F06ETF (DAXPYI) adds a scaled sparse real vector, stored in compressed form, to an unscaled real vector.
F06ETF (DAXPYI) performs the operation
is a sparse real vector, stored in compressed form, and
is a real vector in full storage form.
Dodson D S, Grimes R G and Lewis J G (1991) Sparse extensions to the Fortran basic linear algebra subprograms ACM Trans. Math. Software 17 253–263