Greatest hits from previous weeks

11.38.2 Greatest hits from previous weeks

11.38.2.1 How do I get the inverse of a homogeneous transformation matrix?
11.38.2.2 Even Fibonacci numbers
11.38.2.3 Positioning axes labels
11.38.2.4 How to find the position of elements in a list satisfying criteria
11.38.2.5 Where can I find examples of good Mathematica programming practice?
11.38.2.6

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 $W$

11.38.2.7 Principal submatrix and Principal minor of a matrix

11.38.2.1 `How do I get the inverse of a homogeneous transformation matrix?`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=106257

I want to get the inverse of this homogeneous transformation matrix: 
 
 iab = { 
{1, 0, 0, 0}, 
{0, 0, -1, 0}, 
{0, 1, 0, 3}, 
{0, 0, 0, 1} 
} 
 
 
using the ... 
[matrix] [linear-algebra] [inverse] [geometric-transform] [rotation]

asked by andrestoga https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=37677 Score of 7

answered by march https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=29734 Score of 15

11.38.2.2 `Even Fibonacci numbers`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=37266

Today, I found the Euler Project. Problem #2 is 
 
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 
... 
[number-theory] [project-euler]

asked by xyz https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9627 Score of 34

answered by rcollyer https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=52 Score of 47

11.38.2.3 `Positioning axes labels`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=87388

I need to change the position of my axes labels such that the y-axis label is in the middle and parallel to the y-axis. I'd also like the x-axis label to be in the middle of the x-axis rather than ... 
[plotting] [graphics]

asked by John_dydx https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7849 Score of 19

answered by Virgil https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=27697 Score of 20

11.38.2.4 `How to find the position of elements in a list satisfying criteria`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=180

Say I have a list  x={2,4,6,8,10}  and I want to find out the positions of the elements that are greater than 7. 
 
... 
[list-manipulation]

asked by PeterR https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=140 Score of 76

answered by J. M.'s missing motivation https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 Score of 82

11.38.2.5 `Where can I find examples of good Mathematica programming practice?`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=18

I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't ... 
[reference-request] [programming]

asked by J. M.'s missing motivation https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 Score of 608

answered by faysou https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=66 Score of 532

11.38.2.6 `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) 
 
... 
[equation-solving] [functions] [approximation]

asked by J.D'Almbert https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19257 Score of 7

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

11.38.2.7 `Principal submatrix and Principal minor of a matrix`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=154018

A submatrix of a matrix is obtained by deleting any collection of rows and/or columns. 
 
For example, from the following 3-by-4 matrix, we can construct a 2-by-3 submatrix by removing row 3 and column ... 
[list-manipulation] [matrix] [programming] [linear-algebra]

asked by Emad kareem https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=44458 Score of 10

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

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11.38.2 Greatest hits from previous weeks

11.38.2.1 How do I get the inverse of a homogeneous transformation matrix?

11.38.2.2 Even Fibonacci numbers

11.38.2.3 Positioning axes labels

11.38.2.4 How to find the position of elements in a list satisfying criteria

11.38.2.5 Where can I find examples of good Mathematica programming practice?

11.38.2.6 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 $W$

11.38.2.7 Principal submatrix and Principal minor of a matrix

11.38.2.1 `How do I get the inverse of a homogeneous transformation matrix?`

11.38.2.2 `Even Fibonacci numbers`

11.38.2.3 `Positioning axes labels`

11.38.2.4 `How to find the position of elements in a list satisfying criteria`

11.38.2.5 `Where can I find examples of good Mathematica programming practice?`

11.38.2.6 `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 $W$`

11.38.2.7 `Principal submatrix and Principal minor of a matrix`