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  • Netlogo Programming question - Chemical Equilibrium temperature and pressure implementation

    - by user286190
    Hi I am trying to code something in Netlogo..I am using an existing model Chemical Equilibrium and am trying to implement the following: turtles-own [speed ] ask turtles [ ;; set velocity ( ambient-temperature = 30 ) ;; fd velocity if temp > 40 [ "speed" increases of turtles ] ifelse temperature < 30 [ speed of turtles decreases] ] ;; to temp but it does not seem to work (it temperature is more than 40 the speed of the turtles increases if the temperature is less than 30 the speed of the turtles decreases) temperature is a slider on the model the same for pressure ask turtles [ ;; if pressure > 50 then speed increases of turtles ;; if pressure < 50 then speed decreases of turtles ] ;; to pressure thanks

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  • Python datetime not including DST when using pytz timezone

    - by Jesper
    If I convert a UTC datetime to swedish format, summertime is included (CEST). However, while creating a datetime with sweden as the timezone, it gets CET instead of CEST. Why is this? >>> # Modified for readability >>> import pytz >>> import datetime >>> sweden = pytz.timezone('Europe/Stockholm') >>> >>> datetime.datetime(2010, 4, 20, 16, 20, tzinfo=pytz.utc).astimezone(sweden) datetime(2010, 4, 20, 18, 20, tzinfo=<... 'Europe/Stockholm' CEST+2:00:00 DST>) >>> >>> datetime.datetime(2010, 4, 20, 18, 20, tzinfo=sweden) datetime(2010, 4, 20, 18, 20, tzinfo=<... 'Europe/Stockholm' CET+1:00:00 STD>) >>>

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  • Django query: Count and Group BY

    - by Tyler Lane
    I have a query that I'm trying to figure the "django" way of doing it: I want to take the last 100 calls from Call. Which is easy: calls = Call.objects.all().order_by('-call_time')[:100] However the next part I can't find the way to do it via django's ORM. I want to get a list of the call_types and the number of calls each one has WITHIN that previous queryset i just did. Normally i would do a query like this: "SELECT COUNT(id),calltype FROM call WHERE id IN ( SELECT id FROM call ORDER BY call_time DESC LIMIT 100 ) GROUP BY calltype;" I can't seem to find the django way of doing this particular query. Here are my 2 models: class Call( models.Model ): call_time = models.DateTimeField( "Call Time", auto_now = False, auto_now_add = False ) description = models.CharField( max_length = 150 ) response = models.CharField( max_length = 50 ) event_num = models.CharField( max_length = 20 ) report_num = models.CharField( max_length = 20 ) address = models.CharField( max_length = 150 ) zip_code = models.CharField( max_length = 10 ) geom = models.PointField(srid=4326) calltype = models.ForeignKey(CallType) objects = models.GeoManager() class CallType( models.Model ): name = models.CharField( max_length = 50 ) description = models.CharField( max_length = 150 ) active = models.BooleanField() time_init = models.DateTimeField( "Date Added", auto_now = False, auto_now_add = True ) objects = models.Manager()

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  • Using OpenGL Mathematics (GLM) in an Objective-C program

    - by user1621592
    i am trying to use GLM to load a .obj object in my Objective-C Program (Xcode 4.4 Mac Os X). I have added the glm folder to my project. i try to import it using #import "glm/glm.hpp", but the program doesn't build. some of the errors are the following: (this errors are produced in the GLM files) namespace glm{ //Unknown type name 'namespace' namespace detail { ..... it doesn't find the cstdlib, cmath, and other libraries.... This happens because my program is in Objective-c and the GLM doesn't work with this language??? How can i resolve this problem??? Thanks for your help.

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  • Django blog reply system

    - by dana
    hello, i'm trying to build a mini reply system, based on the user's posts on a mini blog. Every post has a link named reply. if one presses reply, the reply form appears, and one edits the reply, and submits the form.The problem is that i don't know how to take the id of the post i want to reply to. In the view, if i use as a parameter one number (as an id of the blog post),it inserts the reply to the database. But how can i do it by not hardcoding? The view is: def save_reply(request): if request.method == 'POST': form = ReplyForm(request.POST) if form.is_valid(): new_obj = form.save(commit=False) new_obj.creator = request.user new_post = New(1) #it works only hardcoded new_obj.reply_to = new_post new_obj.save() return HttpResponseRedirect('.') else: form = ReplyForm() return render_to_response('replies/replies.html', { 'form': form, }, context_instance=RequestContext(request)) i have in forms.py: class ReplyForm(ModelForm): class Meta: model = Reply fields = ['reply'] and in models: class Reply(models.Model): reply_to = models.ForeignKey(New) creator = models.ForeignKey(User) reply = models.CharField(max_length=140,blank=False) objects = NewManager() mentioning that New is the micro blog class thanks

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  • textbox not getting refreshed

    - by oo
    i am doing an ajax call and i refresh a partial view. Inside the partial view i have this: <%=Html.TextBox("instance.Id", Model.Id)%> when i put a breakpoint here over Model.Id it has a number in it but after the ajax refresh is done the textbox just shows up with a 0. When i do a full browser refresh, the correct number shows up in the textbox. when i use firebug to look at data in my callback i see this: <input id="instance_Id" name="instance.Id" type="text" value="0" /> Everything else in the partial view refreshes fine. any ideas on what could be going wrong here?

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  • Python file-io code listing current folder path instead of the specified

    - by Tom Brito
    I have the code: import os import sys fileList = os.listdir(sys.argv[1]) for file in fileList: if os.path.isfile(file): print "File >> " + os.path.abspath(file) else: print "Dir >> " + os.path.abspath(file) Located in my music folder ("/home/tom/Music") When I call it with: python test.py "/tmp" I expected it to list my "/tmp" files and folders with the full path. But it printed lines like: Dir >> /home/tom/Music/seahorse-gw2jNn Dir >> /home/tom/Music/FlashXX9kV847 Dir >> /home/tom/Music/pulse-DcIEoxW5h2gz This is, the correct file names, but the wrong path (and this files are not either in my Music folder).. What's wrong with this code?

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  • "cannot concatenate 'str' and 'list' objects" keeps coming up :(

    - by ratce003
    I'm writing a python program and passing in a html template but an error keeps coming up, "cannot concatenate 'str' and 'list' objects" here is is the program: #!/usr/bin/env python # -*- coding: UTF-8 -*- # enable debugging import cgi import cgitb cgitb.enable() def template(file, **vars): return open(file, 'r').read() % vars print "Content-type: text/html\n" print form = cgi.FieldStorage() # instantiate only once! num_1 = form.getfirst('num_1') num_2 = form.getfirst('num_2') int1r = str(num_1) int2r = str(num_2) def calc_range(int2r, int1r): start = range(int2r, int1r + 1) end = range(1, int2r) return start+end int1 = int(int1r) int2 = int(int2r) out_str = '' for i in range(0, int1): first_line_num = (int2 + i) % int1 if first_line_num == 0: first_line_num = int1 line = calc_range(first_line_num, int1) out_str += line print template('results.html', output=out_str, title="Latin Squares")

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  • Where and which data to save into session on an ASP.NET MVC 2 application?

    - by Shaharyar
    I am having some trouble saving the state of my current view. Currenly I have several selectlist calling their own Action method on the controller that returns the Index view with the filtered model based on the values of the selectlist. I have also written a little FileResult action that creates a csv file based on the current model. But I am only covering one selectlist right now as I only save the value of selectList1 into the session and access it with Session["SelectListValue1"] What are the best practices in this situation? Should I redo the entire (each action for each SelectList) part? Should I save each SelectLists value into the session and check if it's null? Or should I just save the Lambda Expression into the session and modify it during every call?

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  • GAE datastore eager loading in python api

    - by tomus
    I have two models in relation one-to-many: class Question(db.Model): questionText = db.StringProperty(multiline=False) class Answer(db.Model): answerText = db.StringProperty(multiline=False) question = db.ReferenceProperty(Question, collection_name='answers') I have front-end implemented in Flex and use pyamf to load data. When i try to load all answers with related questions all works as desired and I can access field answer.question however in case of loading questions (e.g. by Questions.all() ), 'question.answers' remains empty/null (though on server/python side I can revise question.answers without problem - probably after lazy-loading). So is it possible to load all questions along with answers ? (I know this is possible in JPA Java api but what about python ?) Shoud I use additional setting, GQL query or django framework to make it work ?

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  • Carrier Wave not completing upload to Rackspace Cloud Files

    - by Zack Fernandes
    Hello, I have been attempting to get file uploads to Rackspace Cloud Files online all night, and finally tried the Carrierwave Plugin. Although the plugin worked right away, when I tried viewing the file uploaded (an image) it was broken. Upon further testing, I found out that files would upload to Cloud Files, however were just a fraction of their original size. I can't seem to figure out what's worng, and any help would be greatly appreciated. My code is as follows. models\attachment.rb class Attachment < ActiveRecord::Base attr_accessible :title, :user_id, :file, :remote_file_url, :file_cache, :remove_file belongs_to :user mount_uploader :file, AttachmentUploader end uploaders\attachment_uploader.rb class AttachmentUploader < CarrierWave::Uploader::Base storage :cloud_files def store_dir "#{model.user_id}-#{model.id}" end end

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  • Java: design problem with final-value and empty constructor

    - by HH
    $ javac InitInt.java InitInt.java:7: variable right might not have been initialized InitInt(){} ^ 1 error $ cat InitInt.java import java.util.*; import java.io.*; public class InitInt { private final int right; // Design Problem? // I feel the initialization problem is just due to bad style. InitInt(){} InitInt{ // Still the error, "may not be initialized" // How to initialise it? if(snippetBuilder.length()>(charwisePos+25)){ right=charwisePos+25; }else{ right=snippetBuilder.length()-1; } } public static void main(String[] args) { InitInt test = new InitInt(); System.out.println(test.getRight()); } public int getRight(){return right;} } Partial Solutions and Suggestions use "this" to access methods in the class, instead of creating empty constructor change final to non-final with final field value: initialize all final values in every constructor remove the empty constructor, keep your code simple and clean

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  • how to write re-usable views in django?

    - by rz
    These are the techniques that I use regularly to make my views reusable: take the template_name as an argument with a default take an optional extra_context which defaults to empty {} right before the template is rendered the context is updated with the extra_context for further re-usability, call any callable in extra_context.values() whenever the view deals with a queryset, there is a queryset argument with a default whenever the view needs a particular object from the ORM, it attempts to fetch it using any "id" parameter in several ways (e.g. as a slug, as a database id) (this may be a bad practice...) First, Should I add anything to my list? Should I remove anything from my list? The items accommodates a large number of cases. However, whenever an app extends a model of another in some way (e.g. adding a field or changing the behavior in some way) I end up writing my own views and only reusing the model. Is this normal?

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  • Getting website data into Adobe InDesign

    - by Magnus Smith
    I'd like our magazine team to be able to download website data in a file that Adobe InDesign can read. They can then import/open the file, make a few tweaks, and cut out a vast deal of repetitive manual labour (they currently use copy&paste for a few hours). After a brief Google I note that v2 of InDesign can import/export XML so perhaps that is my best bet? Are there any alternatives, and can anyone offer any advice on them? I am using a PC, and the magazine team are on Macs; testing will be tiresome I fear. The data we wish to format is fairly simple - a title followed by a short chunk of text (repeated about 50 times, say). I'll ask about importing images later. Thanks for your help. I will return to Google now, but it would be great if anyone can point me in a more specific direction first!

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  • Reading correctly alphanumeric fields into R

    - by gd047
    A tab-delimited text file, which is actually an export (using bcp) of a database table, is of that form: 102 1 01 e113c 3224.96 12 102 1 01 e185 101127.25 12 102 2 01 e185 176417.90 12 102A 3 01 e185 26261.03 12 I tried to import it in R with a command like data <- read.delim("C:\\test.txt", header = FALSE, sep = "\t") The problem is that the 3rd column which is actually a varchar field (alphanumeric) is mistakenly read as integer (as there are no letters in the entire column) and the leading zeros disappeared. The same thing happened when I imported the data directly from the database, using odbcConnect. Again that column was read as integer. str(data) $ code: int 1 1 1 1 1 1 6 1 1 8 ... How can I import such a dataset in R correctly, so as to be able to safely populate that db table again, after doing some data manipulations?

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  • What is the best way to handle validity dates in applications ?

    - by user214626
    Hello, How do we model these objects ? Scenario 1: Price changes in a time period EffectiveDate ExpiryDate Price 2009-01-01 2009-01-31 800$ 2009-02-01 Null 900$ So, if the price changes to 910$ on 2009-02-15, then the system should automatically update the expiry date on the previous effective price to 2009-02-14, to keep it consistent. Scenario 2: No price specified between 2009-02-01 to 2009-02-28 EffectiveDate ExpiryDate Price 2009-01-01 2009-01-31 800$ 2009-03-01 Null 900$ So, if new price is specified for 2009-02-15 onwards , then the system should automatically set the expiry date on the record to be inserted to 2009-02-28, because already a record effective from 2009-03-01 exists. Please suggest an effective way to handle these scenarios to model my framework, or are there any frameworks around that can do this . Thanks

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  • How come module-level validation errors only display when property-level validators are Valid?

    - by jonathanconway
    I'm using the module-level validator: 'PropertiesMustMatch' on my view-model, like so: [PropertiesMustMatch("Password", "PasswordConfirm")] public class HomeIndex { [Required] public string Name { get; set; } public string Password { get; set; } public string PasswordConfirm { get; set; } } I'm noticing that if I submit the form without Name filled in, the ValidationSummary() helper returns only the following error: The Name field is required. However, if I fill in Name, then ValidationSummary() will return a PropertiesMustMatch error: 'Password' and 'PasswordConfirm' do not match. So it looks like the property-level validators are being evaluated first, then the model-level validators. I would much prefer if they were all validated at once, and ValidationSummary would return: The Name field is required. 'Password' and 'PasswordConfirm' do not match. Any ideas what I can do to fix this? I'm studying the MVC 2 source-code to try to determine why this happens.

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  • Finding parents where child collection does not contain an item with a specific property value

    - by Colin Bowern
    I am trying to get a list of parents where the child collection does not contain an item of a specific type. The LINQ equivalent would be something like: dataset.Where(x => x.Items.FirstOrDefault(y => y.Type.Code == "ABC") == null) The object model is Parent Child (Items) Type Code If Parent is my aggregate root, how would I model this in NHibernate criteria/query? Here's my first attempt: var results = session.CreateCriteria<Parent>() .CreateCriteria("Items") .CreateCriteria("Type") .Add(Restrictions.Not(Restrictions.Eq("Code", "ABC"))) .SetResultTransformer(Transformers.DistinctRootEntity) .List<Parent>(); This doesn't seem to return the right entities - it just returns them all.

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  • Java compiler error: "cannot find symbol" when trying to access local variable

    - by HH
    $ javac GetAllDirs.java GetAllDirs.java:16: cannot find symbol symbol : variable checkFile location: class GetAllDirs System.out.println(checkFile.getName()); ^ 1 error $ cat GetAllDirs.java import java.util.*; import java.io.*; public class GetAllDirs { public void getAllDirs(File file) { if(file.isDirectory()){ System.out.println(file.getName()); File checkFile = new File(file.getCanonicalPath()); }else if(file.isFile()){ System.out.println(file.getName()); File checkFile = new File(file.getParent()); }else{ // checkFile should get Initialized at least HERE! File checkFile = file; } System.out.println(file.getName()); // WHY ERROR HERE: checkfile not found System.out.println(checkFile.getName()); } public static void main(String[] args) { GetAllDirs dirs = new GetAllDirs(); File current = new File("."); dirs.getAllDirs(current); } }

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  • Java: startingPath as "public static final" exception

    - by HH
    [Updated] Thanks to polygenelubricants's reply, the real problem is the exception from the method getCanonicalPath() because I cannot include try-catch-loop there. $ cat StartingPath.java import java.util.*; import java.io.*; public class StartingPath { public static final String startingPath = (new File(".")).getCanonicalPath(); public static void main(String[] args){ System.out.println(startingPath); } } $ javac StartingPath.java StartingPath.java:5: unreported exception java.io.IOException; must be caught or declared to be thrown public static final String startingPath = (new File(".")).getCanonicalPath(); ^ 1 error

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  • Rest Web Service with App Engine and Webapp

    - by fceruti
    I want to build a REST web service on app engine. Currently i have this: from google.appengine.ext import webapp from google.appengine.ext.webapp import util class UsersHandler(webapp.RequestHandler): def get(self, name): self.response.out.write('Hello '+ name+'!') def main(): util.run_wsgi_app(application) #Map url like /rest/users/johnsmith application = webapp.WSGIApplication([(r'/rest/users/(.*)',UsersHandler)] debug=True) if __name__ == '__main__': main() And i would like to retreive for example all my users when the path /rest/users is accessed. I Imagine I can do this by building another handler, but I want to know if is possible to do it inside of this handler.

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  • MVC Client Validation from Service Layer

    - by GibboK
    I'm following this article http://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-cs to include a Service Layer with Business Logic in my MVC Web Application. I'm able to pass messages from the Service Layer to the View Model in a Html.ValidationSummary using ModelState Class. I perform basic validation logic on the View Model (using DataAnnotation attributes) and I have ClientValidation enabled by default which displaying the error message on every single field of my form. The Business logic error message which come from the Service Layer are being displayed on Html.ValidationSummary only after Posting the form to the Server. After Validation from the Service Layer I would like highlight one or more fields and have the message from the Service Layer showing on these fields instead that the Html.ValidationSummary. Any idea how to do it? Thanks

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  • Spring validation errors not displayed

    - by Art Vandelay
    I have the following situation. I have a validator to validate my command object and set the errors on a Errors object to be displayed in my form. The validator is invoked as expected and works okay, but the errors i set on the Errors objects are not displayed, when i am sent back to my form because of the validation errors. Validator: public void validate(Object obj, Errors err) { MyCommand myCommand = (MyCommand) obj; int index = 0; for (Field field : myCommand.getFields()) { if (field.isChecked()) { if ((field.getValue() == null) || (field.getValue().equals(""))) { err.rejectValue("fields[" + index + "].value", "errors.missing"); } } index++; } if (myCommand.getLimit() < 0) { err.rejectValue("limit", "errors.invalid"); } } Command: public class MyCommand { private List<Field> fields; private int limit; //getters and setters } public class Field { private boolean checked; private String name; private String value; //getters and setters } Form: <form:form id="myForm" method="POST" action="${url}" commandName="myCommand"> <c:forEach items="${myCommand.fields}" var="field" varStatus="status"> <form:checkbox path="fields[${status.index}].checked" value="${field.checked}" /> <c:out value="${field.name}" /> <form:input path="fields[${status.index}].value" /> <form:errors path="fields[${status.index}].value" cssClass="error" /></td> <form:hidden path="fields[${status.index}].name" /> </c:forEach> <fmt:message key="label.limit" /> <form:input path="limit" /> <form:errors path="limit" cssClass="error" /> </form:form> Controller: @RequestMapping(value = REQ_MAPPING, method = RequestMethod.POST) public String onSubmit(Model model, MyCommand myCommand, BindingResult result) { // validate myCommandValidator.validate(myCommand, result); if (result.hasErrors()) { model.addAttribute("myCommand", myCommand); return VIEW; } // form is okay, do stuff and redirect } Could it be that the paths i give in the validator and tag are not correct? The validator validates a command object containing a list of objects, so that's why i give a index on the list in the command object when registering an error message (for example: "fields["+index+"]".value). Or is it that the Errors object containing the errors is not available to my view? Any help is welcome and appreciated, it might give me a hint or point me in right direction.

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  • SSIS Dataflow From Excel Empty Rows

    - by Gerard
    Hi All, I am using SSIS Dataflow to import data into SQL2008. My data source is an excel file. The dataflow is working, however it seems that it is importing empty rows from the Excel file. I don't understand why this is happening. For example i have data in rows 1 to rows 100,000. But when the data flow task runs it might say it is importing 200,000 rows. When I then import the data back into excel, I get 200,000 rows of data with 100,000 empty rows in between the data. Can someone please help? Thanks

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