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Append rows at the end of Matrix

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Trushit
Trushit ，2014-1-27
编辑： user924 ，2021-1-26
Hi,
a = [1 2 3 ; 4 5 6; 7 8 9]; --> 3x3 matrix
I want to insert at the end number of raws with same elements such as [5 5 5] and make the matrix 10 x 3 i.e. I want to insert 7 more raws with [5 5 5]. Please explain.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-1-27
编辑：Azzi Abdelmalek 2014-1-27
a = [1 2 3 ; 4 5 6; 7 8 9];
b=[5 5 5]
c=[a;b]% add one row
c=[a;repmat(b,7,1)] %add 7rows
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user924
user924 2021-1-26
编辑：user924 2021-1-26
Perhaps try creating a 5x5 matrix of zeros and using a for loop to overwrite the elements that you want to be non-zero.
a =
0 0 0 0 0
0 0 0 0 0
0 0 1 2 3
0 0 4 5 6
0 0 7 8 9
a = zeros(5);
b = [1:9];
width = 3;
[m,n] = size(a);
for row = m:-1:1
for col = n:-1:n-2
if size(b) > 0
a(row, col) = b(end);
b = b(1:end-1);
end
end
end
a

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更多回答（2 个）

Amit
Amit 2014-1-27
A = [1 2 3;4 5 6;7 8 9];
A = [A; ones(7,3)*5];
Michael Hawks
Michael Hawks 2019-5-2
Another method:
a = [1 2 3 ; 4 5 6; 7 8 9];
b=[5 5 5];
a( end+1, : ) = b;
or
a( :, end+1 ) = b';

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