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Help, please Help please

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john hollywood
john hollywood on 24 Feb 2014
Closed: MATLAB Answer Bot on 20 Aug 2021
>> 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
john hollywood
john hollywood on 24 Feb 2014
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

Answers (1)

Walter Roberson
Walter Roberson on 26 Apr 2014
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.

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