2/24/2023 0 Comments Matlab diagWhich strikes me as particularly inelegant & unnecessarily verbose (I have heard several times that if you have to use a for loop in matlab, you're probably doing it the wrong way. This is just for a uniform probability distribution, but ultimately I will be looking at more complicated distributions, so the more control over this entire matrix I have, the better.Īt the moment, I've resolved the issue in the following way: The matrix P represents probabilities associated with Ising spins.I think it is actually called a rank 4 tensor in 2D (?) - it has NxN 2x2 matrices as its elements that describe the probabilities of finding any given pair of spins aligned or anti-aligned.Īs such, the diagonal 2x2 elements of P have a different probability distribution (viz. I'm rather new to MATLAB so forgive me if this seems like a dumb question. If there are other ways of creating the matrix I'm looking for, that's great too, but it would be neat if I could get this particular method to work. example, ) places the elements of vector on the th diagonal. Obviously, I'm not going to manually type in the block N-1 times, so I was hoping that maybe someone out there would have a clever solution to this problem. Does MATLAB optimize diag(AB) Author: Elizabeth Robinson Date: Create diagonal matrix or get diagonal elements of matrix collapse all in page Syntax Description example ) returns a square diagonal matrix with the elements of vector on the main diagonal. In my case, all of the blocks are identical (viz., they are the tribanded matrix, B), and I want to place N-1 of these blocks on the diagonal of the larger matrix. The problem I have with this function however, is that it doesn't create a block diagonal matrix of arbitrary size-it only concatenates the numer of arguments you input. vector 1 2 3 4 5 diagonal diag(vector) Output: diagonal 1 0 0 0 0 0 2 0 0 0 0 0 3 0 0 0 0 0 4 0 0 0 0 0 5 In the above code, we made a 5x5 diagonal matrix with the diagonal entries stored in the variable vector. For example, let’s make a diagonal matrix from a given vector. It's called "blkdiag", and it works by taking all of the input arguments, which are matrices, and placing them on the diagonal of a larger sparse matrix. To make a diagonal matrix or to get the diagonal entries of a matrix, you can use the diag() function in MATLAB. So, using MATLAB, I'm trying to create the block diagonal matrix for the central difference approximation to the 2D laplacian operator in rectangular coordinates, and I've stumbled on to what looks like a pretty useful function.
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