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#include "rb_lapack.h"
extern VOID dlapll_(integer* n, doublereal* x, integer* incx, doublereal* y, integer* incy, doublereal* ssmin);
static VALUE
rblapack_dlapll(int argc, VALUE *argv, VALUE self){
VALUE rblapack_n;
integer n;
VALUE rblapack_x;
doublereal *x;
VALUE rblapack_incx;
integer incx;
VALUE rblapack_y;
doublereal *y;
VALUE rblapack_incy;
integer incy;
VALUE rblapack_ssmin;
doublereal ssmin;
VALUE rblapack_x_out__;
doublereal *x_out__;
VALUE rblapack_y_out__;
doublereal *y_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 ssmin, x, y = NumRu::Lapack.dlapll( n, x, incx, y, incy, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE DLAPLL( N, X, INCX, Y, INCY, SSMIN )\n\n* Purpose\n* =======\n*\n* Given two column vectors X and Y, let\n*\n* A = ( X Y ).\n*\n* The subroutine first computes the QR factorization of A = Q*R,\n* and then computes the SVD of the 2-by-2 upper triangular matrix R.\n* The smaller singular value of R is returned in SSMIN, which is used\n* as the measurement of the linear dependency of the vectors X and Y.\n*\n\n* Arguments\n* =========\n*\n* N (input) INTEGER\n* The length of the vectors X and Y.\n*\n* X (input/output) DOUBLE PRECISION array,\n* dimension (1+(N-1)*INCX)\n* On entry, X contains the N-vector X.\n* On exit, X is overwritten.\n*\n* INCX (input) INTEGER\n* The increment between successive elements of X. INCX > 0.\n*\n* Y (input/output) DOUBLE PRECISION array,\n* dimension (1+(N-1)*INCY)\n* On entry, Y contains the N-vector Y.\n* On exit, Y is overwritten.\n*\n* INCY (input) INTEGER\n* The increment between successive elements of Y. INCY > 0.\n*\n* SSMIN (output) DOUBLE PRECISION\n* The smallest singular value of the N-by-2 matrix A = ( X Y ).\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n ssmin, x, y = NumRu::Lapack.dlapll( n, x, incx, y, incy, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 5 && argc != 5)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 5)", argc);
rblapack_n = argv[0];
rblapack_x = argv[1];
rblapack_incx = argv[2];
rblapack_y = argv[3];
rblapack_incy = argv[4];
if (argc == 5) {
} else if (rblapack_options != Qnil) {
} else {
}
n = NUM2INT(rblapack_n);
incx = NUM2INT(rblapack_incx);
incy = NUM2INT(rblapack_incy);
if (!NA_IsNArray(rblapack_x))
rb_raise(rb_eArgError, "x (2th argument) must be NArray");
if (NA_RANK(rblapack_x) != 1)
rb_raise(rb_eArgError, "rank of x (2th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_x) != (1+(n-1)*incx))
rb_raise(rb_eRuntimeError, "shape 0 of x must be %d", 1+(n-1)*incx);
if (NA_TYPE(rblapack_x) != NA_DFLOAT)
rblapack_x = na_change_type(rblapack_x, NA_DFLOAT);
x = NA_PTR_TYPE(rblapack_x, doublereal*);
if (!NA_IsNArray(rblapack_y))
rb_raise(rb_eArgError, "y (4th argument) must be NArray");
if (NA_RANK(rblapack_y) != 1)
rb_raise(rb_eArgError, "rank of y (4th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_y) != (1+(n-1)*incy))
rb_raise(rb_eRuntimeError, "shape 0 of y must be %d", 1+(n-1)*incy);
if (NA_TYPE(rblapack_y) != NA_DFLOAT)
rblapack_y = na_change_type(rblapack_y, NA_DFLOAT);
y = NA_PTR_TYPE(rblapack_y, doublereal*);
{
na_shape_t shape[1];
shape[0] = 1+(n-1)*incx;
rblapack_x_out__ = na_make_object(NA_DFLOAT, 1, shape, cNArray);
}
x_out__ = NA_PTR_TYPE(rblapack_x_out__, doublereal*);
MEMCPY(x_out__, x, doublereal, NA_TOTAL(rblapack_x));
rblapack_x = rblapack_x_out__;
x = x_out__;
{
na_shape_t shape[1];
shape[0] = 1+(n-1)*incy;
rblapack_y_out__ = na_make_object(NA_DFLOAT, 1, shape, cNArray);
}
y_out__ = NA_PTR_TYPE(rblapack_y_out__, doublereal*);
MEMCPY(y_out__, y, doublereal, NA_TOTAL(rblapack_y));
rblapack_y = rblapack_y_out__;
y = y_out__;
dlapll_(&n, x, &incx, y, &incy, &ssmin);
rblapack_ssmin = rb_float_new((double)ssmin);
return rb_ary_new3(3, rblapack_ssmin, rblapack_x, rblapack_y);
}
void
init_lapack_dlapll(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "dlapll", rblapack_dlapll, -1);
}
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