Question

Which among the following can always represent a vector?

• A. A diagonal matrix
• B. an Identity matrix
• C. a scalar matrix
• D. a row matrix

Answer 1

The correct option is D

a row matrix

A row matrix is of the order 1 x n where n can be any natural number. If you consider a vector for example $3\hat{i}+4\hat{j}+5\hat{k}$, it can be represented as [3 4 5] which at essentially is a row matrix. In this case the order of the resulting row matrix is $1\times 3$.