/usr/include/idas/idas_dense.h is in libsundials-serial-dev 2.5.0-3+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* -----------------------------------------------------------------
* $Revision: 1.7 $
* $Date: 2010/12/01 22:15:15 $
* -----------------------------------------------------------------
* Programmer(s): Alan C. Hindmarsh and Radu Serban @ LLNL
* -----------------------------------------------------------------
* Copyright (c) 2002, The Regents of the University of California.
* Produced at the Lawrence Livermore National Laboratory.
* All rights reserved.
* For details, see the LICENSE file.
* -----------------------------------------------------------------
* This is the header file for the IDADENSE linear solver module.
* -----------------------------------------------------------------
*/
#ifndef _IDASDENSE_H
#define _IDASDENSE_H
#ifdef __cplusplus /* wrapper to enable C++ usage */
extern "C" {
#endif
#include <idas/idas_direct.h>
#include <sundials/sundials_dense.h>
/*
* -----------------------------------------------------------------
* Function : IDADense
* -----------------------------------------------------------------
* A call to the IDADense function links the main integrator
* with the IDADENSE linear solver module.
*
* ida_mem is the pointer to integrator memory returned by
* IDACreate.
*
* Neq is the problem size
*
* IDADense returns:
* IDADLS_SUCCESS = 0 if successful
* IDADLS_LMEM_FAIL = -1 if there was a memory allocation failure
* IDADLS_ILL_INPUT = -2 if NVECTOR found incompatible
*
* NOTE: The dense linear solver assumes a serial implementation
* of the NVECTOR package. Therefore, IDADense will first
* test for a compatible N_Vector internal representation
* by checking that the functions N_VGetArrayPointer and
* N_VSetArrayPointer exist.
* -----------------------------------------------------------------
*/
SUNDIALS_EXPORT int IDADense(void *ida_mem, long int Neq);
/*
* -----------------------------------------------------------------
* Function: IDADenseB
* -----------------------------------------------------------------
* IDADenseB links the main IDAS integrator with the IDADENSE
* linear solver for the backward integration.
* -----------------------------------------------------------------
*/
SUNDIALS_EXPORT int IDADenseB(void *ida_mem, int which, long int NeqB);
#ifdef __cplusplus
}
#endif
#endif
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