fill an matrix from another matrix

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Noe alvarado
Noe alvarado 2012-4-23
Hi I have a matrix M
M11 M12 M13 M14
M21 M22 M23 M24
M31 M32 M33 M34
M41 M42 M43 M44
M51 M52 M53 M54
And i want to fill the matrix W with matrix M as:
M13 M14 (M11*M14 - M12*M13)
M23 M24 (M21*M24 - M22*M23)
M33 M34 (M31*M34 - M32*M33)
M43 M44 (M41*M44 - M42*M43)
M53 M54 (M51*M54 - M52*M53)

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Walter Roberson
Walter Roberson 2012-4-23
W = [M(:,[34]), M(:,1)*M(:,4)-M(:,2)*M(:,3)];
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Noe alvarado
Noe alvarado 2012-4-23
i have the next problem
>> M = [ 1 2 3 4; 1 2 3 4; 1 2 3 4; 1 2 3 4;4 3 2 1];
>> W = [A(:,[34]), A(:,1)*A(:,4)-A(:,2)*A(:,3)];
??? Index exceeds matrix dimensions.
My matrix M is the 5X4
And matrix W i want to be 5X3

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