转换MatLab代码-混淆

Question

基本上，我有最后一段代码要从MatLab转换为C++。

该函数接受2D向量，然后根据2个条件检查2D向量的元素，如果不匹配，它将删除块。但是我搞不懂MatLab中的代码想要返回什么，是2D还是1D向量？代码如下：

function f = strip(blocks, sumthresh, zerocrossthresh)

% This function removes leading and trailing blocks that do 
% not contain sufficient energy or frequency to warrent consideration.
% Total energy is measured by summing the entire vector.
% Frequency is measured by counting the number of times 0 is crossed.
% The parameters sumthresh and zerocrossthrech are the thresholds,
% averaged across each sample, above which consideration is warrented.

% A good sumthresh would be 0.035
% A good zerocrossthresh would be 0.060

len = length(blocks);
n = sum(size(blocks)) - len;
min = n+1;
max = 0;
sumthreshtotal = len * sumthresh;
zerocrossthreshtotal = len * zerocrossthresh;
for i = 1:n
currsum = sum(abs(blocks(i,1:len)));
currzerocross = zerocross(blocks(i,1:len));
if or((currsum > sumthreshtotal),(currzerocross > zerocrossthreshtotal))
if i < min
  min = i;
end
if i > max;
  max = i;
  end
end
end

% Uncomment these lines to see the min and max selected
% max
% min

 if max > min
   f = blocks(min:max,1:len);
 else
 f = zeros(0,0);
end

或者，与其返回另一个向量(无论是1D还是2D)，实际上发送向量的内存位置并从中删除块会更好吗？举个例子..

for(unsigned i=0; (i < theBlocks.size()); i++)
{
  for(unsigned j=0; (j < theBlocks[i].size()); j++)
  {
      // handle theBlocks[i][kj] .... 
  }
}

另外，我不理解这句话：

currsum = sum(abs(blocks(i,1:len)));

基本上：(i,1:len)

有什么想法吗？谢谢:)

Answer 1

blocks(i,1:len)告诉数组，它想要从blocks[i][1 to the end]转过来。因此，如果它是一个3x3数组，它会这样做：

blocks[i][1]
blocks[i][2]
blocks[i][3]
.
.
.
blocks[i][end]

然后取矩阵内容的绝对值，并将它们相加。它返回一个x矩阵，但长度要么是0x0，要么是(max)X(len)。