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Mathematica : Recent Questions and Answers (Page 195)

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

How to know, which constraint is being violated in linear programming problem?

my task is to minimize costs of dispatching various power plants in order to meet demand in a transmission grid. I solve the task as a linear programming problem with...

Asked on 01/10/2021 by Jakub Petrůj

2 answer

Why is the function `SumConvergence` not valid for simple power series

I want to find the convergence interval of function $sum_{n=1}^{infty} frac{1}{3^{n}+(-2)^{n}} frac{x^{n}}{n}$.Sum[(1/(3^n + (-2)^n))*(x^n/n), {n, 1, Infinity}]SumConvergence[(1/(3^n + (-2)^n))*(x^n/n), n]The above code can not get the convergence interval...

Asked on 01/10/2021

1 answer

How to find efficiently all positive linear dependencies between some vectors

I've got these vectorsvecs={{0,1,0,0,0,0,0,-1,0}, {1,-1,1,0,0,0,-1,1,-1}, {1,0,-1,1,0,-1,1,0,-1}, {1,0,-1,1,0,0,-1,0,1}, {1,0,0,-1,0,1,0,0,-1}, {1,0,0,-1,1,-1,1,-1,1}, {1,0,0,0,-1,0,0,1,0}, {-1,0,1,0,0,-1,1,0,-1}, {-1,0,1,0,0,0,-1,0,1}, {-1,1,-1,1,-1,1,0,0,-1}, {-1,1,-1,1,0,-1,1,-1,1}, {-1,1,0,-1,0,1,0,-1,1}, {-1,1,0,-1,1,-1,0,1,0},...

Asked on 01/09/2021

0 answer

How to enter underscripts in 12.2?

In the last version of Mathematica (12.2), some genius on Wolfram thought that is was a good idea to change the keyboard shortcut Ctrl+4, that have been there for years,...

Asked on 01/09/2021 by jjagmath

1 answer

How to generate repetitive graphs?

I need to create several graph for different values of a parameter $h$. The code is the followingpdf1[x_] = PDF[NormalDistribution[1, 1], x]pdf[x_] = PDF[NormalDistribution[0, 1], x]cdf1[x_] = CDF[NormalDistribution[1,...

Asked on 01/09/2021 by Api

4 answer

Error when using NDSolveValue. Lists are not the same shape

Please, help me with the following issue.I am solving the following system of the coupled PDEs with the following boundary conditions ...

Asked on 01/09/2021

2 answer

How can I find the domain of $x$ for which the function $g(x)geq0;$?

I have this function ($x>0$)$$f (x)=frac{sqrt{g (x)}+4 x left(x^2+1right) sin (pi x) cos ((3+pi ) x)}{x^4+2 x^2+1+left(4 x^2+left(x^2-1right)^2 cos (2 pi x)right)}$$f[x_] := (...

Asked on 01/09/2021 by user73597

1 answer

PeriodicBoundaryConditions: missing points (a simpler example)

EDIT: I reported this to Mathematica support. Will update later. I just posted on this issue, but I found a more elementary example which I think will make...

Asked on 01/09/2021 by Will.Mo

1 answer

How to avoid machine underflow for plotting and integrating?

I am trying to integrate the following integrand, which I have plotted:Manipulate[ Plot[1/k Evaluate@ D[Erfc[k] + PolyLog[0, -E^(-(k - [Mu])/T)] + ...

Asked on 01/09/2021 by WillG

0 answer

How do I construct a matrix using table command. I can not form it's function

I have to form a matrix like this. How ever I can not directly input. I have to form a function and then use the table command. I am stuck....

Asked on 01/09/2021 by Tarandeep Kaur

2 answer

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