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Questions tagged [numerical-value]

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

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56 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 ...
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 ...
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 ...
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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 <...
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I have this ...
91 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 ...
67 views

Numerical precision problem

I have this simple code: ep = 1 - 80000000000 (-(199999/200000) + 1/E^(1/200000)) ep // N -8.27404*10^-8 ...
39 views

Finding zero linear combinations of polynomials (numerically)

I have two functions of real variables defined on two compact spaces ...
34 views

Best practice when encountering “Indeterminate” when applying a value equal to infinity

I have the following equation, which equals 1 for positive values of $n$, but at $n = \inf$ the equation becomes indeterminate. 4 n (1 - 1/2) 1/2 (1/Sqrt[n])^2 ...
105 views

Why does NSolve give different results in different version of Mathematica?

I am working on a problem with a colleague who uses Mathematica v.10.2 while I have v.11.0 Student Edition. We are solving the exact same equations but get two slightly different results. Why would ...
59 views

Numerical solution of a system of two exponential equations

I need to solve this two equations for x and y: ...