8.30.1 Top new questions this week

8.30.1.1 Flip the bits on the diagonal of a binary matrix
8.30.1.2 Mark all Points in a triangle that have a certain property
8.30.1.3 Controlling point in graphics 3D with locator
8.30.1.4 Add a button in Manipulate to execute a bookmark animation?
8.30.1.5 Quaternionic Kronecker Product
8.30.1.6 Available Methods for DSolve?
8.30.1.7 How to write a condition for FindMinimum correctly
8.30.1.1 Flip the bits on the diagonal of a binary matrix

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=273404

The following code flips the bits of a binary-valued matrix. 
I realise that the positions of diagonal elements (form {i,i}) can be easily generated with Table or another Mathematica function. I don't ... 
[list-manipulation] [matrix]
 
asked by Michel https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=62210 Score of 10
answered by Lukas Lang https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36508 Score of 7
8.30.1.2 Mark all Points in a triangle that have a certain property

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=273228

I want to mark all points inside of a triangle having the following property: 
I can center a line segment of length $c$ on the point so that the line segment is entirely contained inside the triangle. 
... 
[plotting] [computational-geometry]
 
asked by Jannik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61034 Score of 10
answered by cvgmt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72111 Score of 13
8.30.1.3 Controlling point in graphics 3D with locator

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=273381

I want to control a point in 3D graph by dragging it with the mouse 
lets say this is my code and I want to add some functionality like the way locator works in 2d graphics 
... 
[graphics] [graphics3d] [scripting]
 
asked by Tt Tt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=87952 Score of 8
answered by wmora2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=40277 Score of 9
8.30.1.4 Add a button in Manipulate to execute a bookmark animation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=273312

I am writing a Manipulate with a set of bookmark animations.   Below is a simple toy example.  However, rather than having to select the "+" icon and select the "Animate bookmarks" ... 
[manipulate] [animation]
 
asked by josh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81539 Score of 8
answered by Lukas Lang https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36508 Score of 4
8.30.1.5 Quaternionic Kronecker Product

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=273295

I want to define the Kronecker product of quaternionic matrices. 
I want to follow the idea of this answer of passing the  NonCommutativeMultiply  to the matrix ... 
[matrix] [quaternions]
 
asked by Jan Hajer https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=18862 Score of 8
answered by MarcoB https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=27951 Score of 7
8.30.1.6 Available Methods for DSolve?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=273237

I would like to know, apart from  Method->Automatic  what are available methods for  DSolve . 
... 
[differential-equations] [symbolic] [undocumented]
 
asked by drgrujic https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13928 Score of 8
answered by Michael E2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4999 Score of 6
8.30.1.7 How to write a condition for FindMinimum correctly

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=273328

I would like that, when finding the minimum, the FindMinimum analyzes the variables (x and y) each time and finds q, depending on the current values of x and y. Can I somehow write this condition into ... 
[mathematical-optimization] [conditional]
 
asked by Mam Mam https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=88159 Score of 7
answered by b.gates.you.know.what https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=134 Score of 7