phat phreak wrote: > > > Hello all, > > I need to create a square matrix that has square block matricies > along the diagonal and zeros everywhere else. That is to say, I > need > to create a block diagonal matrix where each submatrix is > different. > The overall matrix needs to have the form: > > M = > - - > | sm1 0 0 | > | 0 sm2 0 | > | 0 0 sm3 | > - - > > Any advice would be greatly appreciated. Either post a reply or > email me directly(phatphreak74@yahoo.ca). > > thanks in advance, > the phreak Hi! Use blkdiag: a=magic(2); b=ones(2); c=hankel(1:2); D=blkdiag(a,b,c) HTH PB

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Hello, I am a new beginner of Matlab and I want to create a Diagnoal Matrix with the main diagnoal as (A1,A2,A3,....,Aj) where Aj is also a matrix which is defined as (a11,a12,a13;a21,a22,a23;a31,a32,a33). How can I define Aj as a variable in the m file then create the diagnoal matrix through Aj? Could someone help on this please? Many Thanks in Advance! "Jie " <jz286@cam.ac.uk> wrote in message <h6selu$9ng$1@fred.mathworks.com>... > Hello, > > I am a new beginner of Matlab and I want to create a Diagnoal Matrix with the main diagnoal as (A1,A2,A3,....,Aj) w...

Hi, I'm a relatively new user in MATLAB and I'd appreciate if anyone can help me out with an answer or a reference on how to create block diagonal matrices from several vectors. As an example, if I have the following 4 vectors, d11=[1 5 9 13]; d12=[2 6 10 14]; d21=[3 7 11 15]; d22=[4 8 12 16]; what's the best way to create matrix D such that: D= 1 2 0 0 0 0 0 0 3 4 0 0 0 0 0 0 0 0 5 6 0 0 0 0 0 0 7 8 0 0 0 0 0 0 0 0 9 10 0 0 0 0 0 0 11 12 0 0 0 0...

Hi, does anyone know how to create what I think is called a sparse block diagonal matrix? Here is an example: I have one matrix that is sparse e.g. [1 0 0 0 ; 0 0 1 0 ; 0 0 1 0 ; 0 0 0 1 ] and want to create a new matrix where this matrix is repeted e.g. 10 times in the diagonal of a larger matrix i.e. a 40 x 40 matrix. How can I do this in a the most sparse and efficieant way? "Markus Nordberg" wrote in message <n7qmd3$3bc$1@newscl01ah.mathworks.com>... > Hi, > does anyone know how to create what I think is called a sparse block diagonal matrix? > ...

Dear Group members, I'm trying to solve the following algebra problem Consider a skew-symmetric matrix of the form: B=[0,A; -At,0] where 0 stands for a null matrix and At the transpose of matrix A. Is it possible to obtain a transformation of this matrix such as the new matrix in the new coordinates would be a block diagonal matrix of the form: C=[C1,0; 0,C2] with C=Tt * B * T, being T the transformation matrix? If possible how can I obtain such a transformation matrix? Thanks, RV ...

Hi Suppose i have a matrix A= [1 4 5 8 7 3 6 5 2] I want to have a matrix B such each row of it has a row from A at the diagonal B=[1 4 5 0 0 0 0 0 0 0 0 0 8 7 3 0 0 0 0 0 0 0 0 0 6 5 2] how can i do it. I could do it with blkdiag but it supposes i input each row for the matrix, however i need something general since i need it for bigger matrices Thanks "matlab " <keep_smiling2100@yahoo.fr> wrote in message <jtkrgk$js0$1@newscl01ah.mathworks.com>... > Hi > Su...

Hi all, Does anybody know what is the most efficient way to cobstruct a diagonal matrix from a vector of entries? For example I want to create: 1 0 0 0 2 0 0 0 3 from: a=1:3; "blkdiag" does not work here since I need to enter the vector elements one by one which I can't since "a" can be very large. Thanks, Elnaz On 9/5/2013 3:16 PM, Elnaz wrote: > Hi all, > > Does anybody know what is the most efficient way to cobstruct a diagonal ?matrix from a vector of entries? > For example I want to create: > 1 0 ...

This is quite a tricky for me. I need to construct a matrix A(a,b) where a>b. It will have a-b+1 number of diagonals containing b elements each. Where ith diagonal starting from (i,1) and ending (b+i-1,b) I have these diagonals with me. How do i construct this matrix A? I do not want to use spdiags(). I tried it and find it too expensive. mohitt wrote: > > > This is quite a tricky for me. > I need to construct a matrix A(a,b) where a>b. > It will have a-b+1 number of diagonals containing b elements each. > Where ith diagonal starting from (i,1) and ending (b+i-1,b) &...

Hi, Let say I have a vector B=[1 0] and I want to use this vector B repeating in this matrix A having size [8x16]. First, I initialize the matrix A with all zeros then I want to have the outcome as below: A= [1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0]; How can I use that vector B repeat several times on matrix A using some code? It looks like an ...

Hello, How would you find whether a given symmetric matrix is block diagonalizable (under shuffling of the indices)? My matrix is very large, binary and symmetric. It is not sparse, it has ~ 10% 1s. I want to find whether some indices cluster with others, or whether the whole thing is irreducible. Thanks, Pedro Pedro Bordalo wrote: > > > Hello, > > How would you find whether a given symmetric matrix is block > diagonalizable (under shuffling of the indices)? > > My matrix is very large, binary and symmetric. It is not sparse, > it > has ~ 10% 1s. I want to fi...

Suppose you have block A, B, C, ... How do you create a block diagonal matrix with blocks A, B, C, ... on the diagonal? Without looping through the elements of course. / Any ideas are much appreciated (google didn't help me) john wrote: > Suppose you have block A, B, C, ... How do you create a block diagonal > matrix with blocks A, B, C, ... on the diagonal? Without looping > through the elements of course. > > / Any ideas are much appreciated (google didn't help me) Does HELP BLKDIAG do what you want? -- Steve Lord slord@mathworks.com > &g...

I have two qubit density operator which have an n term approaching to infinity. I want to construct density matrix from it. which is a block dioganal matrix.I have some problem to do so.. Any help? On 4/3/2013 3:11 AM, Niaz khan wrote: > I have two qubit density operator which have an n term approaching to > infinity. I want to construct density matrix from it. which is a block > dioganal matrix.I have some problem to do so.. Any help? >> lookfor diagonal blkdiag - Block diagonal concatenation of matrix input arguments. diag - Diagonal matrices and diagonals of...

Dear all, I am no big Matlab expert and for some hours now, I have been struggling with this "simple" program. However, I can't figure it out... clear all N=5; boundary = 1; diag_coeff=[1 -1]; position=[-1]; values=[]; for number=1:size(diag_coeff,2) values(:,number) = ones(N,1).*diag_coeff(1,number); placement(1,number) = (position -1 + number); end if boundary == 1; % if ok, create boundary values(:,number+1)=ones(N,1).*diag_coeff(1,number); % left of diagonal placement(1,number+1) = (-N+(size(diag_coeff,2))-1); % left of diagonal values(:,number+...

I want to build a diagonal matrix such as 1 2 0 0 0 0 0 0 3 4 0 0 0 0 0 0 5 6 with a given (arbitrary) matrix, 1 2 3 4 5 6 without using loops and cell arrays (conversion takes time) blkdiag works with only parameters (a,b,c,d...) a,b,c,d... are row vectors. suggestions? Tim Hi Tim, I have a solution. Let M = [1 2; 3 4; 5 6]; Then, the matrix you are looking for can be computed with the following two lines: A = [diag(M(:,1)) diag(M(:,2))]; B = A(:,reshape(reshape(1:6,3,2)',1,6)) Hope this helps, Danny "Tim Yang" <dlISCool@gmail.com> wrote in message <h0u...

Please Steve, you didn't tell how I can get the off diagonal matrices? The 2D laplacian matrix has off diagonal matrices of (alpha)I where I is identity matrix of the same dimension as the diagonal matrix. final matix: A = |B1 (a1)I ........ ... | |(a2) B2 (a2)I ........ | |....(a3)I B2 (a3)I ...| |.... ... ... | | (an)I Bn | Your help will be much appreciated! cheers E4Home wrote: > Please Steve, you didn't tell how I can get the off diagonal > matrices? The 2D laplacian matrix has off diagonal matrices of &g...

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