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#include "rb_lapack.h"
extern VOID srscl_(integer* n, real* sa, real* sx, integer* incx);
static VALUE
rblapack_srscl(int argc, VALUE *argv, VALUE self){
VALUE rblapack_n;
integer n;
VALUE rblapack_sa;
real sa;
VALUE rblapack_sx;
real *sx;
VALUE rblapack_incx;
integer incx;
VALUE rblapack_sx_out__;
real *sx_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 sx = NumRu::Lapack.srscl( n, sa, sx, incx, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE SRSCL( N, SA, SX, INCX )\n\n* Purpose\n* =======\n*\n* SRSCL multiplies an n-element real vector x by the real scalar 1/a.\n* This is done without overflow or underflow as long as\n* the final result x/a does not overflow or underflow.\n*\n\n* Arguments\n* =========\n*\n* N (input) INTEGER\n* The number of components of the vector x.\n*\n* SA (input) REAL\n* The scalar a which is used to divide each component of x.\n* SA must be >= 0, or the subroutine will divide by zero.\n*\n* SX (input/output) REAL array, dimension\n* (1+(N-1)*abs(INCX))\n* The n-element vector x.\n*\n* INCX (input) INTEGER\n* The increment between successive values of the vector SX.\n* > 0: SX(1) = X(1) and SX(1+(i-1)*INCX) = x(i), 1< i<= n\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n sx = NumRu::Lapack.srscl( n, sa, sx, incx, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 4 && argc != 4)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 4)", argc);
rblapack_n = argv[0];
rblapack_sa = argv[1];
rblapack_sx = argv[2];
rblapack_incx = argv[3];
if (argc == 4) {
} else if (rblapack_options != Qnil) {
} else {
}
n = NUM2INT(rblapack_n);
incx = NUM2INT(rblapack_incx);
sa = (real)NUM2DBL(rblapack_sa);
if (!NA_IsNArray(rblapack_sx))
rb_raise(rb_eArgError, "sx (3th argument) must be NArray");
if (NA_RANK(rblapack_sx) != 1)
rb_raise(rb_eArgError, "rank of sx (3th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_sx) != (1+(n-1)*abs(incx)))
rb_raise(rb_eRuntimeError, "shape 0 of sx must be %d", 1+(n-1)*abs(incx));
if (NA_TYPE(rblapack_sx) != NA_SFLOAT)
rblapack_sx = na_change_type(rblapack_sx, NA_SFLOAT);
sx = NA_PTR_TYPE(rblapack_sx, real*);
{
na_shape_t shape[1];
shape[0] = 1+(n-1)*abs(incx);
rblapack_sx_out__ = na_make_object(NA_SFLOAT, 1, shape, cNArray);
}
sx_out__ = NA_PTR_TYPE(rblapack_sx_out__, real*);
MEMCPY(sx_out__, sx, real, NA_TOTAL(rblapack_sx));
rblapack_sx = rblapack_sx_out__;
sx = sx_out__;
srscl_(&n, &sa, sx, &incx);
return rblapack_sx;
}
void
init_lapack_srscl(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "srscl", rblapack_srscl, -1);
}
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