Table of Contents

## What is column space in a matrix?

A column space (or range) of matrix X is the space that is spanned by X’s columns. Likewise, a row space is spanned by X’s rows. Every point on the grid is a linear combination of two vectors.

**What is the product rule of matrix?**

The product of two matrices will be defined if the number of columns in the first matrix is equal to the number of rows in the second matrix. If the product is defined, the resulting matrix will have the same number of rows as the first matrix and the same number of columns as the second matrix.

**What is the basis of column space?**

A basis for the column space of a matrix A is the columns of A corresponding to columns of rref(A) that contain leading ones. The solution to Ax = 0 (which can be easily obtained from rref(A) by augmenting it with a column of zeros) will be an arbitrary linear combination of vectors.

### What is the basis for column space?

**Why do we multiply matrices row by column?**

Why? Because every element is determined by the rows in the first matrix and columns in the second matrix. Shows which rows and columns will be combined to calculate a specific cell in the result matrix.

**Is null space and column space same?**

The column space of an m × n matrix A is all of Rm if and only if the equation Ax = b has a solution for each b in Rm. (a) The column space of A is a subspace of Rk where k = . (b) The null space of A is a subspace of Rk where k = . (c) Find a nonzero vector in Col A.

## What is the product of two matrices?

The product of two matrices can be computed by multiplying elements of the first row of the first matrix with the first column of the second matrix then, add all the product of elements. Continue this process until each row of the first matrix is multiplied with each column of the second matrix.

**What is the column space of the zero matrix?**

The column space of A consists of all linear combinations of the columns of A. In particular, each column of A is an element of C(A). Hence, if C(A) contains only the zero vector, then each column of A must be the zero vector, meaning that A is the zero matrix.

**What is the basis of a column space?**