integrating with the HP Prime

11122016, 08:35 AM
(This post was last modified: 11122016 08:38 AM by Fanboy.)
Post: #1




integrating with the HP Prime
I'm trying to integrate 'e^(B*x^2) from inf to +inf' with the hp prime emulator. The calculator is not spitting out what I'm looking for which is sqrt(pi/B) and incorrectly gives infinity as the answer.
However, it gives the correct answer (sqrt(pi)) when I just integrate 'e^(x^2) from inf to +inf' (without any letters). If I use a number instead of a letter, then it starts giving out the correct answer again. I'm completely new to the prime (currently have a 50G) so can anyone tell me how to get my answer in terms of the letter? I've posted a pic of the problem here: http://i1226.photobucket.com/albums/ee40...rhavgy.png 

11122016, 10:28 AM
Post: #2




RE: integrating with the HP Prime
You should not use B as parameter, because B is always assigned on the Prime, by default to 0.0, and since exp(B*x^2)=1 if B=0 this explains why the integral is infinity. Try with b instead.


11122016, 11:15 PM
(This post was last modified: 11122016 11:16 PM by Fanboy.)
Post: #3




RE: integrating with the HP Prime
How do we know which letters have a value attached to them like B? I noticed that the letters 'K' and 'A' also gave infinity as the answer.
Also, if I use another letter like b or a, I get the answer as "undef". Its still not working. 

11132016, 12:01 AM
Post: #4




RE: integrating with the HP Prime  
11132016, 12:21 AM
Post: #5




RE: integrating with the HP Prime
Ok, that works. How do I remove that assumption?


11132016, 12:44 AM
Post: #6




RE: integrating with the HP Prime  
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