For a matrix `A`, the [documentation](http://docs.nvidia.com/cuda/cublas/index.html#topic_9_1) only states that the corresponding leading dimension parameter `lda` refers to the:

> 
> leading dimension of two-dimensional array used to store the matrix A
> 
> 
> 

Thus I presume this is just the number of rows of `A` given CUBLAS' column major storage format. **However, when we consider `Op(A)`, what does the leading dimension refer to now?**