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Mathematica : Recent Questions and Answers (Page 112)

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

Smooth Boxcar function (Rectangle Pulse function)

There are some answers on how to get a smooth squarewave function. But I would like to have a smooth boxcar function or rectangle function with 2 different widths.: wup,...

Asked on 04/28/2021

2 answer

ReplaceAll works and does not work for the same expression

I will give two cases, where the rule replacement works in the first one and does not work in the second one, but they are essentially the same! Consider the...

Asked on 04/27/2021

1 answer

Inverse function and Integral: How to simplify this DSolve output?

I'm trying to DSolve these equations with each other:q1[t_] := 3 (y'[t]/y[t])^2 - (1/(y[t]^3)) - (1/(y[t]^4)) - 1q2[t_] := -2 y''[t]/y[t] - (y'[t]/y[t])^2 - (1/(3 y[t]^4)) + 1q3[t_] :=...

Asked on 04/27/2021

2 answer

Improvement of code precision using NDSolve for Differential-Algebraic equation

I'm trying to solve a system of 24 non-linear Differential-Algebraic equations (DAE). I'm using the command NDSolve in Mathematica to solve this system, using this command, the error is too...

Asked on 04/27/2021 by MMS

1 answer

How to compute many sums or tables efficiently

I have some questions about programming in Mathematica and I would really appreciate it if you could help me. I wish to plot the following function against the variable X,...

Asked on 04/27/2021

1 answer

How can the result of that limit be expressed completely?

I want to find the expression of the following limit:Limit[Power[1 + RealAbs[x]^(3 n), (n)^-1], n -> Infinity](* ConditionalExpression[1, (x >= 0[And]log(x)<0)[Or](x<0[And]log(-x)<0)] *)But the result is not complete. The reference...

Asked on 04/27/2021

1 answer

help in plotting Minimize function

Please help in plotting the following function versus $c2 in [-1,1]$$$S = mathop {min }limits_{theta 1,theta 2,phi 1,phi 2} F(c2,theta 1,theta 2,phi 1,phi 2)$$ where ${theta...

Asked on 04/27/2021

1 answer

Regarding validity of expressions involving inequlaities

The expression|log(1+x) - log(1 - x)| <= |x-y| /{1+|x-y|}, 0<x<1, 0<y<1is valid. How we can prove using Mathematica (either graphically or using construct with x = y and...

Asked on 04/27/2021 by meraj

2 answer

Boundary conditions at infinity for 1+2D wave equation in Mathematica 7

To solve a waves equation, I need to define some boundary conditions. The wave is propagating on an infinite plane, and it's not a membrane fixed on some fixed...

Asked on 04/27/2021

1 answer

How do we find how many values for a Smooth square root?

this question is from the Eulers projectThe positive integer is called square root smooth if all of the prime factors it has are less than its square root.Including...

Asked on 04/26/2021

1 answer

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