error in laplace

[Alberto Candel]

hi,
something is wrong with the laplace function in the CAS. One of the examples in the Help menu is laplace(sin(x)^2,x,s) and my Prime returns Error: Bad argument Value.
Other examples are weirder. For instance, laplace(sin(x)) returns 1/(1+x^2) but before that, a warning shows reading: Unable to check if antiderivative e^... ( some strange charecters).

[Helge Gabert]

Alberto,

Something must be messed up with your settings.

laplace(sin(x)^2,x,s) returns 2/(s^3+4*s) for me; certainly no error message.

Regarding the warnings, just ignore and press enter - - I believe that Bernard Parisse has indicated he would remove warnings which can be safely ignored anyway (at least in Xcas - - whether that will make it into the Prime is another matter).

[Alberto Candel]

(06-27-2014 09:00 PM)Helge Gabert Wrote:  Alberto,

Something must be messed up with your settings.

laplace(sin(x)^2,x,s) returns 2/(s^3+4*s) for me; certainly no error message.

Regarding the warnings, just ignore and press enter - - I believe that Bernard Parisse has indicated he would remove warnings which can be safely ignored anyway (at least in Xcas - - whether that will make it into the Prime is another matter).

Well, we have the same settings I believe, but I still get that error.

[Alberto Candel]

My bad. It looks like I had an "s" variable in CAS. After removing it, I get the answer, after going through a warning.