[Maxima-bugs] [ maxima-Bugs-1631930 ] integrate(t^(-1.2),t);

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Bugs item #1631930, was opened at 2007-01-09 20:42
Message generated for change (Comment added) made by rtoy
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: integrate(t^(-1.2),t);

Initial Comment:
integrate(t^(-1.2),t);
gives 

                              5.000000000000001     
                             - -----------------
                                       0.2
                                      t

must be


                                      5
                             - -----------------
                                       0.2
                                      t

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>Comment By: Raymond Toy (rtoy)
Date: 2007-01-10 12:46

Message:
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Originator: NO

Good point.  I would consider this a bug in the definite integration
routines.

At the very least, it should warn about converting a float to a rational.



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Comment By: Nobody/Anonymous (nobody)
Date: 2007-01-10 01:31

Message:
Logged In: NO 

But
integrate(t^(-1.2),t,t1,t2); ("positive" for all questions)
gives true
                                    5       5
                                 ----- - -----
                                  1/5     1/5
                                 t1      t2

This is a bug or feature?

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Comment By: Raymond Toy (rtoy)
Date: 2007-01-09 21:09

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Originator: NO

No.  Compare with 1/(-1.2+1) -> 5.000000000000001

If you wanted the exact number -6/5, you should have said so instead of
using the floating point number 1.2.

Setting status to pending.


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