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发表于 2012-6-17 06:42:58
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yunboyi 发表于 2012-6-16 22:57
谁有蒙特卡洛的检验程序?能否共享一下?
不胜感激!
North 的好像不算检验
你用 NCL 吗, 我按照这文章的方法编了一个小程序:
http://journals.ametsoc.org/doi/pdf/10.1175/1520-0493(1982)110%3C0001%3AASTFPC%3E2.0.CO%3B2
NCL SCRIPT:
--------------------------------------------------------------
;;; see Monthly Weather Review Vol 110 No 1, Jan 1982
;;; "A significance test for principal components applied to a ...."
;;; USER MODIFICATION
p = 64 ;; observation points
n = 200 ;; number of times
rdim = 100 ;; number of experiments
cutoff = 95 ;; 95 if rdim = 100
;;; END USER MODIFICATION
data = new((/p,n/),"float")
u = new((/p,rdim/),"float")
u_sorted = new((/p,rdim/),"float")
do r=0,rdim-1
do j=0,p-1
data(j,:) = random_normal(0.,1.,n)
end do
eof = eofcor(data,p)
sum_eigenvalue = sum(eof@eval)
u(:,r) = eof@eval/sum_eigenvalue
end do
;;; reordering
do j=0,p-1
dum1 = u(j,:)
dum2 = dim_pqsort(dum1,2)
u_sorted(j,:) = dum1
end do
print(u_sorted(0:4,cutoff-1))
--------------------------------------------------------------------------------
我不会 matlab, 但这文章用的方法很简单也很容易编程.
问题是算 EOF 只可以是 correlation matrix.
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