NEWS
sparsediff 0.6.1 (2026-10-06)
- The bundled SparseDiffEngine moves from 0.3.0 to 0.6.1, the release that
'sparsediffpy' 0.6.x and 'CVXPY' 1.9.3 use. From this release on, the package
version matches the bundled engine version.
- Fixed: a parametric problem re-evaluated after
sd_update_params() could
return values computed from the old parameter values (engine fix #107). For a
modeling layer this meant that re-solving a parametric nonlinear problem
after changing a parameter returned the previous solution, reported as
optimal.
- Fixed: selecting entries with repeated indices in
sd_index() (for example a
quadratic objective over a symmetric variable) could crash R with a bus error
when the Jacobian or Hessian was evaluated (engine fix #105).
- New
sd_quad_form_dense(): the quadratic form with a dense constant or
parametric matrix. The parametric form follows sd_update_params().
sd_quad_form() keeps its signature and still takes a sparse constant matrix.
- Every 'sparsediffpy' 0.6.1 function now has an
sd_* counterpart that calls
the same engine routine with the same arguments; the name map is on the
package help page (?sparsediff). New: sd_left_kron() and
sd_right_kron() (Kronecker products, used by the next CVXPY release), the
compressed-sparse-row derivative accessors sd_jacobian(),
sd_get_jacobian(), sd_init_hessian(), sd_hessian() and
sd_get_hessian(), and sd_get_expr_dimensions() / sd_get_expr_size().
sd_rel_entr() now dispatches on operand size like make_rel_entr.
- Fixed:
sd_init_hessian_coo() crashed R when called before the Jacobian was
initialized; it now initializes the Jacobian first.
sd_rel_entr(), sd_rel_entr_first_scalar() and sd_rel_entr_second_scalar()
now check that their arguments are two different variables, which the
engine requires; other arguments overflowed a heap buffer (found with
AddressSanitizer).- The BLAS shim gains
cblas_ddot, which the 0.6.1 engine calls.
- Fixed: the package failed to compile on Linux systems with glibc 2.36 or
older (for example Debian 12), because
_GNU_SOURCE was defined too late for
fopencookie(). It is now set on the compiler command line.
- Documentation: the sparse matrix arguments of
sd_quad_form() and
sd_left_matmul() / sd_right_matmul() are compressed-sparse-row arrays,
and the dense data arguments are row-major. Earlier documentation said
compressed-sparse-column and column-major. The grouped help pages now have
usage sections (flagged by current R-devel).
- The package now has a 'testthat' test suite.
sparsediff 0.4.0 (2026-06-08)
- First CRAN release, bundling SparseDiffEngine 0.3.0.