Concatenating 2D Array: Adding Rows | Step-by-Step Guide for Problem 1(d)"

[gfd43tg]

Homework Statement

I'm working on problem 1, specifically part (d) in the attached PDF file. I will show my code for (a) - (c) so you can see where I am coming from

Homework Equations

The Attempt at a Solution

(a)

  A1 = [1.3 5.2; 7.4 3.8; 9 2]

A1 =

    1.3000    5.2000
    7.4000    3.8000
    9.0000    2.0000

(b)

A1(2)

ans =

    7.4000

(c)

B = [1 1 1];
A3 = [A1 B']

A3 =

    1.3000    5.2000    1.0000
    7.4000    3.8000    1.0000
    9.0000    2.0000    1.0000

(d)
I don't know how to add a row into the array for any given row. I know if I wanted to add for example [0 0] to the end of the row

C = [0 0]

C =

     0     0

A4 = [A1; C]

A4 =

    1.3000    5.2000
    7.4000    3.8000
    9.0000    2.0000
         0         0

but I just need to move that [0 0] into the second row

 

[Joffan]

I think you have to use [xxx; C ; yyy] where xxx and yyy extract the relevant rows from A1.

Also the problem told you to use the zeros command, which you could put in place of making the intermediate matrix C.