[Ipopt] Warning: Cutting back alpha due to evaluation error

[Andreas Waechter]

Hi Mehmet,

It means that either an evaluation method returned false, or that a Nan 
(Not a Number) or Inf (Infinity) floating point values appeared in the 
function or gradient values.  This can happen if you take the log of a 
negative number or divide by zero.

Regards

Andreas

On Sat, 7 Aug 2010, Mehmet Saglam wrote:

> Hello,
>
> If we get the following warning in iterations, "Warning: Cutting back alpha
> due to evaluation error," does that necessarily mean that our
> implementations is wrong? If not, why do we get such a warning message?
>
> Best,
> Mehmet
>