y\x |
1 | 2 | 3 | 4 |
1 | 98 | 110 | 122 | 136 |
2 | 91 | 112 | 131 | 141 |
3 | 73 | 118 | 145 | 190 |
4 | 43 | 129 | 170 | 230 |
Solution:
>> Z=[98,110,122,136; > 91,112,131,141; > 73,118,145,190; > 43,129,170,230]; >> i=1; p=polyfit(1:4,Z(i,:),3); z(i)=polyval(p,2.35); >> i=2; p=polyfit(1:4,Z(i,:),3); z(i)=polyval(p,2.35); >> i=3; p=polyfit(1:4,Z(i,:),3); z(i)=polyval(p,2.35); >> i=4; p=polyfit(1:4,Z(i,:),3); z(i)=polyval(p,2.35); >> p=polyfit(1:4,z,3); zp=polyval(p,2.74) zp = 124.82