看到一篇文章,这里的L是什么意思,不明白,求指点!(这么不能放图片?)
We make use of the Gram-Schmidt process which makes each step as fast as the first one
when M ⪢ n (i.e. the number of SNPs is much greater the number individuals). At each step
we obtain the QR-decomposition of the cofactor matrix to obtain the L matrix and use it to
calculate the marginal inverse variance matrix
<bblatex>M^(-1/2) = (I - L^'L)'V^(-1/2)</bblatex>