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Eric Scöerg
Eric Scöerg
4:22 PM
Hi,

can anybody tell if there is a name for $A*D*A^T$, especially D = diag(d) matrix equation?
 
 
2 hours later…
Martin Sleziak
Martin Sleziak
6:00 PM
@EricScöerg Do you mean Matrix congruence?
 
Eric Scöerg
Eric Scöerg
6:34 PM
:) Thanks for the response.
@MartinSleziak No, sadly. A is not square, dimensionwise, lets assume it's (n×m)*(m×m)*(m×n)
 
Eric Scöerg
Eric Scöerg
6:55 PM
Ah. Sorry, I am on the bus with the cellphone. @MartinSleziak answer is right on point.
Thanks a lot
 
Martin Sleziak
Martin Sleziak
7:13 PM
Well, I have only seen congruence used for square matrices, so this seems to be something different.
 
 
2 hours later…
Eric Scöerg
Eric Scöerg
8:46 PM
@mar
No No. You were right. **Marix Congruence was exactly what I was searching for.**
I was only on the phone on the bus, and got confused since on the wiki-article, the notation is different from mine and phone screens are small :) Thanks
 

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