function Y = small20(X,small)%        Zeros out small numbers in an array.%Inputs:  X - an array with some small elements that%              are to be replaced by zero%        small - max absolute value of numbers to be  %              set to zero%Output: Y - X array with small elements set to zero%%%%%%%%%%%%%%%%%% small20.m %%%%%%%%%%%%%%%%%%%%%   Discrete-Time Control Problems using        %%       MATLAB and the Control System Toolbox   %%   by J.H. Chow, D.K. Frederick, & N.W. Chbat  %%         Brooks/Cole Publishing Company        %%                September 2002                 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%Y = X;vec = find(abs(X) <= abs(small) & X ~= 0);Y(vec) = 0*vec;%%%%%%%%%%