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Comments:
<0> hm
<1> the yield statement is basically exactly such a facility, except it returns a generator, and I need a list.
<1> `Cinder`: have you looked at /Dive into Python/?
<0> not yet Oo
<1> diveintopython.com, if I remember right.
<0> i've been looking for a downable version of does Guido's python tutorial
<1> there's also python.org/doc/tut, the excellent brief tutorial.
<1> oh, let's see...
<2> davidmccabe: the yield statement returns the next value in the sequence, not a generator
<0> .org, you were close :P
<1> Loge: well, you know what I mean.
<3> http://sportsbybrooks.com/maui18.jpg z- un cangrejo!
<1> http://docs.python.org/download.html
<3> damn chanel switching
<3> :P
<1> there's your download, `Cinder`.
<3> nevermind that, python rox
<1> ouch. that page hasn't been updated to the new look and feel.
<1> it has broken links, too :(
<0> aw
<0> lol
<1> `Cinder`: the website has just been overhauled. appearently there's some mess yet from that.
<0> icic
<0> well thanks david (and everyone else), i'll be back in a bit just have some reading to do ^^
<4> davidmccabe: what's wrong with list(somegenerator())
<5> anyone know where to look if i want to minimize the value of a function that takes 4 parameters?
<6> emes: What do you mean by "minimize the value of a function"?
<5> f(a,b,c,d) returns a float > 0, i want to find the a,b,c,d that produces the lowest value
<1> I think maybe he means "find the values of the parameters that will yield the lowest return value for the function".
<1> emes: you pull out your old calculus textbook. python is not a CAS.
<2> emes: sniff around http://scipy.org/
<5> davidmccabe: i'm 16, i don't have an old calculus textbook :)
<1> oh, bummer.
<1> emes: do you want to do it for one particular function, or do you want your program to do it for functions in general?
<4> in the general case that's a very hard problem
<6> Why not change the function to take *args, and use min()
<1> TML: reread the question.
<5> aren't there libraries that do this?
<5> i'm not looking to do the calculus
<4> TML: he doesn't want min(a,b,c,d), he wants the best a,b,c,d to get small values for f(a,b,c,d)
<6> davidmccabe: Clearly I missed something. :)
<6> oh
<1> emes: it's an analytic problem. solving it programmatically is extremely hard.
<4> emes: not really, because as I said, it's very difficult in general. If your functions can be restricted (e.g. linear only) it gets much easier
<1> the folks on #math might be of more help.
<1> what kind of function is it?
<5> logistic
<7> is there a way to get the python ini file thingy to not put the things back in the file in random order
<5> well
<5> ((a/(1+b*exp(c*x[i])) + d)-y[i])^2
<5> to be exact
<1> ah, ok.
<1> so it isn't reading from a database or something ;P
<5> i don't care if the computer has to keep cycling for 10 minutes before it finds the answer
<1> oh, so you want to just brute force it?
<2> Monte Carlo sim might be an option
<5> that would work
<1> that's easy, but it comes with no guaranties.
<1> there might be minimums outside of the range of values you test. you can't be sure without doing some algebra on it.
<5> i don't have a range of values to test
<1> if you know the range of reasonable values, then brute force will work.
<5> well, actually i do
<1> is the function continuous?
<5> for a,b and d
<1> but it's not continous for c?
<4> he has ranges for a,b, and d
<4> but not c
<5> c could be a very large number
<1> or you don't have a reasonable range for c?
<1> oh.
<1> if you don't have a range of reasonable numbers, you have to use analysis. a computer (short of something like mathematica which does the analysis for you) can only find it by testing values, but it can't test an infinite number of values.
<4> well, if c is very large, and b is positive, then the function reduces to (d-y[i])^2 which is fairly easy to minimize
<1> what I want to know is whether it's continuous.
<1> what is y[i]?
<4> davidmccabe: for any particular query, a constant, if I'm reading it right
<5> hmm
<1> oh. then it's just a parabola. you can minimize that with high school algebra.
<8> Do you have a lot of different (x,y) pairs that you want to fit simultaneously?
<4> e.g. he has a list of points x,y for which he wants to get minimums a/b/c/d
<5> i should have said that i'm summing from i = 0 to n ((a/(1+b*exp(c*x[i])) + d)-y[i])^2
<1> ahhh.
<4> still, in that case you minimize the terms
<5> where n is the number of data points
<9> hello
<4> so you can treat (i.e. minimize) each data point separately
<5> maybe i should just call up my friend with a TI-89 and ask him to do it :P
<1> nah. you'll learn more if you don't.
<8> WalterMundt, I think he wants to choose one (a,b,c,d) and use the same values for all (x[i], y[i]) pairs... this looks like a chi-squared fit, I think.
<4> heatsink: ahha, possibly true
<8> except it's not normalized.
<1> emes: the people on #math are wonderful.
<5> davidmccabe: problem is I don't have time :(
<10> I just installed FC-4 last night. It only has Python 2.4.1 on it
<10> if only ISO
<10> 's could be updated before you download 'em :)
<5> RadSurfer: try a distribution that starts by installing the latest version :P
<10> I wanted FC-4 I
<10> I've heard lots of good things about it.
<10> Whats the proper procedure of putting scripts in my PATH so they can be launched directly?
<1> put them in your PATH.
<11> RadSurfer, http://www.python.org/download/releases/2.4.3/rpms/ <--- these are actually for 2.4.2, but stay tuned
<11> RadSurfer, sources for 2.4.3: http://www.python.org/download/releases/2.4.3/
<10> thank you.
<12> hm. slashdot.org has gone off the deepend.
<10> now what?
<10> not the dreaded 3 0... yikes
<10> can do without that queer pink
<11> 3 0?
<10> birthday on Slashdot
<10> this is interesting: 1st hd-dvd now on sale.
<10> so glad I'm using Linux again.
<13> Jerub: it's an April Fools joke :)
<13> Jerub: but /. seems like that everyday
<10> wonder if thats true:
<10> " Our marketing department has done extensive research over the last 3 quarters and discovered that our audience is strangely disproportionately skewed towards males. Like, 98.3% males to be precise."
<10> I dont think most males would like their current motif
<14> hey guys
<14> does anyone know of a good curve fit package?
<14> basically, I need something to help me identify changes in trends in data
<15> dweb: http://users.rcn.com/python/download/matfunc.htm
<14> pythy I'll check it out
<13> RadSurfer: what distro you using ?
<15> dweb: "polyfit(points, degree) and ratfit(points, degree) create polynomial and rational polynomial approximations (curve-fits) of the specified degree (defaults to 2) for a given set of x,y values"
<16> I built a python module using swig that uses some minutes to calculate some data. Now I do a wxpython GUI for it. How can I run it as a background process? I think then I could somehow access a global variable from the C function to display a progress bar. Is this possible somehow?
<16> Using daemon() in the C function?
<17> does anybody knows how to do something when I implement copy action in windows?
<14> pythy, how would I know which degree to use?
<15> Personally, I try to avoid the third degree.
<14> pythy, so what's the most likely degree for finding turning points in a trend
<15> "does anybody knows how to do something when I implement copy action" > kode4u: Sure! Just let me know when you implement it, and I can think of several things I can do.
<15> dweb: Try the third degree.
<17> Pythy, I wanna replace `\r\n` in the text which in clipboard to `,`, I'v known how to control clipboard, but I still wanna my python script can keep track of system copy event, so that I do not need to 'copy -> run script -> copy run script...'
<15> kode4u: You can run it in the background, and have it poll the clipboard, looking for text containing any \r\n's
<14> Pythy, ok
<17> Pythy, I'v done that. I just dont know how to do something when I copy something.
<14> what do people use as an ide for windows these days?
<14> I used to be only a linux user
<14> I haven't programmer on windows before...
<14> programmed
<15> I use a bare-bones program called Leo: http://webpages.charter.net/edreamleo/front.html
<17> Pythy, could you help me?
<15> I just did.
<15> Kode4u: Whenever you copy some text containing \r\n's to the clipboard---from any application, not just that Python application---it will be noticed & changed by the Python program.
<17> Pythy, Hmmm, sorry I still can't understand your mean. Could send me some examples or documents?
<15> kode4u: Which part was unclear to you?
<18> i if have a catch all exceptions block, where would i get the type and details of the exception it caught
<15> except ValueError, err_o: print err_o.__cl***__.__name__, err_o, err_.args
<15> except ValueError, err_o: print err_o.__cl***__.__name__, err_o, err_o.args
<17> Pythy, Could you receive my script file? I need to do sth when i copy sth in MS Windows enviroment. You'v given me any advice about the matter?
<15> ?>minipasteit@kode4u
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