2.14.1 Top new questions this week

2.14.1.1 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

2.14.1.2 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

2.14.1.3 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

2.14.1.4 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

2.14.1.5 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

2.14.1.6 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

2.14.1.7 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