#2561 limit(log(x^2),x,-20) gives 2*log(-20)

None
closed
Dan Gildea
limit (6)
5
2013-03-12
2013-03-09
Jean-Yves
No

Hi,

limit(log(x^2),x,-20) gives 2*log(-20). This logarithm transformation happens regardless of the value of logexpand. On the other hand, tlimit(log(x^2),x,-20) gives log(400) which looks a more reasonable value. Build_info is build_info("5.28.0-2","2012-08-27 23:16:48","i686-pc-mingw32","GNU Common Lisp (GCL)","GCL 2.6.8").

Best regards,

Jean-Yves

Discussion

  • Dan Gildea
    Dan Gildea
    2013-03-12

    Fixed in limit.lisp - still need to set logexpand:false;

     
  • Dan Gildea
    Dan Gildea
    2013-03-12

    • labels: --> limit
    • status: open --> closed
    • assigned_to: Dan Gildea