# All Questions

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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 ...