matrices Flashcards
1
Q
what is a matrix?
A
a collection of elements which contain both rows and columns and are written inside brackets
2
Q
how do we determine the order (size) of a matrix?
A
number of rows x number of columns
3
Q
order of
(1,0,0)
A
1x3
4
Q
what is an identity?
A
a value that doesn’t change another value after an operation
5
Q
what is the additive identity of a matrix
A
(00)
(00)
6
Q
what is the symbol for an identity matrix
A
I
7
Q
what is the identity matrix I
A
a square matrix which has 1’s in the ‘leading diagonal’ (starting at top left) and 0 elsewhere
8
Q
true/false:
any matrix multiplied by the identity matrix won’t change
A
true
