Publisher review:matrixop - A Matlab object that acts just like a matrix but represents a linear operator as a function. Many of the iterative methods in Matlab are designed to work with either a function handle to provide A*x, or a matrix A directly. Developing code for each paradigm is a pain. The matrixop class yields the flexibility of Matlab syntax using function handles or anonymous functions. n = 100;A = spdiags([e -2*e e], -1:1, n, n);Afun = @(x) [-2*x(1) x(2); x(1:n-2) - 2*x(2:n-1) x(3:n); x(n-1)-2*x(n)];op = matrixop(A);x = linspace(-1,1,n)';b = op*x; % calls Afun(x)xminres = minres(op,b,[],200); % runs minres on op where op*x = Afun(x)xgmres = gmres(op,b,[], [],200);The advantage of the matrixop class is that you can write a single code that works for either a Matlab matrix or a function handle/linear operator representation. This simplifies the code and eliminates syntactic juggling that can cause bugs.The zip file includes numerous examples of how to use the matrixop class along with a sample showing the performance implications. See the demo directory. Requirements: ยท MATLAB Release: R14
matrixop is a Matlab script for Mathematics scripts design by David Gleich.
It runs on following operating system: Windows / Linux / Mac OS / BSD / Solaris.
Operating system:Windows / Linux / Mac OS / BSD / Solaris
matrixop script details 
