... surf, for the seashell example, with K, to paint the seashell surface with the Mandelbrot set. 15. Sparse Matrix Computations A sparse matrix is one with mostly zero entries. MATLAB provides ... functions will take either symbolic or numeric arguments. Computations with symbolic rational matrices can be carried out exactly. Try, for example, c = floor(10*rand(4)) D = sym(c) A = inv(D) ... when dealing with sparse matrices, use matrix expressions instead of for loops and vector or scalar expressions. If you must operate on the rows of a sparse matrix A, work with the columns...