142 lines
2.0 KiB
C++
142 lines
2.0 KiB
C++
//-----------------------------------------------------------------------------
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//
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// Author : philippe.billet@noos.fr
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//
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// Characteristic set function carac(x,a,b)
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//
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//
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//-----------------------------------------------------------------------------
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#include "stdafx.h"
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#include "defs.h"
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static int exp_flag;
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void
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eval_carac(void)
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{
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push(cadr(p1));
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eval();
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push(caddr(p1));
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eval();
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push(cadddr(p1));
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eval();
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carac();
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}
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void
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carac(void)
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{
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save();
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yycarac();
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restore();
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}
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#define X p1
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#define A p2
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#define B p3
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void
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yycarac(void)
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{
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B = pop();
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A = pop();
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X = pop();
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if (isdouble(X) && isdouble(A) && isdouble(B)) {
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if (X->u.d > B->u.d && X->u.d < A->u.d)
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{push_integer(1);
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return;}
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else
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if (X->u.d == B->u.d || X->u.d == A->u.d)
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{push_rational(1, 2);
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return;}
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else
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{push_integer(0);
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return;}
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}
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if (isrational(X) && isrational(A) && isrational(B)) {
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if (MSIGN(msub(mmul(X->u.q.b,A->u.q.a),mmul(X->u.q.a,A->u.q.b))) == -1
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&&
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MSIGN(msub(mmul(X->u.q.a,B->u.q.b),mmul(X->u.q.b,B->u.q.a))) == -1)
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{push_integer(1);
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return;}
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else
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if (MZERO(msub(mmul(X->u.q.b,A->u.q.a),mmul(X->u.q.a,A->u.q.b)))
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||
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MZERO(msub(mmul(X->u.q.a,B->u.q.b),mmul(X->u.q.b,B->u.q.a))))
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{push_rational(1, 2);
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return;}
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else
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{push_integer(0);
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return;}
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}
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if (exp_flag) {
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push(X);
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push_integer(-1);
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push(A);
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multiply();
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add();
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heaviside();
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push(X);
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push_integer(-1);
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push(B);
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multiply();
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add();
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heaviside();
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push_integer(-1);
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multiply();
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add();
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return;
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}
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if (isnegativeterm(X)) {
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push_symbol(CARAC);
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push(X);
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negate();
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push(A);
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push(B);
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list(4);
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return;
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}
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push_symbol(CARAC);
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push(X);
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push(A);
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push(B);
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list(4);
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}
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#if SELFTEST
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static char *s[] = {
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"carac(-2,-1,1)",
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"0",
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"carac(-1,-1,1)",
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"1/2",
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"carac(0,-1,1)",
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"1",
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"carac(1,-1,1)",
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"1/2",
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"carac(2,-1,1)",
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"0",
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};
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void
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test_carac(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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#endif
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