Help with imaginary number output from CAS

06152014, 11:35 PM
(This post was last modified: 06152014 11:41 PM by Rich.)
Post: #1




Help with imaginary number output from CAS
Hi, when "complex" option in the CAS settings is checked, I am getting a "_x" in the output. Is this the correct result and should interpret this as something significant?
I think this was seen in an another error earlier but I am unsure if this is what should be expect when having this setting checked. I have attached a screenshot that has both results, the first with the "complex" checked and the second with it off. Thanks if anyone knows the answer. 

06162014, 03:00 AM
(This post was last modified: 06162014 03:04 AM by Helge Gabert.)
Post: #2




RE: Help with imaginary number output from CAS
I have noticed that same "_x" returned with a couple of expressions to be solved as well.
While I don't know why it shows up (maybe someone from the HP team knows more), what helped me in those cases was to specify an interval for the solver (e.g., x=2 .. 2 instead of just x), which returns the solution [1 1] without any problems (with "complex" checked). [edit: in your case that would be w = 2 . . 2]. 

06162014, 09:31 AM
Post: #3




RE: Help with imaginary number output from CAS
(06152014 11:35 PM)Rich Wrote: Hi, when "complex" option in the CAS settings is checked, I am getting a "_x" in the output. Is this the correct result and should interpret this as something significant? My guess: _x is a free real variable. In other words, for any real value of _x there are two roots for w, given by those two complex expressions. Nigel (UK) 

06172014, 06:32 AM
Post: #4




RE: Help with imaginary number output from CAS
Thank you, I was able to complete my function with the suggestion of a very wide interval, though I later returned and just made an assumption that w was in the domain of a real integer.
For any future reference, this was the command assume(w, DOM_INT). 

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