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I have to create a matrix using only zeros, ones and eye

Asked by sarah beituni on 21 Jan 2019
Latest activity Commented on by Kevin Phung on 21 Jan 2019
This is the matrix:
1 1 1 1 1
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1
so far I wrote B=ones(1,5); C=eye(4,5); A=[B;C]
But this command didn't come out right. Can someone please help me.

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2 Answers

Answer by Kevin Phung on 21 Jan 2019
Edited by Kevin Phung on 21 Jan 2019
 Accepted Answer

your command A = [B;C] concatenated them vertically.
Try:
C = eye(5)
C(1,:) = 1; % turns every element along the first row to 1.

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>> C = eye(5);
>> C(1,:) = 1
C =
1 1 1 1 1
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1
I would like to clarify that I made the exact same changes right before I saw your comment!
Originally I had something like
C(1,:) = B;

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Answer by Rob Purser on 21 Jan 2019

A = eye(5);
A(1,:) = ones(1,5);

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