Symetric matrix ++

[NoteMe]

A symetric matrix is a matrix where the matrix A = the transposed matrix.

And other <type> of symetric matrix is where matrix = - transposed matrix...what is that called.


If I try to translate it directly to English then I get crooked/bent and so on...what is it called..

[Jacob Roman]

Correct me if I'm wrong. But isn't that Reflection Matrix? I'm not sure if the math behind it Transposes though, but making it negative sounds like reflection to me.

[Electroman]

is it the inverse matrix? not too sure here though.

[NoteMe]

is it the inverse matrix? not too sure here though.

No it is not the inverse matrix.

The inverse matrix: Two matrices A and B where AB = I and BA = I is true is called inverse of each other.

[NoteMe]

Correct me if I'm wrong. But isn't that Reflection Matrix? I'm not sure if the math behind it Transposes though, but making it negative sounds like reflection to me.

Not sure
what you mean by reflection matrix...but it doens't sounds like what I am looking for,...but I will google on that if you don't know anything more...

[NoteMe]

Doesn't look like a refelction matrix....

[Jacob Roman]

No need. I'll do a small program to check. It'll take one minute:

one minute later

Reflection wasn't it. Inverse wasn't it. I don't think Shadow would work either.

[NoteMe]

Just for reference this is a ***** symetric matrix

 0, 1, 2
-1,0,-3
-2,3, 0

If you transpose this matrix you will get:

0,-1,-2
1, 0, 3
2,-3, 0

and that is the same matrix as abow but it is - (minus) the same matrix

[NoteMe]

No need. I'll do a small program to check. It'll take one minute:

one minute later

Reflection wasn't it. Inverse wasn't it. I don't think Shadow would work either.

No it is not shadow either....

[Jacob Roman]

Well I was using DirectX to check for these. There are reflection and shadow matrices just to let you know. It's just other ways to calculate them that's all. I think what you have maybe a totally new kind of matrix operation. What would it be used for anyways?

[Jacob Roman]

If it's a matrix operation you made up, I guess we can call it InverseTranspose matrix.

[Electroman]

Antisymmetric Matrix
http://mathworld.wolfram.com/AntisymmetricMatrix.html

[NoteMe]

After hard English-Greek-Norwegian dictionary look ups on skew symetric matrices,and persymatric matrices, and positive symetric matrices, and negative symetric matrices, Paul found out that it was a antisymetric matric...thanks to JR, Manavo, HeMan, and a bit my self...

[Jacob Roman]

Interesting. But how can this apply to 3D engines? What would Antisymmetric Matrices be used for in that?

[NoteMe]

Well I was using DirectX to check for these. There are reflection and shadow matrices just to let you know. It's just other ways to calculate them that's all. I think what you have maybe a totally new kind of matrix operation. What would it be used for anyways?

It is not a matrix operation, it is the name of a special type of matrix that has some properties that has to be true. And the criteria was posted in the first post.

Thanks
ØØ

[Jacob Roman]

Just for you to translate it? Oh I know. Well when I asked on how it may apply to 3D graphics, I was curious on what they can be used for, if it's possible. If it can't really be used at all in 3D, I guess it's just another one of those mathmatical techniques that are out there.

[NoteMe]

Just for you to translate it? Oh I know. Well when I asked on how it may apply to 3D graphics, I was curious on what they can be used for, if it's possible. If it can't really be used at all in 3D, I guess it's just another one of those mathmatical techniques that are out there.

It's not a technique...it isn't "used" for anything....it is like the diffrent names of a vector. unit vector, free vector, zero vector bound vector....they are used in some way...but that is just the names of vectors that has some special condition. Like it is many matrices with names:

Identity matrix

Symetric matrix

Transposed matrix

inverse matrix

triangular matrix

quadratic matrix

diagonal matrix

[Jacob Roman]

Yeah that's what I thought. It isn't used for anything.

[NoteMe]

Yeah that's what I thought. It isn't used for anything.

True...it is not something that you would use directly, but it impossible to explain more complex consepts if the reader doesn't understand the terms, so they have to be explaind. Like identity matrix, and transpose and so on.