Mercurial > octave-libgccjit
view liboctave/DET.h @ 8964:f4f4d65faaa0
Implement sparse * diagonal and diagonal * sparse operations, double-prec only.
Date: Sun, 8 Mar 2009 16:28:18 -0400
These preserve sparsity, so eye(5) * sprand (5, 5, .2) is *sparse*
and not dense. This may affect people who use multiplication by
eye() rather than full().
The liboctave routines do *not* check if arguments are scalars in
disguise. There is a type problem with checking at that level. I
suspect we want diag * "sparse scalar" to stay diagonal, but we have
to return a sparse matrix at the liboctave. Rather than worrying
about that in liboctave, we cope with it when binding to Octave and
return the correct higher-level type.
The implementation is in Sparse-diag-op-defs.h rather than
Sparse-op-defs.h to limit recompilation. And the implementations
are templates rather than macros to produce better compiler errors
and debugging information.
author | Jason Riedy <jason@acm.org> |
---|---|
date | Mon, 09 Mar 2009 17:49:13 -0400 |
parents | 9813c07ca946 |
children | 3c1762c7e787 |
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/* Copyright (C) 2008 Jaroslav Hajek This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ #if !defined (octave_DET_h) #define octave_DET_h 1 #include <cmath> #include "oct-cmplx.h" #include "lo-mappers.h" template <class T> class OCTAVE_API base_det { public: base_det (T c = 1, int e = 0) { c2 = xlog2 (c, e2); e2 += e; } base_det (T c, double e, double b) { e *= xlog2 (b); e2 = e; c *= xexp2 (e - e2); int f; c2 = xlog2 (c, f); e2 += f; } base_det (const base_det& a) : c2(a.c2), e2(a.e2) { } base_det& operator = (const base_det& a) { c2 = a.c2; e2 = a.e2; return *this; } T coef (void) const { return c2; } int exp (void) const { return e2; } T value () const { return c2 * static_cast<T> (std::ldexp (1.0, e2)); } operator T () const { return value (); } base_det square () const { return base_det (c2*c2, e2+e2); } void operator *= (T t) { int e; c2 *= xlog2 (t, e); e2 += e; } private: T c2; int e2; }; // Provide the old types by typedefs. typedef base_det<double> DET; typedef base_det<float> FloatDET; typedef base_det<Complex> ComplexDET; typedef base_det<FloatComplex> FloatComplexDET; #endif