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  • Image processing custom filter 7 by 7

    - by ladiesMan217
    Lets say I have a 7 by 7 neighborhood around a pixel that looks like this 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 and I wanna filter the above by replacing the pixel p by the average of those pixels whose value lie in the range -10<=p_value <=10. I am new to image processing and I think in this case p_value is 25 and around 25 that are many pixel values in that range but don't exactly know to construct a convolution filter out of it.

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  • List filtering: list comprehension vs. lambda + filter

    - by Agos
    I happened to find myself having a basic filtering need: I have a list and I have to filter it by an attribute of the items. My code looked like this: list = [i for i in list if i.attribute == value] But then i thought, wouldn't it be better to write it like this? filter(lambda x: x.attribute == value, list) It's more readable, and if needed for performance the lambda could be taken out to gain something. Question is: are there any caveats in using the second way? Any performance difference? Am I missing the Pythonic Way™ entirely and should do it in yet another way (such as using itemgetter instead of the lambda)? Thanks in advance

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  • filter functions problem

    - by Adam
    I'm working on a search component for an app I'm working on and I needed to add some filters to it. I've found an example and got the first filter working fine. Now I'm trying to add a second filter I'm running into problems... In the example I found they use filterFunctions, but I only get an option for filterFunction, why is that? Here's the example code productsCollection.filterFunctions = [ filterByPrice, filterByType, filterByCondition, filterByVendor ] And this is what I'm trying acData.filterFunction = [filterByStatus, filterByDate] but with this code I get the following error message - 1067: Implicit coercion of a value of type Array to an unrelated type Function. Why am I getting this error and how would I go about add multiple filters to my Array Collection? Thanks!

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  • How do I make "simple" throughput j2ee-filter?

    - by Tommy
    I'm looking to create a filter that can give me two things: number of request pr minute, and average responsetime pr minute. I already got the individual readings, I'm just not sure how to add them up. My filter captures every request, and it records the time each request takes: public void doFilter(ServletRequest request, ...() { long start = System.currentTimeMillis(); chain.doFilter(request, response); long stop = System.currentTimeMillis(); String time = Util.getTimeDifferenceInSec(start, stop); } This information will be used to create some pretty Google Chart charts. I don't want to store the data in any database. Just a way to get current numbers out when requested As this is a high volume application; low overhead is essential. I'm assuming my applicationserver doesn't provide this information.

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  • python equivalent of filter() getting two output lists

    - by FX
    Let's say I have a list, and a filtering function. Using something like >>> filter(lambda x: x > 10, [1,4,12,7,42]) [12, 42] I can get the elements matching the criterion. Is there a function I could use that would output two lists, one of elements matching, one of the remaining elements? I could call the filter() function twice, but that's kinda ugly :) Edit: the order of elements should be conserved, and I may have identical elements multiple times.

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  • Run both Authorize Filter and Action Filter on unauthenticated ASP.NET MVC request

    - by Bryan Migliorisi
    I have decorated my base controller with a couple of action filters. They work fine. One of those filters sets up the request - does things like set the culture based on the domain, etc. I also have a handful of actions that require authorization using the Authorize attribute. My problem is that when an user attempts to request a page they are not authorized to access, the authorization filter kicks in and redirects them to a page telling them that they cannot vie the page. The issue is that the action filters never run so the culture and other request data is never set. This effectively causes language to be wrong in the view and other data to be missing. I know that authorization filters run first but my question is this: How can I design this such that I can ensure that certain methods are always run before the view is returned, regardless of the authorization. Hope that makes sense.

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  • Django Inline formset for editing multiple related records at once - the right way to go?

    - by Bert
    Hi, When using inline formsets, how does one do paging? I'm using django 1.1. The situation I'm in, is that the user needs to be able to edit the related objects quickly and easily (which is why I think I should be using an inline formset). However, there can be a more than a hundred objects to edit, which makes a pretty large formset, so paging would make sense. Is there a better way to be doing this? Thanks Bert

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  • How do you set the sitemap priority for flatpages in django?

    - by mlissner
    I have a site with about 60,000 pages that are getting placed in the sitemap, and which have a priority of 0.3. These are all really long pages that are rich in keywords. I also have a few pages (like the about page), that need high priority, but which I've implemented with the django flatpages framework. Is it possible for pages created this way to have a higher priority in the sitemap?

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  • Why isn't django-nose running the doctests in my models?

    - by Conley Owens
    I'm trying to use doctests with django-nose. All my doctests are running, except not any doctests within a model (unless it is abstract). class TestModel1(models.Model): """ >>> print 'pass' pass """ pass class TestModel2(models.Model): """ >>> print 'pass' pass """ class Meta: abstract = True pass The first doctest does not run and the second does. Why is this?

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  • PHP filter_var() - FILTER_VALIDATE_URL

    - by Alix Axel
    The FILTER_VALIDATE_URL filter seems to have some trouble validating non-ASCII URLs: var_dump(filter_var('http://pt.wikipedia.org/wiki/', FILTER_VALIDATE_URL)); // http://pt.wikipedia.org/wiki/ var_dump(filter_var('http://pt.wikipedia.org/wiki/Guimarães', FILTER_VALIDATE_URL)); // false Why isn't the last URL correctly validated? And what are the possible workarounds? Running PHP 5.3.0. I'd also like to know where I can find the source code of the FILTER_VALIDATE_URL validation filter.

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  • Django: Setting up database code tables (aka reference tables, domain tables)?

    - by User
    Often times applications will need some database code tables (aka reference tables or domain tables or lookup tables). Suppose I have a model class called Status with a field called name that could hold values like: Canceled Pending InProgress Complete Where and at what point would I setup these values in Django? Its like a one time operation to setup these values in the database. Infrequently, these values could be added to.

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  • Where does the creation of permissions live in Django?

    - by lazerscience
    I need to do some debugging, because the permissions for one of my models are created wrongly. So I tried to find the piece of code where Django creates the permissions upon syncdb and writes them in the database, but I haven't been successful at all; maybe I just overlooked the right lines of code, but if somebody can point me out the right module / line of code where this happens I'd be very happy!

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  • Django Model: many-to-many or many-to-one?

    - by knuckfubuck
    I'm just learning django and following a tutorial. I have a Link and a Bookmark. Unlike the tutorial I'm following, I would like a link to be associated with only one Bookmark, but a Bookmark can have multiple links. Is this the way to setup the model? class Link(models.Model): url = models.URLField(unique=True) bookmark = models.ForeignKey(Bookmark) class Bookmark(models.Model): title = models.CharField(maxlength=200) user = models.ForeignKey(User) links = models.ManyToManyField(Link)

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  • What is a good sample solrconfig.xml for django-haystack?

    - by Danner
    I am building out a solr instance for django, but the example provided from solr is super verbose, with many things that are not relevant to haystack. A sample with spelling suggestions, morelikethis, and faceting, without the extra stuff that haystack doesn't use would go a long way to helping me understand what is needed and what isn't.

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  • How do I get Phusion Passenger to work with Django for App Engine?

    - by Mike
    I'm having a devil of a time getting Phusion Passenger to work with django-nonrel for Google's App Engine. I can seem to get it to work for GoogleAppEngineLauncher and for the production server but not Passenger; or for Passenger and GoogleAppEngineLauncher but not the production server; or for Passenger and the production server but not GoogleAppEngineLauncher. How do I get my app to deploy on all three?

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  • How to add django-db-log models to admin panel?

    - by Enchantner
    Just installed django-db-log module and trying to make it work properly. 'python manage.py syncdb' command created databases, it seems like logging works, but there is nothing about it in admin panel. As I found in documentation, it should add itself in admin panel without any additional configuration, but then I added 'djangodblog.middleware.DBLogMiddleware' in MIDDLEWARE_CLASSES and 'djangodblog' in INSTALLED_APPS it looks like nothing happens. What I'm doing wrong?

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