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Mathematica : Recent Questions and Answers (Page 3)

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

FunctionRange giving "false"

I was trying to find the range of a function I obtained in some context. The code is as follows FunctionRange[{1/2 (1 - Sqrt[-1 + 4 Abs[x]] Sqrt[-1 +...

Asked on 12/26/2021

1 answer

NIntegrate timing discrepancy

When I run the following identical numerical integralsNIntegrate[ Exp[2 I s] Exp[2 I t] ((Cos[s] - Cos[t])^2 + (Sin[s] - Sin[t])^2) + 1, {s, 0,...

Asked on 12/26/2021

2 answer

Why doesn't this function TransformedDistribution work?

According to the information in this post, we know that ${displaystyle z={sqrt {-2ln U_{1}}}cos(2pi U_{2})}$ follows a normal distribution, and the datas generated supports this view....

Asked on 12/26/2021

1 answer

How to solve the wave velocity in steel

In the simulation of stress wave propagation, I have the following two problems. First question: This question comes from page 69 of this book. The Lame equation for...

Asked on 12/24/2021

1 answer

Obscure explanation on Adaptive scheme of NIntegrate

I found the documentation of wolfram appears to be written hurriedly since it seems to contain a number of unclear statements, e.g., equation numbers were often missed, texts in codes...

Asked on 12/22/2021

0 answer

Symbolic second order derivative of real antisymmetric matrix in Mathematica

I would like to calculate the second order derivative of a function with respect to a matrix coefficient symbolically. Below is the first order derivative of S with respect to...

Asked on 12/21/2021

1 answer

The intersection point of a line crossing a surface is not displayed correctly In 3D Graphics

This is my code:Show[{ParametricPlot3D[{x, y, 0}, {x, -4, 4}, {y, -4, 4}, PlotStyle -> LightGray, Mesh -> None], ParametricPlot3D[{0, 0, t}, {t, -8, 8},...

Asked on 12/19/2021

2 answer

What is the difference between form and pattern in the documentation?

In the documentation, I see the term form and the term pattern. For example, see Cases and MatchQ for both usages. What is the difference? And is there a reference?...

Asked on 12/19/2021

0 answer

Solve with inverse trig functions (4-Bar Linkage)

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 12/19/2021

2 answer

Extrude a parametric plot along a straight line obtainning a closed surface

I made this parametric plotParametricPlot[ {x1 - 0.035 x1 x2, 0.0175 x1^2 + (1. + 0.0175 x2) x2}, {x1, -b2, b2}, {x2, -a2, a2}, Frame -> False, Axes ->...

Asked on 12/19/2021

2 answer

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