function dx=shier(t,x) dx=zeros(2,1); dx(1)=x(1)*(1-0.1*x(2)); dx(2)=x(2)*(-0.5+0.02*x(1));
http://www.codebf.com/read/4/143
clear x=0:0.01:1; y=-5*(1-x).^(4/5)/8+5*(1-x).^(6/5)/12+5/24; plot(x,y,'*')
http://www.codebf.com/read/4/144
[t,x]=ode45('shier',[0 15],[25 2]); plot(t,x(:,1),'-',t,x(:,2),'*') figure(2) plot(x(:,1),x(:,2))
http://www.codebf.com/read/4/145
load gas price1 [h,sig,ci] = ztest(price1,115,4)
http://www.codebf.com/read/4/147
load data1 x=data(2,:) mean=mean(x) median=median(x) std=std(x) var=var(x) skewness=skewness(x) kurtosis=kurtosis(x)
http://www.codebf.com/read/4/148
load gas [h,sig,ci] = ttest2(price1,price2)
http://www.codebf.com/read/4/149
load dj hist(x,10)
http://www.codebf.com/read/4/150
load dj [h,sig,ci] = ttest( x ,594)
http://www.codebf.com/read/4/151
P=normcdf(1)-normcdf(-1)
http://www.codebf.com/read/4/152
load dj [muhat,sigmahat,muci,sigmaci] = normfit(x)
http://www.codebf.com/read/4/153
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