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I want to implement this matrix

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Janet
Janet 2012-2-23
编辑： Matt J 2013-10-23
0;Ip-l;0.............0
0;0;0;Ip-l;0.......0
.........................
0;0..............0;Ip-l
it is M-Nt x L matrix where M=128
L=65
p=64
1,3,5...columns are zero
2,4,6 columns have Ip-l in consecutive rows

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Dr. Seis
Dr. Seis 2012-2-23
>> A = zeros(4,8);
>> A(:,2:2:end) = 5*eye(4,4);
>> A
A =
0 5 0 0 0 0 0 0
0 0 0 5 0 0 0 0
0 0 0 0 0 5 0 0
0 0 0 0 0 0 0 5
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Dr. Seis
Dr. Seis 2012-2-23
Provided N is even:
M = 96;
N = 128;
A = zeros(M,N);
A(:,2:2:end) = (Ip-1)*eye(M,N/2)
Janet
Janet 2012-2-23
Yes..I got it..thank you so much and without your help, I wouldn't have got a solution..thank you so much

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John D'Errico
John D'Errico 2012-2-23
So many ways to do this. My favorite to recognize it as a block diagonal matrix.
d = repmat({[0 Ip-1]},1,64);
M = blkdiag(d{:});
If you want your matrix to be sparse (it surely should be, so why not use the capability?)
d = repmat({sparse([0 Ip-1])},1,64);
M = blkdiag(d{:});
I suppose this would work too. Making it sparse is trivial.
M = toeplitz([0, Ip-1,zeros(1,126)]);
M(2:end,:) = [];
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Janet
Janet 2012-2-23
using first command..how can i get 96 x 128 matrix
Janet
Janet 2012-2-24
d = repmat({[0 Ip-1]},1,64);
M = blkdiag(d{:});
using this command...i want 96x128 matrix...i.e M-Nt x L matrix
M=128;Nt=2;L=16

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Sean de Wolski
Sean de Wolski 2012-2-23
look at diag, and eye.
doc diag
doc eye
Please provide an actual matrix we can copy and paste into MATLAB (small example) if you would like more detail.
G A
G A 2012-2-23
A=[zeros(64,1),(Ip-l)*eye(64,64)]
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Janet
Janet 2012-2-23
I need a M-Nt x L matrix i.e 96 x 128

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