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#include "rb_lapack.h"
extern VOID zpptrf_(char* uplo, integer* n, doublecomplex* ap, integer* info);
static VALUE
rblapack_zpptrf(int argc, VALUE *argv, VALUE self){
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_n;
integer n;
VALUE rblapack_ap;
doublecomplex *ap;
VALUE rblapack_info;
integer info;
VALUE rblapack_ap_out__;
doublecomplex *ap_out__;
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 info, ap = NumRu::Lapack.zpptrf( uplo, n, ap, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE ZPPTRF( UPLO, N, AP, INFO )\n\n* Purpose\n* =======\n*\n* ZPPTRF computes the Cholesky factorization of a complex Hermitian\n* positive definite matrix A stored in packed format.\n*\n* The factorization has the form\n* A = U**H * U, if UPLO = 'U', or\n* A = L * L**H, if UPLO = 'L',\n* where U is an upper triangular matrix and L is lower triangular.\n*\n\n* Arguments\n* =========\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) COMPLEX*16 array, dimension (N*(N+1)/2)\n* On entry, the upper or lower triangle of the Hermitian 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)*(2n-j)/2) = A(i,j) for j<=i<=n.\n* See below for further details.\n*\n* On exit, if INFO = 0, the triangular factor U or L from the\n* Cholesky factorization A = U**H*U or A = L*L**H, in the same\n* storage format as A.\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 leading minor of order i is not\n* positive definite, and the factorization could not be\n* completed.\n*\n\n* Further Details\n* ===============\n*\n* The packed storage scheme is illustrated by the following example\n* when N = 4, UPLO = 'U':\n*\n* Two-dimensional storage of the Hermitian matrix A:\n*\n* a11 a12 a13 a14\n* a22 a23 a24\n* a33 a34 (aij = conjg(aji))\n* a44\n*\n* Packed storage of the upper triangle of A:\n*\n* AP = [ a11, a12, a22, a13, a23, a33, a14, a24, a34, a44 ]\n*\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n info, ap = NumRu::Lapack.zpptrf( uplo, n, 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_uplo = argv[0];
rblapack_n = argv[1];
rblapack_ap = argv[2];
if (argc == 3) {
} else if (rblapack_options != Qnil) {
} else {
}
uplo = StringValueCStr(rblapack_uplo)[0];
n = NUM2INT(rblapack_n);
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);
if (NA_SHAPE0(rblapack_ap) != (n*(n+1)/2))
rb_raise(rb_eRuntimeError, "shape 0 of ap must be %d", n*(n+1)/2);
if (NA_TYPE(rblapack_ap) != NA_DCOMPLEX)
rblapack_ap = na_change_type(rblapack_ap, NA_DCOMPLEX);
ap = NA_PTR_TYPE(rblapack_ap, doublecomplex*);
{
na_shape_t shape[1];
shape[0] = n*(n+1)/2;
rblapack_ap_out__ = na_make_object(NA_DCOMPLEX, 1, shape, cNArray);
}
ap_out__ = NA_PTR_TYPE(rblapack_ap_out__, doublecomplex*);
MEMCPY(ap_out__, ap, doublecomplex, NA_TOTAL(rblapack_ap));
rblapack_ap = rblapack_ap_out__;
ap = ap_out__;
zpptrf_(&uplo, &n, ap, &info);
rblapack_info = INT2NUM(info);
return rb_ary_new3(2, rblapack_info, rblapack_ap);
}
void
init_lapack_zpptrf(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "zpptrf", rblapack_zpptrf, -1);
}
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