数据拟合MATLAB实验作业

1、1、 在飞机的机翼加工时，由于机翼尺寸很大，通常在图纸上只能标出部分关键点的数据. 某型号飞机的机翼上缘轮廉线的部分数据如下。用插值法求X每改变0.1时的y值，画出图 形表示。x04.749.051938577695114133152171190v05.23 8.111.9716.151716.3414.63 12.16 6.697.033.990 x=0 4.74 9.05 19 38 57 76 95 114 133 152 171 190；v=0 5.23 8.1 11.97 16-15 17.1 16.34 14.63 12.16 6.69 7.03 3.99 ()； cx=0：0.1

2、：190；cy=intcrp1 (xcx/splinc1);ploMxdT+kX'Cyxy,:)xlabclfc h aiig*) ,yl abclfku ang)2、巳知观测数据点如表所示:X00.10.20.30.40.50.60.70.80.91y-0.4471.9783.286.167.087.347.669.569.489.311.2分别用1次和3次多项式函数曲线拟合这些数据点，画出图形。x=0:0.1:l;v=-0.447 1.978 3.28 6.16 7.08 7.34 7.66 9.56 9.48 9.3 11.2;A=polyfit(x>y,l)z=polnv

3、ral(A,x);pkn(x»y,k+如x=0:0.1:l;v=-0.447 1.978 3.28 66 7.08 7.34 7.66 9.56 9.48 9.3 11.2;A=polyfit(x>v,3)z=pohfval(A,x);pk)t(x,y；k+,>x,z；rr)3.教材P327习题1cK =0.0728 cKA =0.0731T=68 68 87 87 106 106 140 140;P=lc+03*97981 13.321 9.0078 13.355 9.7918 14.2779 9.6563 12.463;K=0.0848 0.0897 0.0762 0

4、.0807 0.0696 0.0753 0.0611 0.0651; cT=68:0.5:140；cP=l e+03*9.0078:0.05： 1 c+03*14.277; cK=griddara(T,PK99；lc+03*10.3；cubic,) cKA=griddata(T>P,K,99,le+03*10.3；lincaO4、教材P327习题4,初始值为VfO, T =0.05x =5.55773.5002 f =6.14906.66167.491381478.58328.93539.39879.66046.14906.66167.49138.11478.58328.93539.39879.6604 function f=dianya(x»Of=10-(10-x(l)*exp(-t/x(2)c=p).5 12 34579；V=6.36 6.48 7.26 8.22 8.66 8.99 9