mpcomplex operator-(const mpcomplex& a, const long int& b) {
mpc_t value;
mpc_init3( value , a.mpc_prec, a.mpc_prec );
mpc_sub_ui(value, a.mpc_val, b, a.default_rnd);
return mpcomplex(value);
}
SEXP R_mpc_sub(SEXP e1, SEXP e2) {
mpc_t *z = (mpc_t *)malloc(sizeof(mpc_t));
if (z == NULL) {
Rf_error("Could not allocate memory for MPC type.");
}
if (Rf_inherits(e1, "mpc")) {
Rprintf("It's an mpc");
mpc_t *z1 = (mpc_t *)R_ExternalPtrAddr(e1);
if (Rf_inherits(e2, "mpc")) {
mpc_t *z2 = (mpc_t *)R_ExternalPtrAddr(e2);
mpc_init2(*z, max(mpc_get_prec(*z1),
mpc_get_prec(*z2)));
mpc_sub(*z, *z1, *z2, Rmpc_get_rounding());
} else if (Rf_isInteger(e2)) {
mpc_init2(*z, mpc_get_prec(*z1));
mpc_sub_ui(*z, *z1, INTEGER(e2)[0],
Rmpc_get_rounding());
} else if (Rf_isNumeric(e2)) {
mpfr_t x;
mpfr_init2(x, 53);
mpfr_set_d(x, REAL(e2)[0], GMP_RNDN);
Rprintf("Precision: %d\n", mpc_get_prec(*z1));
mpc_init2(*z, max(mpc_get_prec(*z1), 53));
mpc_sub_fr(*z, *z1, x, Rmpc_get_rounding());
} else {
Rf_error("Unsupported type for operand 2 of MPC subtraction.");
}
} else if (Rf_isInteger(e1)) {
if (Rf_inherits(e2, "mpc")) {
mpc_t *z2 = (mpc_t *)R_ExternalPtrAddr(e2);
mpc_init2(*z, mpc_get_prec(*z2));
mpc_ui_sub(*z, INTEGER(e1)[0], *z2,
Rmpc_get_rounding());
} else {
Rf_error("Unsupported type for operands for MPC subtraction.");
}
} else if (Rf_isNumeric(e1)) {
if (Rf_inherits(e2, "mpc")) {
mpc_t *z2 = (mpc_t *)R_ExternalPtrAddr(e2);
mpc_init2(*z, mpc_get_prec(*z2));
mpfr_t x;
mpfr_init2(x, 53);
mpfr_set_d(x, REAL(e1)[0], GMP_RNDN);
mpc_fr_sub(*z, x, *z2, Rmpc_get_rounding());
} else {
Rf_error("Unsupported type for operands for MPC subtraction.");
}
} else {
/* TODO(mstokely): Add support for mpfr types here. */
Rprintf("It's unknown");
free(z);
Rf_error("Invalid second operand for mpc subtraction.");
}
SEXP retVal = PROTECT(R_MakeExternalPtr((void *)z,
Rf_install("mpc ptr"), R_NilValue));
Rf_setAttrib(retVal, R_ClassSymbol, Rf_mkString("mpc"));
R_RegisterCFinalizerEx(retVal, mpcFinalizer, TRUE);
UNPROTECT(1);
return retVal;
}
void Lib_Mpcr_Sub_Ui(MpcrPtr f, MpcrPtr g, unsigned int x, long rnd)
{
mpc_sub_ui( (mpc_ptr) f, (mpc_ptr) g, x, (mpc_rnd_t) rnd);
}