From da2ce481c6a4c5f79e3c2d888bbab45b9a476bd4 Mon Sep 17 00:00:00 2001 From: Christian Bauer Date: Thu, 28 Feb 2002 17:53:32 +0000 Subject: [PATCH] added some checks for subs() behavior --- check/exam_misc.cpp | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/check/exam_misc.cpp b/check/exam_misc.cpp index 5613b375..849dc5ad 100644 --- a/check/exam_misc.cpp +++ b/check/exam_misc.cpp @@ -199,6 +199,33 @@ static unsigned exam_operator_semantics(void) return result; } +/* This checks whether subs() works as intended in some special cases. */ +static unsigned exam_subs(void) +{ + unsigned result = 0; + symbol x("x"); + ex e1, e2; + + // This used to fail in GiNaC 1.0.5 because it first substituted + // x+1 -> (x-1)+1 -> x, and then substituted again x -> x-1, giving + // the wrong result + e1 = x+1; + e2 = e1.subs(x == x-1); + if (!e2.is_equal(x)) { + clog << "(x+1).subs(x==x-1) erroneously returned " << e2 << " instead of x" << endl; + ++result; + } + + e1 = sin(1+sin(x)); + e2 = e1.subs(sin(wild()) == cos(wild())); + if (!e2.is_equal(cos(1+cos(x)))) { + clog << "sin(1+sin(x)).subs(sin(\$1)==cos(\$1)) erroneously returned " << e2 << " instead of cos(1+cos(x))" << endl; + ++result; + } + + return result; +} + unsigned exam_misc(void) { unsigned result = 0; @@ -211,6 +238,7 @@ unsigned exam_misc(void) result += exam_expand_power(); cout << '.' << flush; result += exam_sqrfree(); cout << '.' << flush; result += exam_operator_semantics(); cout << '.' << flush; + result += exam_subs(); cout << '.' << flush; if (!result) { cout << " passed " << endl; -- 2.35.3