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Mathematica : Recent Questions and Answers (Page 241)

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

How to solve the differential equation

I need to solve the differential equation DSolve[{(1-x)y''[x]==1/5 [Sqrt](1+y'[x]^2),y[0]==0,y'[0]==0},y[x],x] but the result given seems to be incorrect and returns an...

Asked on 08/06/2020 by Mertin

1 answer

Accelerate the speed of selection in Random

Tossing 4 points on a circle at a time, and calculate the chance of all 4 points on the upper part of the circle. ...

Asked on 08/04/2020 by kile

2 answer

How to calculate Gamma functions values for Quaternions using Mathematica?

How can we calculate the values for the Gamma function using Quaternions on Mathematica? For example:<<Quaternions`; (* load package *)Gamma[5] = 24N[Gamma[I]] = -0.15495 - 0.498016 IN[Gamma[1 + 2...

Asked on 07/31/2020 by GarouDan

3 answer

Implementing binomial expansion of (non-commuting) matrices in Mathematica

Given two matrices $A$ and $B$, their Binomial expansion is, in general, given by (see this page) $(A+B)^n = sumlimits_{k=0, k=n[2]}^n Bigg( sumlimits_{r=0}^k binom{k}{r} A^r B^{k-r}...

Asked on 07/31/2020 by Rob

1 answer

How to use PlotRange with GeoGraphics

I am using PlotRange to clip a GeoGraphics plot so that I can center an area of interest. However, I do this via trial-and-error because I have no idea...

Asked on 07/28/2020 by K7PEH

1 answer

Join two lists by using the first element

I have two lists, which as a simple example can take the form:l1 = {{a1,a2,a3},{b1,b2,b3},{c1,c2,c3}}l2 = {{a1,n1},{c1,n2}}How can I merge them by the first element in the list to...

Asked on 07/27/2020

1 answer

Reduce with inverse trig functions

c = 5.; b = 3.; a = 2.; len = 7.5;u[t_] := Reduce[ NSolve[(2 c + a Cos[t] - b Cos[u[t]])^2 + (a...

Asked on 07/25/2020

2 answer

How do we use mathematica to apply my average to this example?

I have defined a set function and an average. If you need help understanding my definitions, let me know. I will do my best to explain.QuestionHow do...

Asked on 07/24/2020 by RajanArak

1 answer

Export output to a text file

I have the following output obtained after optimizing the positions of geometry using Minimizecommand{x[1] -> 1011.07, y[1] -> 1127.56, z[1] -> 420.922, x[2] -> 940.095, y[2] ->...

Asked on 07/22/2020 by Natasha

3 answer

What am I doing wrong using FindIntegerNullVector?

Most of the time when I use FindIntegerNullVector with inexact numbers, I get useful results.But occasionally, it seems to miss finding a simple null vector.Example:a = 13.4414592345679;b...

Asked on 07/22/2020 by Stanley Rabinowitz

2 answer

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