Concepts Flashcards
1
Q
Column vector
A
a
b
c
2
Q
row vector
A
a, b, c
3
Q
matrix element
A
aij
i row
j column
4
Q
the diagonal of a matrix
A
aij
i=j
5
Q
kM
scalar
A
ka, kb
kc, kd
6
Q
add/minus need same dimension?
A
yes
7
Q
C=AB
A
cij = k1->n aik bkj
8
Q
multiplication [abstract sensation]
A
tilt -> drop
first top magnet
9
Q
special matrix:
0
zero matrix
A
0 0
0 0
10
Q
special matrix:
I
identity matrix
A
1 0 0
0 1 0
0 0 1
11
Q
special matrix:
D
diagonal matrix
A
d1 0 0
0 d2 0
0 0 d3
12
Q
special matrix:
B
band/banded matrix
A
d1 a1 0
b1 d2 a2
0 b2 d3
13
Q
special matrix:
U
upper matrix
A
a b c
0 d e
0 0 f
14
Q
special matrix:
L
lower matrix
A
a 0 0
b c 0
d e f
15
Q
what is transpose?
A
diagonal flip
aij -> aji
mxn -> nxm
