Matrices Flashcards
1
Q
what is a matrix?
A
.an array of numbers that are arranged in rows and columns
2
Q
m X n matrix, m-by-n matrix means?
A
a matrix with m rows and n columns
3
Q
empty matrix
A
matrix with no entries
4
Q
row vector
A
matrix with a single row
5
Q
column vector
A
matrix with a single column
6
Q
square matrix
A
matrix with the same number of rows and columns
7
Q
what is an identity matrix?
A
the identity matrix of size n is the n × n square matrix with ones on the main diagonal and zeros elsewhere
8
Q
what is scalar multiplication?
A
Scalar multiplication is the multiplication of a vector by a scalar (where the product is a vector), and is to be distinguished from inner product of two vectors (where the product is a scalar)
