數(shù)學(xué)建模第四版第七章課后答案

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第一題clc%數(shù)據(jù)輸入

x=[68688787106106140140];

y=[9.798113.3249.007813.3559.791814.2779.656312.463];z=[0.08480.08970.07620.08070.06960.07530.06110.0651];%2插值cx=99;cy=10.3;

cz=griddata(x,y,z,cx,cy,'cubic')

%做表面圖

%meshz(cx,cy,cz)

cz=0.0724其次題

x=[129140103.588185.5195105.5157.5107.57781162162117.5];

y=[7.5141.52314722.5137.585.5-6.5-81356.5-66.584-33.5];

z=[48686889988949];%2插值

cx=75:0.5:200;

cy=-50:0.5:150;

cz=griddata(x,y,z,cx',cy,'cubic')

4.79844.75544.71294.67114.62994.58934.54944.51024.47184.4341

4.82394.78084.73834.69634.65504.61424.57424.53484.49624.4583

4.84924.63914.59904.55944.52064.4825

4.87444.66394.62364.58404.54504.5067

4.89924.68854.64814.60844.56934.5309

4.92374.71294.67244.63264.59344.5549

4.94784.73694.69644.65654.61724.5786

4.97154.76054.72004.68004.64074.6021

4.99464.78374.74314.70314.66384.6251

5.01724.80634.76574.72574.68644.6476

4.80614.83124.85604.88054.90464.92834.95144.97404.76354.78854.81334.83784.86194.88564.90874.93134.72144.74644.77114.79564.81974.84334.86654.88914.68004.70494.72954.75394.77804.80164.82484.84745.03914.99604.95334.91114.86944.82834.78774.74774.70834.6696

5.06035.01724.97454.93244.89074.84964.80904.76904.72964.6908

5.08085.03774.99504.95284.91124.87014.82954.78954.75014.7114

5.10034.88974.84924.80924.76984.7310

5.11904.90854.86794.82794.78864.7498

5.13674.92624.88564.84574.80634.7675

5.15334.94284.90224.86224.82284.7841

5.16884.95824.91764.87764.83824.7994

5.18304.97234.93174.89174.85224.8134

5.19674.98604.94544.90544.86604.8272

5.21105.00044.95984.91984.88044.8416

5.05735.07595.09365.11025.12575.13995.15365.16795.01465.03335.05105.06765.08315.09735.11105.12534.97254.99125.00895.02555.04105.05515.06885.08324.93094.94964.96734.98394.99935.01355.02725.04155.22605.18295.14035.09825.05655.01544.97484.93484.89544.8566

5.24165.19855.15595.11385.07215.03104.99044.95044.91104.8721

5.25785.21475.17215.13005.08835.04725.00664.96664.92714.8883

5.27465.23155.18895.06395.02334.98334.94384.9050

5.29205.24895.20625.08125.04065.00054.96104.9222

5.30995.26685.22415.09905.05845.01834.97884.9399

5.32835.28525.24255.11735.07675.03664.99704.9581

5.34735.30415.26145.13615.09545.05535.01574.97第三題x=1:0.5:10;y=x.^3-6*x.^2+5*x-3;y0=y+rand;

f1=polyfit(x,y0,1)%輸出多項(xiàng)式系數(shù)y1=polyval(f1,x);%計(jì)算各x點(diǎn)的擬合值

5.14675.16415.18195.20235.21915.10515.12245.14025.15865.1774plot(x,y,'+',x,y1)gridontitle('一次擬合曲線');figure(2);

f2=polyfit(x,y0,2)%2次多項(xiàng)式擬合y2=polyval(f2,x);plot(x,y,'+',x,y2);

gridontitle('二次擬合曲');figure(3);

f4=polyfit(x,y0,4)%4次多項(xiàng)式擬合y3=polyval(f4,x);plot(x,y,'+',x,y3)gridon

title('四次擬合曲線');figure(4);

f6