e421.m

matlab算法集 matlab算法集

%----------------------------------------------------------------------
% Example 4.2.1: Piecewise-Linear Fit 
%----------------------------------------------------------------------

% Initialize
 
   clc
   clear
   n = 9;
   p = 20*n;
   x = [0 : 8]';
   y = [6 0 2 -1 3 4 -2 5 4]';
   X = zeros (p,2);
   Y = zeros (p,2);

% Perform fit and plot

   fprintf ('Example 4.2.1: Piecewise-Linear Fit\n');
   show ('x',x)
   show ('y',y)
   X(:,1) = linspace(x(1),x(n),p)';
   Y(:,1) = interp1 (x,y,X(:,1));
   for i = 1 : p
      j = min (i,n);
      X(i,2) = x(j);
      Y(i,2) = y(j);
   end
   graphxy (X,Y,'Piecewise-Linear Fit','x','y','s');
%----------------------------------------------------------------------