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14:14 <r420r> hi
14:14 <r420r> how i can do that in maxima?
14:14 <lindi-> what?
14:14 <r420r> x^x^x^x..... = y
14:14 <r420r> just like that?
14:14 <r420r> lindi-, ?
14:16 <r420r> i dont try maxima before
14:17 <r420r> my friend says maxima is very good prob
14:17 <r420r> i want try it
14:18 <lindi-> r420r: i'm not sure what you want to do
14:18 <r420r> how i can discripe it
14:18 <lindi-> "x^x^x=y;" is valid equation yes
14:18 <r420r> x^x^x^.... = 2
14:18 <r420r> like that
14:18 <lindi-> and you want to solve x?
14:18 <r420r> yea
14:18 <r420r> like that
14:19 <lindi-> i'm not sure if maxima can do that
14:19 <r420r> it acn be about limit
14:19 <r420r> it can be about limit
14:20 <r420r> lindi-, 
14:20 <lindi-> simple solve(x^x=4, [x]); doesn't find solution
14:20 <r420r> hmm
14:22 <lindi-> load("mnewton");
14:22 <lindi-> mnewton([x^x=4], [x], [1]);
14:22 <lindi-> [[x = 2.0]]
14:23 <lindi-> but newton's method finds numerical solutions, maxima is really for symbolic stuff
14:23 <r420r> hmm
14:23 <lindi-> (%i5) mnewton([x^x^x=2], [x], [1]);
14:23 <lindi-> (%o5)                      [[x = 1.47668433735787]]
14:24 <r420r> (%i4) mnewton([x^x^x=2], [x], [1]);
14:24 <r420r>                                     x
14:24 <r420r>                                    x
14:24 <r420r> (%o4)                    mnewton([x   = 2], [x], [1])
14:24 <r420r> (%i5) 
14:24 <r420r> maybe i need compile maxima again
14:24 <lindi-> r420r: you forgot load
14:25 <lindi-> 15:22:45 < lindi-> load("mnewton");
14:25 <cunzhang> lindi-: how do you find it?
14:25 <cunzhang> so great!
14:25 <lindi-> cunzhang: find what? describe("newton");
14:26 <cunzhang> lindi-: why you know there is a package mnewton which can do this?
14:26 <lindi-> apparently newton is some simpler version
14:26 <lindi-> cunzhang: since describe("newton") listed it on my etch machine
14:26 <r420r> (%i6) load("mnewton");
14:26 <r420r> (%o6)         /usr/share/maxima/5.13.0/share/contrib/mnewton.mac
14:26 <r420r> (%i7) mnewton([x^x^x=2], [x], [1]);
14:26 <r420r> (%o7)                      [[x = 1.47668433735787]]
14:26 <r420r> (%i8) 
14:26 <lindi-> (%i15) describe("newton");
14:26 <lindi->  0: (maxima.info)mnewton.
14:26 <lindi->  1: Definitions for mnewton.
14:26 <lindi->  2: mnewton :Definitions for mnewton.
14:27 <lindi-> cunzhang: and newton's method is what they teach at math courses :)
14:27 <r420r> (%i8)  mnewton([x^x^x^x^x^x^x^x^x^x^x^x^x=2], [x], [1]);
14:27 <r420r> Maxima encountered a Lisp error:
14:27 <r420r>  Error during processing of --eval option "(cl-user::run)":
14:27 <r420r>   arithmetic error FLOATING-POINT-OVERFLOW signalled
14:27 <r420r> lol
14:27 <cunzhang> lindi-: I mean if there is a problem,you want to use Maxima to solve it,how do you find the answer?
14:28 <lindi-> cunzhang: i don't think there is a general algorithm for that :)
14:28 <lindi-> r420r: mnewton([x^x^x^x^x^x^x^x^x^x^x^x^x=2], [x], [1.4]);
14:28 <lindi-> (%o21)                     [[x = 1.414827508131564]]
14:28 <cunzhang> :)
14:28 <lindi-> r420r: maxima is really not for numerical stuff
14:28 <r420r> hmm
14:29 <lindi-> r420r: but if you give it a better guess it will converge before floats run out
14:29 <r420r> it is working at analatic?
14:29 <r420r> yea
14:29 <lindi-> r420r: newton's method is numerical
14:29 <r420r> how i can do float?
14:29 <lindi-> hmm?
14:29 <r420r> or double?
14:29 <r420r> i was use octave and C
14:29 <lindi-> r420r: octave is for numerical stuff
14:30 <r420r> ahh
14:30 <r420r> ok
14:30 <lindi-> r420r: use it if you want to do numerical stuff :)
14:30 <r420r> ok
14:30 <cunzhang> Scilab and Octave,which do better?
14:30 <lindi-> scilab is non-free, i haven't tried it
14:31 <lindi-> cunzhang: octave probably does better with numeric stuff definitely
14:31 <r420r> warning: meaning may have changed due to change in associativity for ^ operator
14:32 <r420r> octave says that
14:32 <r420r> lol
14:32 <lindi-> r420r: ^ is probably not the right operator in octave
14:32 <lindi-> **
14:33 <r420r> octave:2> 2^2
14:33 <r420r> ans = 4
14:33 <r420r> octave:3> 
14:33 <r420r> why ?
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14:36 <lindi-> r420r: ah, both work i guess
14:36 <lindi-> r420r: help "^"
14:37 <r420r> hmm
14:37 <r420r> hmm
14:37 <r420r> 'x^x'
14:37 <r420r> like that?
14:40 <lindi-> octave?
14:45 <cunzhang> I find a great site which have a book 《Introduction to Dynamical Systems: A Hands-on Approach with Maxima 》,but it is written with Polish,just 2 chapters translated to ENglish :(
14:45 <cunzhang> http://fisica.fe.up.pt/maxima/dynamicalsystems/index.html
14:46 <lindi-> i don't know polish either :/
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14:57 <r420r> a=inline('x_n = sqrt(2)^{x_(n-1)}');
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15:31 -!- cunzhang changed topic to "Maxima: An open source symbolic math system. News: Maxima 5.14.0 released. Logs available at http://rerun.lefant.net/~harald/maximalogs/"
15:31 <cunzhang> :)
16:52 <cunzhang> 
ACTION install Octave to know more about it

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