ysum=a[i]+a[i-1]+...+a[i-n+1]
xsum=i+i-1+..+i-n+1
xxsum=i*i+(i-1)*(i-1)+...+(i-n+1)*(i-n+1)
xysum=i*a[i]+(i-1)*a[i]+...+(i-n+1)*a[i-n+1]
k=(xysum -(ysum/n)*xsum)/(xxsum- xsum/n * xsum) //斜率
b= ysum/n - k*xsum/n
forcast[i]=k*i+b //线性回归
tsma[i] = forcast[i]+k //线性回归+斜率
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