创作编号:
GB8878185555334563BT9125XW
创作者:凤呜大王*
用拉格朗日插值法计算x每改变0.5时y的值,即x 取0.5, 1, 1.5, … , 14.5 时对应的y值。
程序如下
程序运行结果:
>> x=[0 3 5 7 9 11 12 13 14 15];
>> y=[0 1.2 1.7 2.0 2.1 2.0 1.8 1.2 1.0 1.6]; >> xi=0.5:0.5:14.5;
>> yi=lang(x,y,xi)
yi =
Columns 1 through 8
-15.4117 -15.9238 -10.9898 -5.4272 -1.2253 1.2000 2.1765 2.2666 Columns 9 through 16
1.9894 1.7000 1.5703 1.6249 1.7995
2.0000 2.1477 2.2040 Columns 17 through 24
2.1752 2.1000 2.0269 1.9904 1.9928 2.0000 1.9537 1.8000 Columns 25 through 29
1.5272 1.2000 0.9656 1.0000 1.3480
>> plot(x,y,'b:',xi,yi)
运行图:
创作编号:
GB8878185555334563BT9125XW
创作者:凤呜大王*