From 61a028914d6e684ee50d5d32f3bdcdc7ec5f0cc0 Mon Sep 17 00:00:00 2001 From: "Vladimir V. Kisil" Date: Tue, 14 May 2019 13:11:13 +0100 Subject: [PATCH 2/3] Additional examples on number conversions. Some aspects of these methods are not obvious for newbies. Signed-off-by: Vladimir V. Kisil --- doc/tutorial/ginac.texi | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/doc/tutorial/ginac.texi b/doc/tutorial/ginac.texi index bc4b87fc..65ca5918 100644 --- a/doc/tutorial/ginac.texi +++ b/doc/tutorial/ginac.texi @@ -1533,6 +1533,15 @@ rational number will return a floating-point approximation. Both @code{to_int()/to_long()} and @code{to_double()} discard the imaginary part of complex numbers. +Note the signature of the above methods, you may need to apply a type +conversion and call @code{evalf()} as shown in the following example: +@example + ... + ex e1 = 1, e2 = sin(Pi/5); + cout << ex_to(e1).to_int() << endl + << ex_to(e2.evalf()).to_double() << endl; + ... +@end example @node Constants, Fundamental containers, Numbers, Basic concepts @c node-name, next, previous, up -- 2.20.1