2
基本上,我试图将一个庞大的1D矢量分成一个给定大小的块,这个大小通过函数传递。该函数应该返回一个2D矢量,然后我可以访问不同的块。我找到了一个合适的算法来做到这一点,但是,它是在Matlab中,我不明白如何将元素放置在2D矢量中。用C++重写Matlab代码
MATLAB代码:
function f = block(v, N, M)
n = length(v);
maxblockstart = n - N + 1;
lastblockstart = maxblockstart - mod(maxblockstart-1 , M);
numblocks = (lastblockstart-1)/M + 1;
f = zeros(numblocks,N);
for i = 1:numblocks
for j = 1:N
f(i,j) = v((i-1)*M+j);
end
end
这是我用C尝试++(如果它的坏对不起):
vector<iniMatrix> subBlocks(vector<int>& theData, int N, int M)
{
// This method splits the vector into blocks
// Each block has size N.
// and consecutive blocks differ
int n = theData.size();
int maxblockstart = n - N+1;
int lastblockstart = maxblockstart - (maxblockstart-1 % M);
int numblocks = (lastblockstart-1)/M + 1;
vector<int> subBlock;
vector<iniMatrix> block;
for(unsigned i=0; (i < numblocks); i++)
{
for(unsigned j=0; (j < N); j++)
{
subBlock.push_back(theData[(i-1*M+j)]);
block.push_back(subBlock);
}
}
return block;
}
此代码编译,但是,当即便试图输出块的大小,我得到:Segmentation fault:11 ..任何想法?
的数据正通过函数传递是: N = 600 M = 200
我希望有人能帮助我,谢谢:)
你循环不工作?或者你只是想解释Mathlab循环? – MimiEAM 2012-08-16 04:57:27
请解释并且循环不起作用,错误:无法匹配调用'(std :: vector>)(unsigned int)'。谢谢 –
Phorce
2012-08-16 04:59:49
现在我添加了一些关于数组开始索引和matlab和C++ – 2012-08-16 05:07:43