7cb8488e_e_vS5__CUDA_5_0__documentation__Description
[Name] residualVector [Type] double* [Description] 
This parameter provides the means for a user to capture the residual at each iteration. The specified array must be at least maxIter in length. This parameter may be NULL if these quantities are not desired.
CULA Sparse Reference Manual — sparse_reference vS5 (CUDA 5.0) documentation
Description