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Mathematica : Recent Questions and Answers (Page 136)

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

Why does CUDAQ (from CUDALink) download data from Wolfram servers?

I understand why functions like ElementData or CountryData need to download up-to-date data when first launched. However, when trying to use CUDA for the first time in Mathematica, I ran:...

Asked on 03/26/2021 by F'x

1 answer

Function that returns disjoint sublists

I have to write a function that takes two arguments: a list list and an integer n. The function should return another list called result with sublists of length n....

Asked on 03/26/2021 by noob3000

2 answer

How can I direct sum matrices into the middle of one another another?

I would like to execute the mathematical operation of the direct sum of matrices in the case where the matrices are not appended one after the other along the diagonal,...

Asked on 03/26/2021

1 answer

Parse a JSON file, but failed

My ProblemSome people gave me a JSON file, which is exported from a camera. He asked me to parse the JSON file, and extract the value to each key. However,...

Asked on 03/25/2021

1 answer

Conditional replacement element-wise

I have a $4times 4$ matrix (symbolic). It has a variable, say jj, which should be $1$ for diagonal and $0$ for non-diagonal entries. I need to...

Asked on 03/25/2021 by Rafi

3 answer

Shooting Method with extra Unknown Condition

I've been trying to solve a system of 3 coupled 2nd order ODEs, for a real variable $x$, $0geq xleq infty$. The equations are the following:begin{align}...

Asked on 03/25/2021 by MLPhysics

1 answer

Difficulty when trying to find roots to high accuracy

I'm working with the logistic map $f(x,lambda)=4lambda x(1-x)$, and iterations of the logistic map $f^{(2^n)}(x,lambda)=f^{(2^{n-1})}(f^{(2^{n-1})}(x,lambda),lambda)$. There are some special values $lambda_n$ which have a $2^n$ cycle,...

Asked on 03/25/2021

1 answer

How to dilate binary image from outside-to-inside?

I have a binary image of a line, like this one: What I'd like to do is to dilate the...

Asked on 03/25/2021 by TumbiSapichu

1 answer

Searching for elegant way manipulate complex vectors

I have some complex vectors that I would like to normalize and further manipulate. For example, one is this: ${qquad rm vec}=(-frac{-a + b + sqrt{a^2 - 2 a...

Asked on 03/25/2021

1 answer

How can I add or remove the element in the sub-lists, whose length are different?

If there are lists with different lengths of sublists like below,list1 = {{{1, 2, 3, 4}, {11, 12, 13, 14}, {22, 23, 24, 25}}, {{-1, -2, -3, -4}, {-11,-12,-13,...

Asked on 03/25/2021 by nancy

3 answer

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