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view libcruft/amos/cshch.f @ 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 | 82be108cc558 |
children |
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SUBROUTINE CSHCH(Z, CSH, CCH) C***BEGIN PROLOGUE CSHCH C***REFER TO CBESK,CBESH C C CSHCH COMPUTES THE COMPLEX HYPERBOLIC FUNCTIONS CSH=SINH(X+I*Y) C AND CCH=COSH(X+I*Y), WHERE I**2=-1. C C***ROUTINES CALLED (NONE) C***END PROLOGUE CSHCH COMPLEX CCH, CSH, Z REAL CCHI, CCHR, CH, CN, CSHI, CSHR, SH, SN, X, Y, COSH, SINH X = REAL(Z) Y = AIMAG(Z) SH = SINH(X) CH = COSH(X) SN = SIN(Y) CN = COS(Y) CSHR = SH*CN CSHI = CH*SN CSH = CMPLX(CSHR,CSHI) CCHR = CH*CN CCHI = SH*SN CCH = CMPLX(CCHR,CCHI) RETURN END