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Mathematica : Recent Questions and Answers (Page 225)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

Mathematica shuts down when calculating this limit

Bug introduced in 9.0.0 and fixed in 9.0.1I'm trying to compute this limit:Limit[E^-(r^2)^(2*n)*r*2*Pi, n -> Infinity]But, when I run the code above, Mathematica shuts down. I get a warning...

Asked on 12/01/2020 by An old man in the sea.

1 answer

pivot_wider for Datasets

I'd like to transform this dataset:Dataset[{ <|"Name" -> "Steven","Born" -> 1980, "Year" -> 2017, "Score" -> 115|>, <|"Name" -> "Steven", "Born" -> 1980, "Year" -> 2018, "Score"...

Asked on 12/01/2020 by Stephan

3 answer

Computation of operation count for the numerical evaluation in Mathematica

Is there any way to find the complexity of computation in Mathematica? There is a command in Maple that computes the number of multiplications, storage, and assignments. Is there any...

Asked on 12/01/2020 by majamir

0 answer

Most efficient way to solve partly integer optimization problem

Let $0 < u < v < w < 10$ be natural numbers. I want to maximize $r$ across all choices of $u, v, w$ subject to...

Asked on 11/30/2020

3 answer

How to set correctly the initial conditions with Infinity?

I have two functions given by the following differential equation system:eqn={ T''[t] == (2 m)/(2 R[t] (R[t] - 2 m)) T'[t] R'[t], R''[t] == (2 m (R[t] - 2...

Asked on 11/30/2020

0 answer

How do I export a movie in AVI or Mov without altering the color and resolution?

Lossless movie export. How do I do that ? Or how do I export such that the color doesn't change. AVI makes changes the color and mov changes resolution and...

Asked on 11/30/2020 by Chris Django

2 answer

Understanding the output of a calculation

I have a simple question about the output of a calculation. I have written a function which is a sum of 3j-symbols and Clebsch-Gordan coefficients in which I sum over...

Asked on 11/30/2020

1 answer

Revolution around the x-axis of solution to a nonlinear differential equation

I have the following differential equation: $$picdottext{y}(x)^2=sqrt{1+text{y}'(x)^2}tag1$$ With the initial condition $text{y}(0)=1$. Now, I want to plot the solution in order to obtain the solid of revolution when...

Asked on 11/30/2020

3 answer

How to find expansion coefficients in Fourier-Legendre

I am trying to find the coefficients for the Fourier-Legendre expansion of a potential. My goal was to obtain the coefficients as expressions in terms of x and y. I...

Asked on 11/30/2020

1 answer

Problem with FormulaLookup and FormulaData

I'm not getting an answer when I type either:FormulaLookup["BinomialDistribution"]orFormulaData["BinomialDistribution"]Can't be my fault because I get the correct answer when I type:FormulaData["BoseEinsteinDistribution"]Ideas? Suggestions?...

Asked on 11/30/2020 by OKCarl

0 answer

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