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103 views

Beginners problem, Do Loop, Eigenfunction iteration

I am trying to find the first Eigenfunction of the Laplacian (in 1D), i.e. a solution of $$u''(x)=k u(x)\\ u(0)=u(1)=0$$ with minimal $k>0$ (in this trivial example, I actually know the analytic ...
501 views

Best Mac for Mathematica [closed]

I am looking to buy a new Apple laptop or desktop for running Mathematica. What Mac is best, especially if I want to run numerical simulations in Mathematica? (A similar question was asked a few ...
256 views

How to replace the value that include infinity?

Good day, I have the output A and I want to do some operation to A: A = {0, 1, 2} B = -Total[(#*Log2[#]& /@ A] when i run, has error : ...
212 views

Taking log derivatives of data in Mathematica

We have two lists (vectors) of data, y and x, we can imagine x being time steps (0,1,2,...) and y some system property computed at each value of x. I'm interested in calculating the derivative of log ...
149 views

Any way of solving this system of nonlinear equations with non integer powers?

I have a system of four nonlinear equations. Some of the exponents are fractions. I was wondering if this is what is causing NSolve to run for hours without giving ...
323 views

Re[x] vs. x ∈ Reals in the context of Assuming

Let's say that $x$ is some real valued number $>0$. Are the following commands interchangeable in the context of using Assuming? ...
411 views

Lagrange multipliers code runs forever

I am writing a code for a Lagrange multipliers problem with three variables. My code looks like this: ...
55 views

non-intersecting cylinders and DiscretizeRegion, RegionIntersection [duplicate]

This is a sequel to my previous post. ...
61 views

Capture/Save Manipulate[Select[dataset to Usable File Format

Using the following code generates a view of exactly what I was seeking, 'manipulating' a large spreadsheet/table: ...
35 views

Wrapped Association into a “structure”: how to define Equal[] and what are the good practices for package dev?

Using a nice answer https://mathematica.stackexchange.com/a/197936/42847 I got from a previous question I define: ...
31 views

How to create a function in mathematica to solve for 'x' for later use?

I would like to create the quadratic formula in mathematica, multiplied with the identity matrix 5. How to store it for later use? I would like to be able to input a,b,c when I later call the ...