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#include "rb_lapack.h"
extern VOID sspev_(char* jobz, char* uplo, integer* n, real* ap, real* w, real* z, integer* ldz, real* work, integer* info);
static VALUE
rblapack_sspev(int argc, VALUE *argv, VALUE self){
VALUE rblapack_jobz;
char jobz;
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_ap;
real *ap;
VALUE rblapack_w;
real *w;
VALUE rblapack_z;
real *z;
VALUE rblapack_info;
integer info;
VALUE rblapack_ap_out__;
real *ap_out__;
real *work;
integer ldap;
integer n;
integer ldz;
VALUE rblapack_options;
if (argc > 0 && TYPE(argv[argc-1]) == T_HASH) {
argc--;
rblapack_options = argv[argc];
if (rb_hash_aref(rblapack_options, sHelp) == Qtrue) {
printf("%s\n", "USAGE:\n w, z, info, ap = NumRu::Lapack.sspev( jobz, uplo, ap, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE SSPEV( JOBZ, UPLO, N, AP, W, Z, LDZ, WORK, INFO )\n\n* Purpose\n* =======\n*\n* SSPEV computes all the eigenvalues and, optionally, eigenvectors of a\n* real symmetric matrix A in packed storage.\n*\n\n* Arguments\n* =========\n*\n* JOBZ (input) CHARACTER*1\n* = 'N': Compute eigenvalues only;\n* = 'V': Compute eigenvalues and eigenvectors.\n*\n* UPLO (input) CHARACTER*1\n* = 'U': Upper triangle of A is stored;\n* = 'L': Lower triangle of A is stored.\n*\n* N (input) INTEGER\n* The order of the matrix A. N >= 0.\n*\n* AP (input/output) REAL array, dimension (N*(N+1)/2)\n* On entry, the upper or lower triangle of the symmetric matrix\n* A, packed columnwise in a linear array. The j-th column of A\n* is stored in the array AP as follows:\n* if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;\n* if UPLO = 'L', AP(i + (j-1)*(2*n-j)/2) = A(i,j) for j<=i<=n.\n*\n* On exit, AP is overwritten by values generated during the\n* reduction to tridiagonal form. If UPLO = 'U', the diagonal\n* and first superdiagonal of the tridiagonal matrix T overwrite\n* the corresponding elements of A, and if UPLO = 'L', the\n* diagonal and first subdiagonal of T overwrite the\n* corresponding elements of A.\n*\n* W (output) REAL array, dimension (N)\n* If INFO = 0, the eigenvalues in ascending order.\n*\n* Z (output) REAL array, dimension (LDZ, N)\n* If JOBZ = 'V', then if INFO = 0, Z contains the orthonormal\n* eigenvectors of the matrix A, with the i-th column of Z\n* holding the eigenvector associated with W(i).\n* If JOBZ = 'N', then Z is not referenced.\n*\n* LDZ (input) INTEGER\n* The leading dimension of the array Z. LDZ >= 1, and if\n* JOBZ = 'V', LDZ >= max(1,N).\n*\n* WORK (workspace) REAL array, dimension (3*N)\n*\n* INFO (output) INTEGER\n* = 0: successful exit.\n* < 0: if INFO = -i, the i-th argument had an illegal value.\n* > 0: if INFO = i, the algorithm failed to converge; i\n* off-diagonal elements of an intermediate tridiagonal\n* form did not converge to zero.\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n w, z, info, ap = NumRu::Lapack.sspev( jobz, uplo, ap, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 3 && argc != 3)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 3)", argc);
rblapack_jobz = argv[0];
rblapack_uplo = argv[1];
rblapack_ap = argv[2];
if (argc == 3) {
} else if (rblapack_options != Qnil) {
} else {
}
jobz = StringValueCStr(rblapack_jobz)[0];
if (!NA_IsNArray(rblapack_ap))
rb_raise(rb_eArgError, "ap (3th argument) must be NArray");
if (NA_RANK(rblapack_ap) != 1)
rb_raise(rb_eArgError, "rank of ap (3th argument) must be %d", 1);
ldap = NA_SHAPE0(rblapack_ap);
if (NA_TYPE(rblapack_ap) != NA_SFLOAT)
rblapack_ap = na_change_type(rblapack_ap, NA_SFLOAT);
ap = NA_PTR_TYPE(rblapack_ap, real*);
n = ((int)sqrtf(ldap*8+1.0f)-1)/2;
uplo = StringValueCStr(rblapack_uplo)[0];
ldz = lsame_(&jobz,"V") ? MAX(1,n) : 1;
{
na_shape_t shape[1];
shape[0] = n;
rblapack_w = na_make_object(NA_SFLOAT, 1, shape, cNArray);
}
w = NA_PTR_TYPE(rblapack_w, real*);
{
na_shape_t shape[2];
shape[0] = ldz;
shape[1] = n;
rblapack_z = na_make_object(NA_SFLOAT, 2, shape, cNArray);
}
z = NA_PTR_TYPE(rblapack_z, real*);
{
na_shape_t shape[1];
shape[0] = ldap;
rblapack_ap_out__ = na_make_object(NA_SFLOAT, 1, shape, cNArray);
}
ap_out__ = NA_PTR_TYPE(rblapack_ap_out__, real*);
MEMCPY(ap_out__, ap, real, NA_TOTAL(rblapack_ap));
rblapack_ap = rblapack_ap_out__;
ap = ap_out__;
work = ALLOC_N(real, (3*n));
sspev_(&jobz, &uplo, &n, ap, w, z, &ldz, work, &info);
free(work);
rblapack_info = INT2NUM(info);
return rb_ary_new3(4, rblapack_w, rblapack_z, rblapack_info, rblapack_ap);
}
void
init_lapack_sspev(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "sspev", rblapack_sspev, -1);
}
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