9.13.1 Top new questions this week

9.13.1.1 Ordering of index pairs
9.13.1.2 Can I tell DeleteCases not to delete function arguments?
9.13.1.3 Replacing 2D Patterns in 2D Lists   Markov Programming Language
9.13.1.4 Efficient way to compose a SparseArray from system of linear equations
9.13.1.5 Making whole plot transparent
9.13.1.6 Solve computes discontinuous eigenvalues of parameter-dependent matrix
9.13.1.7 How to rewrite numbers written in the string type to the numbers?
9.13.1.1 Ordering of index pairs

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283427

In a list of index-pairs every index occurs twice 
... 
[list-manipulation]
 
asked by Ulrich Neumann https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53677 Score of 11
answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 11
9.13.1.2 Can I tell DeleteCases not to delete function arguments?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283496

Given  list = {1, 2, f[3, 4], {5, {6, g[7, h[8, 9]]}}, {f[10], 11}}; 
I want to get 
 {f[3, 4], {{g[7, h[8, 9]]}}, {f[10]}} 
just ... 
[pattern-matching] [filtering]
 
asked by expression https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7339 Score of 7
answered by xzczd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1871 Score of 6
9.13.1.3 Replacing 2D Patterns in 2D Lists   Markov Programming Language

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283355

Recently I came across with a probabilistic programming language where programs are combinations of rewrite rules - Markov Junior 
I think it is quite interesting to try out implementing some features ... 
[list-manipulation] [replacement] [pattern-matching] [markov-process]
 
asked by Kirill Vasin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53728 Score of 6
answered by Kirill Vasin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53728 Score of 5
9.13.1.4 Efficient way to compose a SparseArray from system of linear equations

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283588

I have several relations between some variables, e.g.  id[1] - id[2] = 0, id[2] = 0 . I need to compose a SparseArray that contains the coefficients. In that example,<... 
[list-manipulation] [sparse-arrays]
 
asked by Albercoc https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72141 Score of 6
answered by Ben Izd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=77079 Score of 8
9.13.1.5 Making whole plot transparent

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283515

Is it possible to make a whole plot (including axes etc) transparent using a simple command? 
To compare some figures I want to be able to quickly show plots over each other with one or multiple of ... 
[plotting] [opacity]
 
asked by Kvothe https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=45020 Score of 6
answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 9
9.13.1.6 Solve computes discontinuous eigenvalues of parameter-dependent matrix

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283401

So I have a family of unitary matrices $m(x,y)$, which depend on two parameters $x,y \in [0, 2 \pi)$. Its eigenvalues should be continuous in $(x,y)$. Since $m(x,y)$ is a unitary matrix, its ... 
[equation-solving] [eigenvalues] [discontinuity] [parameters]
 
asked by Andreas132 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=92215 Score of 6
answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 7
9.13.1.7 How to rewrite numbers written in the string type to the numbers?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283542

I have a list with string type characters: 
... 
[list-manipulation] [matrix] [mathematical-optimization] [numerics] [string-manipulation]
 
asked by Mam Mam https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=88159 Score of 5
answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 9