成员检查和日期范围检查Matlab

时间:2011-03-22 16:39:28

标签: matlab matrix date-range

我有两个带有相同ID的矩阵。我需要从mat1中提取那些日期在mat2中的日期±5天内的ID行。 mat2的操作也相同。请在此处查看数据:UNIQCols = [1 2] ; dateCol = [3] ; valueCol = [4] ; dayRange = +- 15days

      % UniqCol  Date    Value
mat1 = [2001 2   733427  1001 ;
        2001 2   733793  2002 ;
        2001 2   734582  2003 ;
        3001 1   734220  30   ;
        3001 1   734588  20   ;];
mat2 = [2001 2   733790  7777 ;
        2001 2   734221  2222 ; 
        3001 1   734220  10   ; 
        3001 1   734588  40   ;] ;

ans1 = [2001 2 733793 2002 ; 3001 1 734220 30 ; 3001 1 734588 20 ] ;
ans2 = [2001 2 733790 7777 ; 3001 1 734220 10 ; 3001 1 734588 40 ] ;

这需要是一个矢量化操作! ID按日期递增顺序排序。日期按Q或年度分开。所以范围总是<< (date2-date1)请帮助和谢谢!

1 个答案:

答案 0 :(得分:0)

这是我在评论中提到的基于similar question的函数。请记住,您的矩阵必须按日期排序。

function match_for_xn = match_by_distance(xn, xm, maxdist)
%#Generates index for elements in vector xn that close to any of elements in
%#vector xm at least by distance maxdist

match_for_xn = false(length(xn), 1);
last_M = 1;
for N = 1:length(xn)
  %# search through M until we find a match.
  for M = last_M:length(xm)
    dist_to_curr = xm(M) - xn(N);
    if abs(dist_to_curr) < maxdist
        match_for_xn(N) = 1;
        last_M = M;
        break
    elseif dist_to_curr > 0
        last_M = M;
        break
    else
      continue
    end

  end %# M
end %# N

测试脚本:

mat1 = sortrows([
        2001 2   733427  1001 ;
        2001 2   733793  2002 ;
        2001 2   734582  2003 ;
        3001 1   734220  30   ;
        3001 1   734588  20   ;
       ],3);
mat2 = sortrows([
        2001 2   733790  7777 ;
        2001 2   734221  2222 ; 
        3001 1   734220  10   ; 
        3001 1   734588  40   ;
       ],3);

mat1_index = match_by_distance(mat1(:,3),mat2(:,3),5);
ans1 = mat1(mat1_index,:);
mat2_index = match_by_distance(mat2(:,3),mat1(:,3),5);
ans2 = mat2(mat2_index,:);

我没有为您的问题尝试任何矢量化解决方案。如果您对此解决方案有任何尝试,请检查时间和内存消耗(包括排序步骤)。