视频

拓展学习

机动车刹车距离问题

v=20:10:150;

vs=v.*(1000/3600);

d1=10.*vs;

d2=[3.15,7.08,12.59,19.68,28.34,38.57,50.4,63.75,78.71,95.22,113.29,132.93,154.12,176.87];

d3=10;

d=d1+d2+d3;

vi=20:1:150;

di=interp1(v,d,vi,'spline');

x=abs(di-120);

[y,i]=sort(x);

vi(i(1))

plot(vi,di,vi(i(1)),di(i(1)),'rp')

>> j=find(vi==125);

>> di(j)

>> plot(vi,di,125,480.14,'rp')

沙盘制作问题

x=0:200:1800;

y=x';

z=[2000,2000,2001,1992,1954,1938,1972,1995,1999,1999;2000,2002,2006,1908,1533,1381,1728,1959,1998,2000;

   2000,2005,2043,1921,977,897,1310,1930,2003,2000;1997,1978,2009,2463,2374,1445,1931,2209,2050,2003;

   1992,1892,1566,1971,2768,2111,2653,2610,2121,2007;1991,1875,1511,1556,2221,1986,2660,2601,2119,2007;

   1996,1950,1797,2057,2849,2798,2608,2303,2052,2003;1999,1999,2079,2685,3390,3384,2781,2165,2016,2000;

   2000,2002,2043,2271,2668,2668,2277,2049,2003,2000;2000,2000,2004,2027,2067,2067,2027,2004,2000,2000];

surf(x,y,z);

x1=0:100:1800;

y1=x1';

z1=interp2(x,y,z,x1,y1,'spline');

surf(x1,y1,z1);

x2=0:50:1800;

y2=x2';

z2=interp2(x1,y1,z1,x2,y2,'spline');

surf(x2,y2,z2);

contour(x2,y2,z2,12)