12.5.2 Greatest hits from previous weeks

12.5.2.1 Calculating the normalization constant for a wavefunction
12.5.2.2 Plot data from txt file?
12.5.2.3 How to add a front-end to the free Wolfram Engine?
12.5.2.4 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 $W$
12.5.2.5 Why should I avoid the For loop in Mathematica?
12.5.2.6 What is the difference between Reduce and Solve?
12.5.2.7 Figuring when the minute and hour hand coincide on a clock
12.5.2.1 Calculating the normalization constant for a wavefunction

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=99248

How can I compute the normalization constant for a quantum mechanics wave-function, like $\Psi(x) = N \exp(-\lambda x^2/2)$ by using Mathematica? (The normalization constant is $N$). 
[physics]
 
asked by infiniteNOP https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=35524 Score of 2
answered by Jason B. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9490 Score of 5
12.5.2.2 Plot data from txt file?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=5910

I have data in file.txt which can be expressed by 20000x11 matrix. I do not want to import all of these data. How can I plot graph of the column 1 & column 4? 
[plotting] [import]
 
asked by Gokce https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1297 Score of 21
answered by user1066 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=106 Score of 25
12.5.2.3 How to add a front-end to the free Wolfram Engine?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=198839

https://blog.stephenwolfram.com/2019/05/launching-today-free-wolfram-engine-for-developers/ 
 
http://www.wolfram.com/engine/ 
 
The Free Wolfram Engine for Developers is available for pre-production ... 
[front-end] [free-wolfram-engine] [jupyter-notebook]
 
asked by Alexey Golyshev https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=23402 Score of 88
answered by Alexey Golyshev https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=23402 Score of 70
12.5.2.4 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
12.5.2.5 Why should I avoid the For loop in Mathematica?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=134609

Some people advise against the use of  For  loops in Mathematica. Why?  Should I heed this advice?  What is wrong with  For ?  What ... 
[core-language] [coding-style] [faq]
 
asked by Szabolcs https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 Score of 120
answered by Szabolcs https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 Score of 128
12.5.2.6 What is the difference between Reduce and Solve?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=17127

 Solve  and  Reduce  both can be used for solving equations. 
 
Just by working with them, I know there are some differences between ... 
[equation-solving] [functions] [function-comparison]
 
asked by lachis83 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2371 Score of 117
answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 111
12.5.2.7 Figuring when the minute and hour hand coincide on a clock

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=573

I would like to list all possible times in a 12-hour period, where the hour hand overlaps the minute hand completely.  This is really a question about three distinct things - to be done in Mathematica ... 
[equation-solving]
 
asked by Steve D https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=191 Score of 16
answered by Verbeia https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=8 Score of 22