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Matrix vocabulary
Linear algebra matrix vocabulary
30
Mathematics
Not Applicable
09/24/2006

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Term
* * * *
0 * * *
0 0 * *
0 0 0 *
Definition
upper triangular matrix
Term
the product of two upper triangular matrices is
Definition
upper triangular
Term
1 * * *
0 1 * *
0 0 1 *
0 0 0 1
Definition
unit upper triangular matrix

(notation for all flash cards: * represents any number)
Term
the product of two unit upper triangular matrices is
Definition
unit upper triangular
Term
the product of an upper Hessenberg and an upper triangular matrix is
Definition
upper Hessenberg
Term
* * * *
* * * *
0 * * *
0 0 * *
Definition
upper Hessenberg matrix
Term
* 0 0 0
0 * 0 0
0 0 * 0
0 0 0 *
only the main diagonal of the matrix is nonzero
Definition
diagonal matrix
Term
If A is diagonal, the product SA does what?
Definition
scales the columns of S by the elements on the main diagonal of A
Term
If A is diagonal, the product AS does what?
Definition
scales the rows of S by the diagonal elements of A
Term
Toeplitz matrix
Definition
a matrix in which each descending diagonal from left to right is constant
a b c d
e a b c
f e a b
g f e a
Term
Draw a columnwise interpretation of a matrix times a vector.
Definition
[image]
Term
ai
Definition
The i'th column of a matrix A
Term
* * 0 0
* * * 0
0 * * *
0 0 * *
Definition
tridiagonal matrix
Term
Gaussian elimination
Definition
exchanging, multiplying, and adding rows of a matrix to each other to get a triangular matrix

(main diagonal should end up nonzero if you expect to find one solution)
Term
Gauss-Jordan process
Definition
scale and recombine rows until you have the identity matrix
Term
x - -
- - -
Definition
a11
Term
- x -
- - -
- - -
Definition
a12
Term
- - -
- - x
- - -
Definition
a23
Term
- - -
- - -
- x -
Definition
a32
Term
- - -
- - -
- x -
Definition
a32
Term
- - -
- - x
Definition
a23
Term
- - -
x - -
Definition
a21
Term
m
Definition
number of rows (height of matrix)
Term
n
Definition
number of columns (width of matrix)
Term
gamma
Definition
[image]
Term
2  
3  
1  
4  

times:

2 1 0 1
Definition
4     2     0     2
6     3     0     3
2     1     0     1
8     4     0     4
Term
Hessenberg decomposition
Definition
A = V A0 VH, where V is unitary and A0 is Hessenberg
Term
A unitary matrix and satisfies the condition that
Definition
A−1 =AH
Term
AH
Definition
conjugate transpose of A
Term
Hermitian
Definition
The hermitian transpose is another name for the conjugate transpose.
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