Matlab 如何将其完全矢量化？

我写了这段代码来同步两个金融时间序列。我下载了一些外汇数据，有一些交易缺失。这里的想法是得到最大的一组，并将其他的与这个同步

例如，我有一套像这样的

    a= [20010110 2310 10;
       20010110 2311 20;
       20010110 2313 30]
    b= [20010110 2309 50;
    20010110 2312 52]

我想要然后我得到这个

    c =[20010110 2310 50;;
       20010110 2311 50
       20010110 2313 52]  

c和a差不多，但这只是一个索引

所以我写了这个

    function [setAjustado] =  ajustar(SetCorreto,SetParaAjustar)

    dataCorreto = SetCorreto(:,1); % get the date from the correct set
    dataAjustar = SetParaAjustar(:,1); % get the date from the set to be corrected 
    minCorreto = SetCorreto(:,2); % get the timeframe from the correct set
    minAjustar = SetParaAjustar(:,2);get the timeframe from the set to be corrected 
    setAjustado = zeros(size(SetCorreto)); %corrected set
    idxI = dataAjustar == dataCorreto(1); %generating the first range to search

     for i=2:size(SetCorreto,1)
     try

       if (i >1 && dataCorreto(i) ~= dataCorreto(i-1)) % if the dates are the same, i dont need to look for the range again
         idxI = dataAjustar == dataCorreto(i); % generate the range to search
         idxIa = find(idxI==1,1); % find the first index
       end

       idx =  find(minAjustar(idxI)>=minCorreto(i),1) +idxIa; % find the nearest occurency in the set to be corrected to match the correct set
       setAjustado(i,:) = SetParaAjustar(idx,:); %replace all the line. This line have prices close, max, low and open. 
       setAjustado(i,2) = minCorreto(i); %adjust the timeframe to match the correct set
     catch
        if i==1 % in case of i to be greater then the size of set to be corrected
          a=i;
        else
          a= i-1;
      end
     setAjustado(i,:) = setAjustado(a,:); % will copy the last line created in corrected set

      end
     end

但是我觉得这件事很慢。。。有人能帮我加快速度吗

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Tks提前

根据您发布的数据和您的评论，我尝试了以下几点：

% first two columns are considered "keys", last one contains the values
a = [20010110 2310 10;
     20010110 2311 20;
     20010110 2313 30];
b = [20010110 2309 50;
     20010110 2312 52];

% get a row identifier for each instance
[~,~,ind] = unique([a(:,1:2);b(:,1:2)], 'rows');
ind_a = ind(1:size(a,1));
ind_b = ind(size(a,1)+1:end);

% merge the data
c = nan(max(ind),size(a,2));
c(ind_a,1:end-1) = a(:,1:end-1);
c(ind_b,:) = b;

% fill-in missing values from last know values
for i=2:size(c,1)
    if isnan(c(i,end))
        c(i,end) = c(i-1,end);
    end
end

% only keep instances matching A's rows
c = c(ind_a,:);

结果是：

>> c
c =
    20010110        2310          50
    20010110        2311          50
    20010110        2313          52

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如果实际数据包含更多列，则需要相应地调整代码。

我不明白“syncrhonise”是什么意思。你到底想做什么计算？阿姆罗，我做了一点修改，一切都很顺利，非常感谢！%合并数据c=nan（最大值（ind），大小（a，2））；c（ind_a，1:2）=a（：，1:2）；c（ind_b，：）=b；%如果isnan（c（i，end））c（i，3:end）=c（i-1,3:end），则填写i=2:size（c，1）的最后已知值中缺少的值；结束