代码搜索结果

clear tdata=[0.25 0.5 1 1.5 2 3 4 6 8]; cdata=[19.21 18.15 15.36 14.10 12.89 9.32 7.45 5.24 3.01]; x0=[10,0.5]; x=lsqcurvefit('curvefun3',x0,tdata,cdata); f=curvefun3(x,tdata) x

t=[0 0.92 1.84 2.95 3.87 4.98 5.9 7.01 7.93 8.97 10.95 12.03 12.95 13.88 14.98 15.90 16.83 17.93 19.04 19.9 20.84 23.88 24.99 25.91]; h=[968 948 931 913 898 881 869 852 839 822 1082 1050 1021 994 965

t=[0 0.92 1.84 2.95 3.87 4.98 5.9 7.01 7.93 8.97 10.95 12.03 12.95 13.88 14.98 15.90 16.83 17.93 19.04 19.9 20.84 23.88 24.99 25.91]; h=[968 948 931 913 898 881 869 852 839 822 1082 1050 1021 994 965

x=0:0.1:1; y=[-0.447 1.978 3.28 6.16 7.08 7.34 7.66 9.56 9.48 9.30 11.2]; R=[(x.^2)' x' ones(11,1)]; A=R\y'

t=[20.5 32.5 51 73 95.7]; r=[765 826 873 942 1032]; aa=polyfit(t,r,1); a=aa(1) b=aa(2) y=polyval(aa,t); plot(t,r,'k+',t,y,'r')

function f=curvefun1(x,tdata) f=x(1)+x(2)*exp(-0.02*x(3)*tdata) % x(1)=a; x(2)=b,x(3)=k;

t=[0 0.92 1.84 2.95 3.87 4.98 5.9 7.01 7.93 8.97 10.95 12.03 12.95 13.88 14.98 15.90 16.83 17.93 19.04 19.9 20.84 23.88 24.99 25.91]; h=[968 948 931 913 898 881 869 852 839 822 1082 1050 1021 994 965

t=[0 0.92 1.84 2.95 3.87 4.98 5.9 7.01 7.93 8.97 10.95 12.03 12.95 13.88 14.98 15.90 16.83 17.93 19.04 19.9 20.84 23.88 24.99 25.91]; h=[968 948 931 913 898 881 869 852 839 822 1082 1050 1021 994 965

function f=curvefun3(x,tdata) d=300 f=(x(1)\d)*exp(-x(2)*tdata) % x(1)=v; x(2)=k

x=[1 2 4 7 9 12 13 15 17]; f=[1.5 3.9 6 11.7 12.6 18.8 20.3 20.6 21.1]; axis([0 18 1 22]) xlabel('x') ylabel('f') y=1:0.1:17; figure(1) plot(x,f,'o') gtext('已知数据点') hold on;pause bb1=inte