NaN message?

04082016, 08:32 PM
Post: #1




NaN message?
I am trying to integrate the function f(x)=ln(2+sin(x)) from x=3 to 5 and I get NaN message.
Can someone tell me why? 

04082016, 09:58 PM
Post: #2




RE: NaN message?
I get a complex answer in CAS, an invalid input message in HOME. Physical software version 7820, and same behavior on iPad emulator.


04082016, 10:31 PM
Post: #3




RE: NaN message?
(04082016 08:32 PM)Tim O Wrote: I am trying to integrate the function f(x)=ln(2+sin(x)) from x=3 to 5 and I get NaN message. Try this: ∫(ln(2+sin(x)),x,3.0,5) Note the 3 is typed 3.0 not just 3 Then you get about 0.555 for an approx answer. It's an approx/exact issue. road 

04092016, 02:03 AM
Post: #4




RE: NaN message?
Hi!, all:
If configure HP PRIME, for CAS and in CAS Setting in Approximate mode, Standar mode with 12 digits, the result is ... 0.555085197181 In Plot, if any value, of function is <=0, the result is NaN (Not an Number). See, the attachment's in HP PRIME and Wolfram Alpha. 

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