[GiNaC-list] Problem: Floating point overflow

[Chris Dams]

Dear Alexei,

On Thu, 29 Mar 2007, Sheplyakov Alexei wrote:

> > Yes, but not from a string. In normal code you can type
> > 
> > sin(sin(sin(sin(log(-0.760).hold()))))
> 
> I used to think that GiNaC does not evaluate expressions numerically
> unless evalf() is called. Apparently this is not true. I think this
> is a bug which should be fixed.

I do not see a problem with it. I think it is almost always the right
thing to do. This behaviour was intended as is clear from this code
fragment from exp_eval

// exp(float) -> float
if (x.info(info_flags::numeric) && !x.info(info_flags::crational))
	return exp(ex_to<numeric>(x));

I am afraid that changing this behaviour would break quite a lot of code
out there.

Best wishes,
Chris