Help for a "Surface and Flux integrals" program
|
11-04-2017, 10:38 AM
(This post was last modified: 11-04-2017 10:48 AM by salvomic.)
Post: #15
|
|||
|
|||
RE: Help for a "Surface and Flux integrals" program
(11-04-2017 10:21 AM)AlexFekken Wrote: Hi Salvo, It's true, Alex! the correct input is, therefor: sfint(1,[u*COS(v),u*SIN(v), u^2],[0,1],[0,2π]) that gives (1/6)*(√5*5*π-π) = 5.3304135, and simplifying we have the same result with (π/6)*(5^(3/2)-1) as in the book (that's correct!) This fact induce me to think that we should find a way to help user with the changes of coordinates too... EDIT: add: But, if the result now correspond a that of the book, why in the Prime, doing this integral \( \int_{\sigma }1dS=\iint\sqrt{4u^2+4v^2+1}dudv=\int_{0}^{1}\int_{0}^{2\pi }\rho \sqrt{1+4\rho ^2}d \rho d\theta = \frac{\pi }{6} (5^\frac{3}{2}-1) \) we get a different result? Am I wrong with its input? or the book's example is not so clear... Salvo ∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C - DM42, DM41X - WP34s Prime Soft. Lib |
|||
« Next Oldest | Next Newest »
|
User(s) browsing this thread: 2 Guest(s)