Help, please Help please

>> A=[1 2;3 4];
>> B=[9 8 7;6 5 4;3 2 1]; 
>> a=[11,12];
>> b=[21;22];
>> c=[19 18 17]; 
>> d=[29;28;27];

i am stuck on these questions , i did the rest but really stuck on these question , i spend almost 4 hours playing around with different ways, but can't get the right answer. any help will be much appreciated. Thank you soo much

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

[john hollywood]

i apologize for that sir ,it won't happen again.

[john hollywood]

for 'part F' i just don't how put number "29" in there. also for 'Part G', i just don't know how to put matrix A in that diagonal form.i did try switch rows and columns and also tried transpos but nothing seems to work. i used diag(diag(A')) But its not working. Thank you soo much

Answer 1

[Walter Roberson]

Part F:

[A./A, a.', b; c, d(diff(a))]

It is foolish to have to synthesize the 1's by using something like A divided by A.

Part G:

[diag(A(diff(a),:)), diag(diag(A./A)); A./A, A-A]

Pretty silly too.