + E^((-k)*(x - \[Alpha]))). In basic form, this is dead easy. However, I want ...
36 views

117 views

### Solve a system of 4-th order polynomial equations (numerically)

I have a function defined on $S^6 \times S^6$ (two spheres embedded in $\mathbb{R}^7$ individually). Let us call this vector $\vec{f}(\vec{x},\vec{y})$, where $\vec{x}$ and $\vec{y}$ are ...