Question

what is span row and span column​

Answer 1

Answer:

Step 1. Obtain the square matrix, say A

Step 2. Write A = In A

Step 3. Perform the sequence of elementary row operations on A on the LHS and the pre-factor In on the RHS till we obtain the result In = BA

Step 4. Write A-1 = B

Here is an example to find the inverse of the given matrix, using the elementary row operations

Find the inverse of the matrix.

Solution:

Let

Now, A = IA

∴

Column Operation:

To perform an elementary column operation on A, an r x c matrix, take the following steps.

To find E, the elementary column operator, apply the operation to an c x c identity matrix.

To carry out the elementary column operation, postmultiply A by E.

Let's work through an elementary column operation to illustrate the process. For example, suppose we want to interchange the first and second columns of A, a 3 x 2 matrix. To create the elementary column operator E, we interchange the first and second columns of the identity matrix I2 .

1 0

0 1 ⇒

0 1

1 0

I2 E

Then, to interchange the first and second columns of A, we postmultiply A by E, as shown below.

C1 <--> C2 =

0 1

2 3

4 5

0 1

1 0 =

0*0 + 1*1 0*1 + 1*0

2*0 + 3*1 2*1 + 3*0

4*0 + 5*1 4*1 + 5*0 =

1 0

3 2

5 4

A E

Answer 2

Explanation:

The rowspan and colspan are <td> tag attributes. These are used to specify the number of rows or columns a cell should span. The rowspan attribute is for rows as well as the colspan attribute is for columns. These attributes have numeric values, for example, colspan=3 will span three columns.