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+--- Thread: error in laplace (/thread-1716.html)
error in laplace - Alberto Candel - 06-26-2014 05:30 AM
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).
RE: error in laplace - Helge Gabert - 06-27-2014 09:00 PM
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).
RE: error in laplace - Alberto Candel - 06-27-2014 10:00 PM
(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.
RE: error in laplace - Alberto Candel - 06-27-2014 10:05 PM
My bad. It looks like I had an "s" variable in CAS. After removing it, I get the answer, after going through a warning.