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Mathematica : Recent Questions and Answers (Page 31)

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

Correcting Import Errors presumably caused by unwanted whitespace characters

In scrapping data from a website that has a list of references searchable by the firstletter of the author. I have attempted to Import this as a single...

Asked on 08/18/2021

0 answer

Optimizing my code for Broyden's method

The following code is my attempt of employing Broyden's method for root finding on the function $f(x,y)=(e^{xy}-y^2-2,cos(x+y)+frac{1}{2})$. Where the first matrix is the Jacobian, then it...

Asked on 08/18/2021

1 answer

Partial fraction expansion with complex numbers

$$text{Apart}left[frac{1}{x^4+1}right]$$ Does nothing. How can I get it to expand it. Sometimes it is useful....

Asked on 08/18/2021

1 answer

Solve coupled equations in the steady state

I want to solve 16 coupled differential equations in the steady state.Among the answers, I only require two of the answers. But the Mathematica does not show me the...

Asked on 08/18/2021 by mehrosadat ebrahimi

0 answer

Create SwatchLegend with some elements including opacity

colorList = Flatten[{{Gray, Opacity[0.2]}, {Magenta, Opacity[0.2]}, ColorData["Rainbow"][(# - 1)/5] & /@ Range[5]}]This creates a list But I want a...

Asked on 08/17/2021

1 answer

How to do algebra on unevaluated integrals?

I am working with functions calculated from a set of general basis functions. f = a[x] + c1*b[x] + c2*c[x];g = Expand[f*f];h = Integrate[g, {x, -Infinity, Infinity}];This much...

Asked on 08/17/2021

3 answer

Can't this inequality really not be solved with Reduce?

Taking $alpha$ as given, I am trying to understand/know under which restrictions on $n$, the following holds:$$ 0 leq n+alpha Wleft(-e^{frac{-n}{alpha}} right) leq 1.$$i.e I...

Asked on 08/17/2021 by Banalaude

1 answer

Visualizing weighted directed graphs

I have a weighted, directed graph with 100 vertices and the maximal number of edges, 9900. Are there Mathematica tools or packages available to visualize which edges have large...

Asked on 08/17/2021 by stopple

2 answer

initial condition in finite element method

I want to apply the initial condition below to the linear element c(x; 0) = sin(10πx); if x in [0; 0:1] andc(x; 0) = 0; if x in [0:1;...

Asked on 08/17/2021

1 answer

Kernel crash with RandomInteger

Bug introduced in 11.2I am using RandomInteger to create sorted test data in the following way:lists = Sort /@ RandomInteger[10000, {10, 200000}];With Mathematica 11.3, the kernel crashes on me...

Asked on 08/17/2021 by sakra

1 answer

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