Matlab中每行每一列的双循环 [英] Double loop for each column per row in matlab

问题描述

下面的代码完成了应做的事情，并且只占用一列.

The following code does what it should and works of one column.

%% Working loop


z = HongKongPrices(1:end,114);

 zeros = false(size(z));

 r = size(z,1);
 c = size(z,2);


for i = 5:r
    if z(i) == z(i-4) && z(i) == z(i-3)
        zeros(i-3:i) = 1 
    end
end

z(zeros) = NaN

我试图为HongKongPrices在每列的基础上执行for循环，但是以下代码失败(出于时间原因，我从三列开始).

I am trying to execute the for-loop on a per column basis for HongKongPrices, however the following code fails (I am starting with three columns for time reasons).

 %% Non workling loop

 z = HongKongPrices(1:end,[80 85 115]);

 zeros = false(size(z));

 r = size(z,1);
 c = size(z,2);

 for k = 1:c
      x = z(1:end,k)
    for i = 5:r
        if x(i) == x(i-4) && x(i) == x(i-3)
            zeros(i-3:i) = 1 
        end
    end
 end

x(zeros) = NaN

推荐答案

您根本不需要变量x.您可以在if语句中使用逻辑索引.代替x(i)，使用x(i,k)，依此类推.当然，您必须对zeros做同样的事情.

You don't need the variable x at all. You can use logical indexing in you if statement. Instead of x(i), use x(i,k) and so on. Of course you have to do the same with zeros.

z = HongKongPrices(1:end,[80 85 115]);

zeros = false(size(z));
r = size(z,1);
c = size(z,2);

for k = 1:c
    for i = 5:r
        if z(i,k) == z(i-4,k) && z(i,k) == z(i-3,k);
            zeros(i-3:i,k) = 1 
        end
    end
end

z(zeros) = NaN;

PS:zeros是Matlab函数，因此最好使用另一个变量名.这样，您将无法在代码中使用zeros函数.

PS: zeros is a Matlab function, so it would be better to use another variable name. Like this you won't be able to use the zeros function in your code.

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