Dimension permutation and reshaping

[gongx030]

Hi @zamorarr ,

I just came across to the tensorr package and think this will be an important complementary to existing R packages for manipulating the sparse matrix such as Matrix.

However, two important functions.

(1) dimension permutation (e.g. aperm for regular array in R, or transpose in python's numpy ), and (2) dimension reshaping (e.g. dim <- for regular array, or reshape in python's numpy).

Do you have a plan to implement them, or do you realize that there other R packages that are able to handle the sparse array easily?

Thanks for your nice work.

Wuming