Mathematica Questions, Problems & Solutions : TransWikia.com ~ Page 142

How to extract a column (or a row) of a matrix as another column vector/ column matrix (or a row vector), not as a list?

Suppose I have a matrix 'mat' asmat = Table[Subscript[m, i, j], {i, 5}, {j, 5}];mat // MatrixFormI want to extract the first column (or any row) asa =...

Asked on 03/19/2021 by PoreyS

2 answer

Storing results of a calculation as a list

Clear[Pressure, EnergyDensity, fromPressureToEnergy, fromEnergyToPressure, Ae, Be, Ap, Bp, Er, Mr, Pr, r, h, g1, f1, k1, m1, f2, g2, k2, m2, f3, g3, k3, m3,...

Asked on 03/19/2021 by Davood Rafiei

0 answer

Contour plot of greatest real root of an equation y^4=f(a,b)

Can anyone tell me where I am going wrong? The output is blank. I am trying to contour plot the positive real value of (f(sigma, alpha1))^(1/4) in terms of variables...

Asked on 03/19/2021 by S Das

1 answer

Numerical verification of the estimate:

How to verify numerically with considerable accuracy in Mathematica the following :$$int_2^xdfrac{1}{zGamma(sin^2[πGamma(z)/(2z)])}dzsimln(ln(x))$$? I need more suitable and better code for it as you can see integrand oscillates wildly. Any...

Asked on 03/19/2021

0 answer

Extracting city names in the text form from the function CountryData

I was planning to create an array with all capital cities in Europe using the following command: CountryData["Europe", "CapitalCity"] But unfortunately, it returns all results in rectangular frames. How can...

Asked on 03/19/2021 by Camillus

2 answer

First elements in sublists

Givent1 = {{{1, 2, 3, 4}, {5, 6, {15, 16}, 7}}, {11, 12, 13, 14}};I try to get First elements from sublists which would yield{1,5,15,11}How to use First,...

Asked on 03/19/2021

4 answer

NDSolve is finding a stiff system very quickly trying to solve a large set of differential equations

I'm a physics PhD student solving lubrication equations (non-linear PDEs) related to the evaporation of binary droplets in a cylindrical pixel in order to simulate the shape evolution. So I...

Asked on 03/19/2021 by Seth Price

0 answer

How to add an attractive potential (migration term) named component to Mass Transport PDE

Wolfram Mathematica 12.2 now features "Named Partial Differential Equation Terms"For specific physics fields, relevant PDE terms have been packaged ascomponents and augmented with boundary condition functions...

Asked on 03/18/2021 by rhermans

2 answer

How to get capital letter with graphic accent? E.g. when I type Á I get á

When I type in a text cell the word ANÁLISE I get in the screen ANáLISE. This occur in every word with ' ~ ^ . This problem just occur...

Asked on 03/18/2021 by Daniel Rocha da Silva

0 answer

Plot3D with coloring based on phase value of f

I'm reading a sample chapter of Visual Complex Functions by E. Wegert. Near the bottom of this page, there is a link "Download Sample pages 1 (pdf,...

Asked on 03/18/2021

2 answer

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