title: Sparse matrix in R using library irlba
body: <p>I have large data in my database. I have to create a matrix has size 600.000x20.000 or like that, but many of cells will be empty. How can I use this R programming language to create my matrix or by using singular value decomposition(SVD) methods? I do not know using in language R and I'll use the sparse matrix in Java programming? I am so confused...</p>