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Mathematica : Recent Questions and Answers (Page 25)

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

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 08/29/2021

2 answer

how can I make a trend line fit close to (0,0) but not include (0,0) in my data?

I have five data sets, {4.88281 10^(-5), 0.0788}, {9.76563 10^(-5), 0.1014}, {0.000195313, 0.12455}, {0.000390625, 0.15594}, {0.0015625, 0.18587}. I was using EXCEL to add the trendline, but the x intercept is...

Asked on 08/29/2021

1 answer

High precision numerical solution of the nonlinear Volterra integral equation

Let consider nonlinear Volterra integral equation 5.1 from the paper An iterative multistep kernel based method for nonlinear Volterra integral and integro-differential equations of fractional order...

Asked on 08/29/2021

1 answer

Cache a function in mathematica

I have a function of one variable $f(x): mathbb{R}to mathbb{C}$ which is very difficult to evaluate. Single evaluations may take hours, and I need to use the function at...

Asked on 08/28/2021 by doublefelix

1 answer

How to study convergence of recurrence relations?

Is there a way to test the convergence of a recurrence relation in Mathematica? For example does this relation converge: $$a_{n+1}=a_n dfrac{n-dfrac{1}{4}+c^2}{-5+5c^2}$$ for some values of the parameter ...

Asked on 08/28/2021

0 answer

How o use singular value decomposition function to find the natural frequency and mode shapes

I have a matrix R which is having a dependency on ω, I am interested in finding the natural frequency and mode shapes of this matrix using SVD how to...

Asked on 08/28/2021

1 answer

Replace multiple variables using a list?

I want to calculate sum of derivativesof expressionF = Exp[(x*z - 1) f*b + (x - 1) (1 - f) b]from n-th to (n-k)-th, say k=4. The dummy...

Asked on 08/28/2021 by MichalCress

1 answer

Boole does not limit boundaries of interpolation function, which rise in problems when using NIntegrate for multidimensional integral

I tried to use the Boole function to limit the boundaries of an interpolation function I created when integrating, and noticed that despite this condition, the function will always call...

Asked on 08/28/2021

0 answer

Numerical Integration of MeijerG function in the form MeijerG[{{-2,-8.5,-3.5},{}},{{0},{-1.5}},theta]

When I evaluatea = MeijerG[{{-2, -8.5, -3. 5}, {}}, {{0}, {-1.5}}, theta] NItegrate[a, {theta, 0, Pi/2}]and allow the evaluation to run even for a day. it's not giving any...

Asked on 08/27/2021

1 answer

How to have a common input for different nb file

I have a set of five files. Each file takes a common input. But I need to change the input and run the files. The output of some file are...

Asked on 08/27/2021

1 answer

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