An XCas question....
10-14-2017, 06:58 AM
Post: #1
 webmasterpdx Senior Member Posts: 541 Joined: Sep 2015
An XCas question....
I notice that the HP Prime CAS and XCas behave similarly (obviously) towards the following integral....
integrate(e^(-a*x),x,0,+infinity)
in that it only gives a defined answer if you run assume(RE(a)>0) beforehand, as 1/a result.

However, if using Mathematica (Wolfram Alpha) when you give it the problem:

integrate(e^(-a*x),x,0,infiinity)

it gives the result as 1/a for RE(a)>0

i.e. It figures out the conditions for a defined answer and presents them. I don't have to figure out that I need to use +infinity or RE(a)>0. The CAS system figures out the boundaries, instead of me having to know them in advance. The Wolfram Alpha system is a better system in that respect.
I'm wondering is it a big deal for it to figure that out...i.e. I'd love for our CAS system to behave that way....

Here is what I'm talking about...
http://www.wolframalpha.com/input/?i=int...,infinity)

Thx
-Donald
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 Messages In This Thread An XCas question.... - webmasterpdx - 10-14-2017 06:58 AM RE: An XCas question.... - DrD - 10-14-2017, 10:25 AM RE: An XCas question.... - webmasterpdx - 10-14-2017, 10:42 AM RE: An XCas question.... - DrD - 10-14-2017, 10:53 AM RE: An XCas question.... - webmasterpdx - 10-14-2017, 01:55 PM RE: An XCas question.... - DrD - 10-14-2017, 03:03 PM RE: An XCas question.... - StephenG1CMZ - 10-14-2017, 03:41 PM RE: An XCas question.... - webmasterpdx - 10-14-2017, 03:35 PM RE: An XCas question.... - compsystems - 10-14-2017, 06:46 PM RE: An XCas question.... - parisse - 10-15-2017, 06:35 AM RE: An XCas question.... - webmasterpdx - 10-15-2017, 07:26 AM RE: An XCas question.... - DrD - 10-15-2017, 10:50 AM RE: An XCas question.... - webmasterpdx - 10-15-2017, 11:11 AM RE: An XCas question.... - parisse - 10-15-2017, 07:02 PM RE: An XCas question.... - DrD - 10-15-2017, 01:31 PM RE: An XCas question.... - Arno K - 10-15-2017, 01:43 PM RE: An XCas question.... - DrD - 10-15-2017, 02:10 PM RE: An XCas question.... - DrD - 10-15-2017, 03:02 PM RE: An XCas question.... - Arno K - 10-15-2017, 04:00 PM RE: An XCas question.... - DrD - 10-15-2017, 04:44 PM RE: An XCas question.... - Arno K - 10-15-2017, 05:23 PM

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