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Putting 1 around the matrix

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Offroad Jeep
Offroad Jeep 2016-9-23
评论： Offroad Jeep 2016-9-23
Hi I have a 3X3 matrix and want to put 1 around the matrix as it will become 4X4 matrix.....
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Offroad Jeep
Offroad Jeep 2016-9-23
yes I need 3X3 matrix Converted to 5X5 by putting 1 all around

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Andrei Bobrov
Andrei Bobrov 2016-9-23
Let A - your matrix [3 x 3]:
A = magic(3);
out = ones(2 + size(A));
out(2:end-1,2:end-1) = A;

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Adam
Adam 2016-9-23
编辑：Adam 2016-9-23
a = zeros(3);
b = padarray( a, [1 1], 1 );
would put 1s all the way round, but this produces a 5x5 matrix. A 4x4 matrix result is ambiguous without being more clearly defined.
Note: This requires the Image Processing Toolbox though

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