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Mathematica : Recent Questions and Answers (Page 44)

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

Determinant of Gauss (Area of a polygon of n vertices) how to implement

A very useful procedure to find the area of ​​any irregular polygon is through the Gauss determinant. It involves drawing the figure on a Cartesian plane, setting the coordinates of...

Asked on 08/01/2021

1 answer

Making boundary condition a variable in ParametricNDSolve

I would like to make where my ODE is evaluated at (not the boundary condition itself but rather the "x" value of the boundary condition) to be a variable in...

Asked on 07/31/2021

1 answer

Prevent Full-Screen on Presentation Start

Because my presentation will be given remotely, and I will go in and out of presentation mode often while engaging with the audience, I do not want Mathematica to go...

Asked on 07/31/2021

0 answer

WolframScript not simplifying output

I'm trying to multiply a matrix and a vector (imported from a csv) in Wolframscript to speed up a process normally done with Mathematica notebooks. This is my first time...

Asked on 07/31/2021 by CharlotteC

1 answer

How can I check if one expression implies another?

Say I have one expression, for example $x^3-3 + c = y$, and I want to check if it implies another with some set of explicitly stated assumptions. With...

Asked on 07/31/2021 by user12404

2 answer

sorting out the coordinate and respective solution values for plotting

I want to plot for coordinates and corresponding solution values below. coor = {0.,6000., 2000., 4000., 8000., 10000., 6000., 12000., 8000., 10000.} ϕvalue = {{1.}, {0.178533}, {1.0287}, {0.709987}, {},...

Asked on 07/31/2021

1 answer

How to understand the usage of Inner and Outer figuratively?

Description:In Mathematica the functions like Thread, Inner, Outer etc. are very important and are used frequently. For the function Thread: Thread Usage1:Thread[f[{a, b, c}]]{f[a], f[b], f[c]}Thread Usage2:Thread[f[{a,...

Asked on 07/30/2021 by xyz

5 answer

Nested lamdas: MapThreading a MapAt lambda

Consider a set of (here) 3 seriesr`data = Thread[{Range@4, # Range@4}] & /@ (10 Range@3);(*{{{1, 10}, {2, 20}, {3, 30}, {4, 40}}, {{1, 20}, {2, 40}, {3, 60}, {4,...

Asked on 07/30/2021

3 answer

Form sub-equations from a parent equation

I have 2 coupled differential equations which I want to solve using Galerkin Method. As such, I want to substitute the dependent variables as a polynomial expansion of the independent...

Asked on 07/30/2021 by user75147

0 answer

Expressing a polynomial as a sum of squares

I encountered a degree 4 polynomial in 8 variables f(a1,a2,a3,a4,b1,b2,b3,b4) that I suspect can be written as a sum of squares. While sostools in MATLAB would find...

Asked on 07/30/2021 by pizzazz

2 answer

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