NACLab: A Matlab Toolbox for Numerical Algebraic Computation. Accurate numerical solutions of hypersensitive algebraic problems from approximate data. Intuitive polynomial computation interface in Matlab. Soving linear equation L(z) = b directly from linear transformation L even if it is rank-deficient, without matrix input from the use. NAClab features convenient WYSIWYG polynomial input, output and manipulations, solving linear equations directly from linear transformations, and solving nonlinear least squares problem with Gauss-Newtion iterations.