x=lsqcurvefit('nonlinefit2',x0,t,c)
f=nonlinefit2(x,t)
hours=1:12;
temps=[5 8 9 15 25 29 31 30 22 25 27 24];
h=1:0.1:12;%
t=interp1(hours,temps,h,'spline'); (
)
plot(hours,temps,'+',h,t,hours,temps,'r:') %
xlabel('Hour'),ylabel('Degrees Celsius
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6k=sym('k') % k ;
symsum(S) S , k 0 k-1.
symsum(S,v) S , v v 0 v-1.
symsum(S,a,b) S , k a b.
symsum(S,v,a,b) S , v v a b.
7
dsolve('fangcheng1 ','fangcheng 2'..,'chu shi tiao jian ','bian liang' )
[ ]=ode45/ode23/ode15s[ ]
[ ]
8
x=0.1:0.01:0.18;x=[x,0.2,0.21,0.23]';
y=[42,41.5,45,45.5,45,47.5,49,55,50,55,55.5,60.5]';
X=[ones(12,1),x];
>> polyfit(x,y,1)
[b,bint,r,rint,stats]=regress(y,X,0.05);
>> b,bint,stats,rcoplot(r,rint)
9
x=linspace(a,b,n);