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  • How to find minimum of nonlinear, multivariate function using Newton's method (code not linear algeb

    - by Norman Ramsey
    I'm trying to do some parameter estimation and want to choose parameter estimates that minimize the square error in a predicted equation over about 30 variables. If the equation were linear, I would just compute the 30 partial derivatives, set them all to zero, and use a linear-equation solver. But unfortunately the equation is nonlinear and so are its derivatives. If the equation were over a single variable, I would just use Newton's method (also known as Newton-Raphson). The Web is rich in examples and code to implement Newton's method for functions of a single variable. Given that I have about 30 variables, how can I program a numeric solution to this problem using Newton's method? I have the equation in closed form and can compute the first and second derivatives, but I don't know quite how to proceed from there. I have found a large number of treatments on the web, but they quickly get into heavy matrix notation. I've found something moderately helpful on Wikipedia, but I'm having trouble translating it into code. Where I'm worried about breaking down is in the matrix algebra and matrix inversions. I can invert a matrix with a linear-equation solver but I'm worried about getting the right rows and columns, avoiding transposition errors, and so on. To be quite concrete: I want to work with tables mapping variables to their values. I can write a function of such a table that returns the square error given such a table as argument. I can also create functions that return a partial derivative with respect to any given variable. I have a reasonable starting estimate for the values in the table, so I'm not worried about convergence. I'm not sure how to write the loop that uses an estimate (table of value for each variable), the function, and a table of partial-derivative functions to produce a new estimate. That last is what I'd like help with. Any direct help or pointers to good sources will be warmly appreciated. Edit: Since I have the first and second derivatives in closed form, I would like to take advantage of them and avoid more slowly converging methods like simplex searches.

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  • Django User model, adding function

    - by Hellnar
    Hello, I want to add a new function to the default User model of Django for retrieveing a related list of Model type. Such Foo model: class Foo(models.Model): owner = models.ForeignKey(User, related_name="owner") likes = models.ForeignKey(User, related_name="likes") ........ #at some view user = request.user foos= user.get_related_foo_models() Hwo can this be achieved ?

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  • Warning: fsockopen() [function.fsockopen]: unable to connect to

    - by mohanraj
    Domain name: textbox check box .com submit Warning: fsockopen() [function.fsockopen]: unable to connect to whois.crsnic.net:43 (A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ) in C:\xampp\htdocs\check domain.php on line 35 Fatal error: Maximum execution time of 60 seconds exceeded in C:\xampp\htdocs\check domain.php on line 35

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  • Ruby on Rails function grapher

    - by Hock
    Hi, I'm looking for a function grapher that I can use in a small Rails application I'm working on for my university. Is there anything out there? If it needs the values (points) is not a problem but it would be better if it just parsed the equation. The functions will be 100% in ruby format (for example Math.exp(3*x))... Thanks a lot! Nicolás Hock

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  • 'object' undeclared <first use in this function>

    - by Mohit Deshpande
    I am using Winchain to develop on my Windows 7 machine. Here is my code: iPhoneTest.h #import <Foundation/Foundation.h> #import <UIKit/UIKit.h> @interface iPhoneTest : UIApplication { UITextView *textview; UIView *mainView; } @end iPhoneTest.m #import "iPhoneTest.h" #import <UIKit/UIKit.h> #import <Foundation/Foundation.h> #import <CoreFoundation/CoreFoundation.h> @implementation iPhoneTest -(void)applicationDidFinishLaunching:(id)unused { UIWindow *window; struct CGRect rect = [UIHardware fullScreenApplicationContentRect]; rect.origin.x = rect.origin.y = 0.0f; window = [[UIWindow alloc] initWithContentRect: rect]; mainView = [[UIView alloc] initWithFrame: rect]; textView = [[UITextView alloc] init]; [textView setEditable:YES]; [textView setTextSize:14]; [window orderFront: self]; [window makeKey: self]; [window _setHidden: NO]; [window setContentView: mainView]; [mainView addSubview:textView]; [textView setText:@"Hello World"]; } @end main.m #import <Foundation/Foundation.h> #import <UIKit/UIKit.h> #import "iPhoneTest.h" int main(int argc, char *argv[]) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; int ret = UIApplicationMain(argc, argv, [iPhoneTest class]); [pool release]; return ret; } Makefile INFOPLIST_FILE=Info.plist SOURCES=\ main.m \ iPhoneTest.m CC=/usr/local/bin/arm-apple-darwin-gcc CFLAGS=-g -O2 -Wall LD=$(CC) LDFLAGS=-lobjc -framework CoreFoundation -framework Foundation -framework UIKit -framework LayerKit PRODUCT_NAME=iPhoneTest SRCROOT=/iphone-apps/iPhoneTest WRAPPER_NAME=$(PRODUCT_NAME).app EXECUTABLE_NAME=$(PRODUCT_NAME) SOURCES_ABS=$(addprefix $(SRCROOT)/,$(SOURCES)) INFOPLIST_ABS=$(addprefix $(SRCROOT)/,$(INFOPLIST_FILE)) OBJECTS=\ $(patsubst %.c,%.o,$(filter %.c,$(SOURCES))) \ $(patsubst %.cc,%.o,$(filter %.cc,$(SOURCES))) \ $(patsubst %.cpp,%.o,$(filter %.cpp,$(SOURCES))) \ $(patsubst %.m,%.o,$(filter %.m,$(SOURCES))) \ $(patsubst %.mm,%.o,$(filter %.mm,$(SOURCES))) OBJECTS_ABS=$(addprefix $(CONFIGURATION_TEMP_DIR)/,$(OBJECTS)) APP_ABS=$(BUILT_PRODUCTS_DIR)/$(WRAPPER_NAME) PRODUCT_ABS=$(APP_ABS)/$(EXECUTABLE_NAME) all: $(PRODUCT_ABS) $(PRODUCT_ABS): $(APP_ABS) $(OBJECTS_ABS) $(LD) $(LDFLAGS) -o $(PRODUCT_ABS) $(OBJECTS_ABS) $(APP_ABS): $(INFOPLIST_ABS) mkdir -p $(APP_ABS) cp $(INFOPLIST_ABS) $(APP_ABS)/ $(CONFIGURATION_TEMP_DIR)/%.o: $(SRCROOT)/%.m mkdir -p $(dir $@) $(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@ clean: echo rm -f $(OBJECTS_ABS) echo rm -rf $(APP_ABS) When I try to compile it with make, I get iPhoneTest.m: In fucntion '-[iPhoneTest applicationDidFinishLaunching:]' iPhoneTest.m:15: error: 'testView' undeclared <first use in this function> iPhoneTest.m:15: error: <Each undeclared identifier is reported only once for each function it appears in> Can anyone spot the problem?

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  • Function within echo problem

    - by user74283
    Hi, I have a slight problem with the echo statement outputting wrongly. Forexample when i do echo "<div id=\"twitarea\">" . fetchtwitter($rss) . "</div>"; it displays function output but OUTSIDE of twitarea div. What is the cause of this behavior perhaps syntax? thanks in advance

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  • Boost Python - Limits to the number of arguments when wrapping a function

    - by Derek
    I'm using Boost Python to wrap some C++ functions that I've created. One of my C++ functions contains 22 arguments. Boost complains when I try to compile my solution with this function, and I'm trying to figure out if it is just because this function has too many arguments. Does anyone know if such a limit exists? I've copied the error I'm getting below, not the code because I figure someone either knows the answer to this or not - and if there is no limit then I'll just try to figure it out myself. Thanks very much in advance! Here is a copy of the beginning of the error message I receive... 1>main.cpp 1>c:\cpp_ext\boost\boost_1_47\boost\python\make_function.hpp(76): error C2780: 'boost::mpl::vector17<RT,most_derived<Target,ClassT>::type&,T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14> boost::python::detail::get_signature(RT (__thiscall ClassT::* )(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14) volatile const,Target *)' : expects 2 arguments - 1 provided 1>c:\cpp_ext\boost\boost_1_47\boost\python\signature.hpp(236) : see declaration of 'boost::python::detail::get_signature' And eventually I get about a hundred copies of error messages very much resembling this one: 1>c:\cpp_ext\boost\boost_1_47\boost\python\make_function.hpp(76): error C2784: 'boost::mpl::vector17<RT,ClassT&,T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14> boost::python::detail::get_signature(RT (__thiscall ClassT::* )(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14) volatile const)' : could not deduce template argument for 'RT (__thiscall ClassT::* )(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14) volatile const' from 'std::string (__cdecl *)(const std::string &,jal::date::JULIAN_DATE,const std::string &,const std::string &,int,const std::string &,const std::string &,const std::string &,const std::string &,const std::string &,const std::string &,int,const std::string &,const std::string &,int,const std::string &,const std::string &,const std::string &,const std::string &,const std::string &,int,const std::string &)' 1> c:\cpp_ext\boost\boost_1_47\boost\python\signature.hpp(218) : see declaration of 'boost::python::detail::get_signature' 1>c:\cpp_ext\boost\boost_1_47\boost\python\make_function.hpp(76): error C2780: 'boost::mpl::vector17<RT,most_derived<Target,ClassT>::type&,T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14> boost::python::detail::get_signature(RT (__thiscall ClassT::* )(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14) volatile,Target *)' : expects 2 arguments - 1 provided 1> c:\cpp_ext\boost\boost_1_47\boost\python\signature.hpp(236) : see declaration of 'boost::python::detail::get_signature'

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  • showmodaldialog function in ie8

    - by naweli
    i have written a showmodaldialog() fuction in a jsp file and its working well in firefox but in ie8 its now working,my code is here : <-----a.jsp------ <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"% Step Editor function test() { var retvalue; retvalue = window.showModalDialog("index.jsp"); } <--------- in the above code a.jsp is parent window which is calling index.jsp as child window. <----index.jsp-----

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  • In python, changing MySQL query based on function variables

    - by ensnare
    I'd like to be able to add a restriction to the query if user_id != None ... for example: "AND user_id = 5" but I am not sure how to add this into the below function? Thank you. def get(id, user_id=None): query = """SELECT * FROM USERS WHERE text LIKE %s AND id = %s """ values = (search_text, id) results = DB.get(query, values) This way I can call: get(5) get(5,103524234) (contains user_id restriction)

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  • <plugin> not a function

    - by bah
    Hi, I've been trying to solve this mystery almost 2 hours, this is giving me a headache. I tried 2 plug-ins already and I'm always getting "* is not a function". My code is exactly like examples so I don't know why it's not working. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>asd</title> <script type="text/javascript" src="jquery.js"></script> <script type='text/javascript' src='serial/jquery.scrollTo'></script> <script type='text/javascript' src='serial/jquery.serialScroll'></script> <script type="text/javascript"> $(document).ready(function(){ $('#slider').serialScroll({ items:'li', offset:-230, //when scrolling to photo, stop 230 before reaching it (from the left) start:1, //as we are centering it, start at the 2nd duration:1200, force:true, stop:true, lock:false, cycle:false, //don't pull back once you reach the end easing:'easeOutQuart', //use this easing equation for a funny effect jump: true //click on the images to scroll to them }); }); </script> </head> <body> <div id="slider"> <ul> <li><img width="500" height="500" src="dummy/dummy.jpg" alt="Css Template Preview" /></li> <li><img width="500" height="500" src="dummy/dummy1.jpg" alt="Css Template Preview" /></li> <li><img width="500" height="500" src="dummy/dummy2.jpg" alt="Css Template Preview" /></li> <li><img width="500" height="500" src="dummy/dummy3.jpg" alt="Css Template Preview" /></li> </ul> </div> </body> </html> I must be missing something essential there because I see nothing what's wrong. I'm using jQuery 1.4.2. and there are plug-ins I've tried - Easy Slider, jQuery serial scroll

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  • reverse this function

    - by ooo
    i have code that takes a csharp datetime and converts it into a long to plot in the "flot" graph. here is the code public static long GetJavascriptTimestamp(DateTime input) { TimeSpan span = new TimeSpan(DateTime.Parse("1/1/1970").Ticks); DateTime time = input.Subtract(span); return (long)(time.Ticks / 10000); } I now need an opposite function where i take this long value and get the csharp datetime object back. any idea if the above method can be reversed ?

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  • passing multiple vectors to function by reference (using structure)

    - by madman
    Hi StackOverflow, Can someone tell me the correct way of passing multiple vectors to a function that can take only a single argument? (specifically for pthread_create (..) function) I tried the following but it does not seem to work :-( First, I created the following structure struct ip2 { void* obj; int dim; int n_s; vector<vector<vector<double> > > *wlist; vector<int> *nrsv; struct model *pModel; }; The threads that I have created actually needs all these parameters. Since im using pthreads_create I put all this in a structure and then passed the pointer to the structure as an argument to pthread_create (as shown). some_fxn() { //some code struct ip2 ip; ip.obj=(void*) this; ip.n_s=n_s; ip.wlist=&wlist; ip.nrsv=&nrsv; ip.pModel=pModel; ip.dim=dim; pthread_create(&callThd1[lcntr], &attr1, &Cls::Entry, (void*) &ip); } The Entry method looks something like this. void* Cls::Entry(void *ip) { struct ip2 *x; x = (struct ip2 *)ip; (reinterpret_cast<Cls1 *>(x->obj))->Run(x->dim,x->n_s, x->wlist, x->nrsv, x->pModel); } The Run method looks something like this. void Run(int dim, int n_c, vector<vector<vector<double> > > *wlist, vector<int> *nrsv, struct model* pModel ) { //some code for(int k = 0; k < n_c; ++k) { //some code end = index + nrsv[k]; //some code } I get the following error when I try to compile the program. error: no match for ‘operator+’ in ‘index + *(((std::vector<int, std::allocator<int> >*)(((unsigned int)k) * 12u)) + nrsv)’ Can someone tell me how to do it the right way. Madhavan

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  • Method/function overrides in Codeigniter

    - by pingu
    Hi guys, I want to override the validation_errors() method of the form helper in CodeIgniter for one controller only, so that it will display a single error message (as a sentence in plain english) instead of the detailed line item summary. I've tried defining a validation_errors() function in my controller, which is what I usually do with Silverstripe's Sapphire framework, but this won't with CI. What's the best way to override methods for a case by case basis?

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  • jQuery user intput to control option of one jquery function

    - by Tristan
    Hello, i'd like an input to control that : jQuery.ajax({ type: "get", dataType: "jsonp", url: "http://www.foo.com/something.php", data: {numberInput: "NUMER I WANT TO CONTROL" }, On the HTML side i've <input type="text id="jqueryControl" /> I want when a user enters a number ito the jqueryControl to insert it in the .ajax function and reload the data according to the new value entered. Any idea to do that please ? Thanks

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