This is what you can try:
Try to understand what ra ja ia are. Then have a way to transform
x to a dense matrix..
Hope this helps
Chih-Jen
※ 引述《Daniellu (我真的好愛好愛妳)》之銘言：
: How to deal with the content of read.matrix.csr() ??
: In order to use the decision tree, the input should be data frame.
: How to get the information from read.matrix.csr() ??
: (There are "ra", "ja", "ia", "dimension" in $x
: Targets are in $y)