我国城镇住房保障规模研究

2.8城市化率与时间T的函数关系式及图形程序

x8?22.1819?0.9037T?0.0519T2

clc,clear

x=[0 1 2 3 4 5 6 7 8 9 10]’

y=[22.12 23.13 24.23 25.41 26.68 28.04 29.48 31.01 32.63 34.33 36.61 ];

r=[ones(11,1),x,x.^2]; ab=r\\y

x0=0:1:10;

y0=ab(1)+ab(2)*x+ab(3)*x.^2; plot(x,y,'o',x0,y0,'r')

2.9房地产开发投资量与时间T的函数关系式及图形程序

x9?422.2566?120.6421T?16.7924T2

clc,clear

x=[0 1 2 3 4 5 6 7 8 9 10]’

y=[417.2482 559.1346 733.2146 939.4881 1177.9550 1448.6160 1751.4700 2086.5180

2453.7590 2853.1940 3324.6112 ]; r=[ones(11,1),x,x.^2]; ab=r\\y

x0=0:1:10;

y0=ab(1)+ab(2)*x+ab(3)*x.^2;

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plot(x,y,'o',x0,y0,'r')

3.最终预测程序

clc,clear

x1=[18671.8 21818.2 25238.2 28931.8 32899 ]; x2=[49872.5 57498.8 65799.5 74776.4 84431.3]; x3=[24.5257 23.1539 21.7821 20.4103 19.0385]; x4=[4765.5 569.6 6741.2 7906.3 9196.8]; x5=[13095 15268 17631 20182 22923];

x6=[28.0493 28.8240 29.5987 30.3734 31.1481 ]; x7=[97.8299 98.0881 98.3605 98.6945 99.1375]; x8=[38.4025 40.4999 42.7011 45.0061 47.4149]; x9=[3781.2 4288.1 4828.5 5402.6 6010.2];

y=2610.7+0.4*x1+0.1*x2-215.4*x3-x4+1130.4*x5-240.2*x6-168.9*x7+x8-8.2*x9

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