ex0109.m

来自「《精通MATLAB科学计算》一书的实例源代码」· M 代码 · 共 13 行

function ex0109()
N = 100000; 
a = [1:N]; 
x = 1;
tic % initialize the timer
p1 = sum(a.*x.^[N-1:-1:0]); %plain multiplication
p1, toc % measure the time passed from the time of executing ’tic’
tic, p2=a(1);
for i = 2:N %nested multiplication
    p2 = p2*x + a(i);
end
p2, toc
tic, p3=polyval(a,x), toc