2.14 Thursday, September 10, 2020

2.14.1 Top new questions this week

Can we use Mathematica to design an electronic active filter?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229714

How can we use Mathematica to design an electronic implementation of an active filter?

asked by David Keith https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=44700 19 votes

answered by David Keith https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=44700 22 votes

How to mesh a French biscuit (modulated ellipsoid)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229535

I would like to create a boundary mesh of the following ellipsoid, whose thickness is modulated along its long axis:

The surface parametrization I used for it is:

asked by Oscillon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13605 10 votes

answered by Michael E2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4999 10 votes

Solutions for searching over Mathematica notebooks?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229522

I have hundreds of Mathematica notebooks accumulated over the years, and I’d like to search over them. I’ve been using various versions of text search (grep, SilverSearcher, Spotlight), but there are ...

asked by Yaroslav Bulatov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=217 10 votes

answered by Chris Degnen https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=363 11 votes

Coordinate-free derivative

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229703

Given the function \[f:v\mapsto \dfrac {v}{\|v\|},\] I would like to compute the derivative of \(f\), that is \(df(v)\). It is possible to derive it by hand, which leads to

asked by anderstood https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=18767 9 votes

Please explain this syntax: GaborWavelet[6]["FourierFactor"]

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229853

I’ve been using Mathematica for some years, yet I’m befuddled by this statement: GaborWavelet[6]["FourierFactor"]

It appears to give the center frequency ...

asked by Chris https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=66733 7 votes

answered by Carl Woll https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=45431 11 votes

How to select several columns from a dataset

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229678

I have a dataset with 20 columns. For a analysis I need all columns except the columns 9 and 11. What I do is:

asked by Michiel van Mens https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9590 7 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 9 votes

BarLegend ticks distorted in MatrixPlot

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229502

As shown in many threads here (this, this, ...), Ticks is a valid option of BarLegend.

But it doesn’t seem to work well in this ...

asked by xiaohuamao https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=11125 7 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 8 votes

2.14.2 Greatest hits from previous weeks

Help find a bright object on Mars!

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=11819

In today’s news, scientists found a bright object on one of Curiosity’s photos (it’s near the bottom of the picture below). It’s a bit tricky to find - I actually spent quite some time staring at the ...

asked by Victor K. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1351 198 votes

answered by Niki Estner https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=242 257 votes

Extract real part of a complex expression better than Re does

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=3306

I have a complex expression with real positive variables only.

Mathematica Input Style:

asked by max https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=796 33 votes

answered by nixeagle https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=814 52 votes

Solving \(L=\frac {3}{2} \sqrt {4 \pi ^2 A^2+W^2}-\frac {\sqrt {5 W \sqrt {4 \pi ^2 A^2+W^2}+6 \pi ^2 A^2+3 W^2}}{\sqrt {2}}+\frac {3 W}{2}\) for \(W\)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=57763

When I solve the aforementioned equation for \(W\) or \(A\) on Mathematica I get a long and ugly equation in return, namely one of the solutions for \(W\) is: (attempt to read at your own health)

asked by J.D’Almbert https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19257 8 votes

answered by Alexei Boulbitch https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=788 15 votes

How to ask Mathematica to imitate Andy Warhol’s pop-art painting?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=59132

I tried to ask Mathematica to imitate Andy Warhol, let it convert a Marilyn Monroe’s portrait so that it looks like Warhol’s world famous pop-art painting.

However, the result shown below is far from ...

asked by Putterboy https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=16069 50 votes

answered by Dr. belisarius https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=193 65 votes

Cutting bagels into linked halves

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=7545

I recently came across this video: Mathematically correct breakfast, which shows how a bagel can be neatly sliced into two identical linked halves. I’d like to try this with Mathematica. Here’s a ...

asked by rm -rf https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5 62 votes

answered by Heike https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46 76 votes

How to generate a random snowflake

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=39361

’Tis the season... And it’s about time I posed my first question on Mathematica Stack Exchange. So, here’s an holiday quest for you Graphics (and P-Chem?) gurus.

What is your best code for generating ...

asked by Peltio https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=6745 140 votes

answered by Silvia https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=17 181 votes

Finding unit tangent, normal, and binormal vectors for a given r(t)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=18598

For my Calc III class, I need to find \(T(t), N(t)\), and \(B(t)\) for \(t=1, 2\), and \(-1\), given \(r(t)=\{t,t^2,t^3\}\).

I’ve got Mathematica, but I’ve never used it before and I’m not sure how to coerce ...

asked by a98 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5605 30 votes

2.14.3 Can you answer these questions?

Solving equations over unknown Domains

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229778

I am trying to solve for what values of some variables make some expressions true; not exactly equations. For a toy example, I am trying to solve for all values of \(x\) that make \(4x\) an Integer.

asked by Matthew Crawford https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=51196 1 vote

Not able to globalize variables from a manipulate expression

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229534

I am attempting to globalize the variables inside of a Manipulate expression for which my variables are also using interdependent controls. I have attempted to use

asked by Ryan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=74490 1 vote

force maximum simplification of radicals in a traditional way-How to do it?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=229660

this should be simple but I can’t get mathematica to simplify a radical or a set of radicals and express them in the traditional way for example by simplifying this

asked by BeTDa https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72885 2 votes

answered by Daniel Huber https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46318 0 votes