Left matrix division

12162018, 10:45 AM
Post: #1




Left matrix division
Is there a shortcut for left matrix division, similar to the Matlab backslash (\) symbol
(or can this symbol be considered for a future enhancement)? Dale 

12162018, 09:44 PM
Post: #2




RE: Left matrix division
Matlab A*x = B → x = A\B
HP Prime A*x = B → x = B/A Viga C  TD  FB 

12172018, 01:49 PM
Post: #3




RE: Left matrix division
(12162018 09:44 PM)Carlos295pz Wrote: Matlab A*x = B → x = A\B Matrix multiplication is noncommutative, so you can't just reverse the positions of A and B like that. For square matrices A and B (of the same size), Matlab's A\B is roughly equivalent to A⁻¹B, and A/B is roughly equivalent to AB⁻¹ (like on HP Prime), although Matlab supports left and right division of nonsquare matrices too. — Ian Abbott 

12172018, 01:54 PM
(This post was last modified: 12172018 01:56 PM by compsystems.)
Post: #4




RE: Left matrix division
can use the \ symbol (next firmware) for other functions, such as integer division, set
difference 5\4 [↵] 1 \ Synonym of minus infix operator set[ "b", "a", "c", "a" ] minus set[ "a", "d" ] [↵] set["b","c"] set[ "b", "a", "c", "a" ] \ set[ "a", "d" ] [↵] set["b","c"] SBASIC > https://smallbasicpublicwebsite.azurewebsites.net/ 

12172018, 04:11 PM
Post: #5




RE: Left matrix division
(12172018 01:49 PM)ijabbott Wrote:(12162018 09:44 PM)Carlos295pz Wrote: Matlab A*x = B → x = A\B I was trying to inspire enthusiasm for the use of the backslash symbol as a short hand for this purpose. While not directly on a key face, it is available via the [Chars] menu. My track record for successful suggestions, hasn't been very productive, so I doubt this will be any different, but, with enough merit, and interest, one never knows! 

12172018, 10:10 PM
Post: #6




RE: Left matrix division
(12172018 01:49 PM)ijabbott Wrote: Matrix multiplication is noncommutative, so you can't just reverse the positions of A and B like that. It is the evolution of mathematics xD Viga C  TD  FB 

12182018, 06:37 PM
Post: #7




RE: Left matrix division
set of algorithm talking about backslash: Tim Davis
https://www.youtube.com/watch?v=5NpBTUSQac4 

12182018, 07:53 PM
Post: #8




RE: Left matrix division
(12172018 10:10 PM)Carlos295pz Wrote: ...It is the evolution of mathematics xDIt is not evolution computationally we can overload the operators, for example *, can mean dot product between vectors, Cartesian product, but mathematically affects the definitions SBASIC > https://smallbasicpublicwebsite.azurewebsites.net/ 

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