ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Sun, 24 Feb 2013 03:48:41 +0100integral interpretationhttps://ask.sagemath.org/question/9841/integral-interpretation/I found an integral which sage doesn't much seem to like:
var('R, t')
integral(((1/(R*t))*exp(i*R*t)), t)
it returns this: (essentially)
(Ei(iRt))/R
But the two i's should just multiply out and the two R's simplify to 1.
And what's 'E'?
I realize the integral is divergent, and the indefinite serves my purposes, but I'm not quite sure what
Also, if anyone could point me to a thread on how to attach those nifty screenshot-like html images of a sage session (like those used in error reports, i have no idea what the right word is) into a text box like this, that would be be appreciated. Still new to computing.Sun, 24 Feb 2013 01:59:12 +0100https://ask.sagemath.org/question/9841/integral-interpretation/Answer by achrzesz for <p>I found an integral which sage doesn't much seem to like:</p>
<p>var('R, t')
integral(((1/(R<em>t))</em>exp(i<em>R</em>t)), t)
it returns this: (essentially)
(Ei(iRt))/R</p>
<p>But the two i's should just multiply out and the two R's simplify to 1.
And what's 'E'?
I realize the integral is divergent, and the indefinite serves my purposes, but I'm not quite sure what </p>
<p>Also, if anyone could point me to a thread on how to attach those nifty screenshot-like html images of a sage session (like those used in error reports, i have no idea what the right word is) into a text box like this, that would be be appreciated. Still new to computing.</p>
https://ask.sagemath.org/question/9841/integral-interpretation/?answer=14589#post-id-14589Sage gives you the correct answer. You can check it for example in wolframalpha.
Ei
is the exponential integral (and not a product).
To obtain a better formatted code you can copy-paste your code,
mark it and use the 101... icon. Sun, 24 Feb 2013 03:48:41 +0100https://ask.sagemath.org/question/9841/integral-interpretation/?answer=14589#post-id-14589