y =[0.005 0.015 0.032 0.013 0.003];
xx = 460:1:524;
yy =樣條(x,y,xx);
我猜的
情節(xx,yy)
dy 1 = diff(YY);
xx1 =(xx(1:end-1)+xx(2:end))/2;
Plot(xx1,dy1)%壹階導數圖
dy2 = diff(dy 1);
xx2 =(xx1(1:end-1)+xx1(2:end))/2;
Plot(xx2,dy2)%二階導數圖