Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math.symbolic.independent

Topic: error in an integral, Rubi 4.3, QuotientOfLinearsParts error
Replies: 10   Last Post: Dec 9, 2013 5:44 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Nasser Abbasi

Posts: 5,675
Registered: 2/7/05
error in an integral, Rubi 4.3, QuotientOfLinearsParts error
Posted: Nov 29, 2013 8:34 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply


Fyi,

Rubi 4.3, Mathematica 9.02, windows 7

-------------------------
ClearAll[t]
Assuming[t>0,
Int[Sqrt[1+40 t] Sqrt[1+(162 t^2)/(4-2 I Sqrt[77])] Sqrt[1+(162 t^2)/(4+2 I Sqrt[77])],t]
]
------------------------

gives

$RecursionLimit::reclim: Recursion depth of 1024 exceeded. >>
General::stop: Further output of $IterationLimit::itlim will be suppressed during this calculation. >>
QuotientOfLinearsParts error!
Power::infy: Infinite expression 1/0 encountered. >>
Infinity::indet: Indeterminate expression ComplexInfinity+ComplexInfinity encountered. >>

But, using Mathematica own Integrate on same integral, does not give these
errors (but remains unevlauated)

--------------------------------
Assuming[t > 0,
Integrate[
Sqrt[1 + 40 t] Sqrt[1 + (162 t^2)/(4 - 2 I Sqrt[77])] Sqrt[
1 + (162 t^2)/(4 + 2 I Sqrt[77])], t]]
----------------------------------

Also, doing

ShowSteps = True;

did not show any steps for some reason for this integral before the
error showed up. So hard to know which step caused it.

--Nasser



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.