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Mathematica : Recent Questions and Answers (Page 71)

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

Making histogram from a vector

I am looking for a nice way to turn a vector-valued function into a set of histograms. I have a function $$f(t) = (a(t), b(t), c(t), d(t))$$ and would...

Asked on 06/24/2021 by PhysMath

1 answer

Table Glitch / Error with binary data

I have a large group of binary files that I am loading withbinaryList = Table[ BinaryReadList[ paths[[i]], "Byte"], {i, Length@paths}];specifically 1019 files that are 4.5 mb each. I...

Asked on 06/23/2021 by atlasgeo

0 answer

Separating list with nested sublists of different lengths

Consider the following list, with sublists of different lengthslist = {{{0.8, 0.8, 0.8}}, {{1, 1, 1}, {4, 1, 1}, {3, 3, 2}}, {{1.2, 1.2,...

Asked on 06/23/2021

1 answer

The fastest way of raising indices of high rank tensor

I have some high dimensional high rank tensors, let's say $$F_{ijkl}$$ and I need to find $$F^{abcd}=g^{ai}g^{bj}g^{ck}g^{dl}F_{ijkl}.$$Here $g^{ij}$ is the contravariant metric. Simple summation in Mathematica takes way to...

Asked on 06/23/2021

2 answer

How to set a background color for a cell style via a command?

I want to set different background colors for various cell styles (e.g. Section, Text), so that whenever I choose a specific style for some cell in the notebook, it automatically...

Asked on 06/23/2021 by AMA

2 answer

Is there a Mathematica CUDA ode solver?

I have a system of ODEs which I'd like to solve with many (thousands) different initial conditions. In the net there are articles that CUDA can speed up such computations,...

Asked on 06/23/2021

0 answer

Search in a Dataset

I'm new to mathematica and I'm struggling to search for a value in a dataset. I have a dataset consisting of pairs of two values.The import led to: name...

Asked on 06/22/2021 by André Paschold

0 answer

How can I reduce the error estimate of numerical integration in Mathematica?

Before introducing the integral I want to go through some definitions. Define triangles $T_1$ and $T_2$ by the points ${a,b,c}$ and ${d,e,f}$ respectively. Define $$D(u,v,x,y)...

Asked on 06/22/2021 by Pedro Morales

1 answer

Testing equivalence of analytical expressions like $x^2 -x == x(x-1)$

On occasion I have two expressions that I may be equal but simplified differently, and I want to check if they are actually equivalent. Using the equation in the...

Asked on 06/22/2021

2 answer

how to construct a fancy bar chart

I have the following code to produce an almost fancy BarChart:countries = CountryData["G7"];data = {{2, 1, 1.5, 3, 3, 2.5, 4}, {-2, -1, -1.5, -3, -3, -2.5, -2}};BarChart[data, PlotLabel...

Asked on 06/22/2021

1 answer

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