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Is there an MD5 Fixed Point where md5(x) == x?
Is there a fixed point in the MD5 transformation, i.e. does there exist x such that md5(x) == x ?
7 Answers
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Mean per group in a data.frame [duplicate]
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This type of operation is exactly what aggregate was designed for:
d <- read.table(text=
'Name Month Rate1 Rate2
Aira 1 12 23
Aira 2 18 73
Aira 3 19 45
Ben 1 53 19
Be...
Where is the WPF Numeric UpDown control?
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Simply use the IntegerUpDown control in the xtended wpf toolkit
You can use it like this:
Add to your XAML the following namespace:
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
In your XAML where you want the control use:
<xctk:IntegerUpDown Name="myUp...
Change priorityQueue to max priorityqueue
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You can use lambda expression since Java 8.
The following code will print 10, the larger.
// There is overflow problem when using simple lambda as comparator, as pointed out by Фима Гирин.
// PriorityQueue<Integer> pq = new Prio...
Closure in Java 7 [closed]
...s lots of information to get you started as well as videos. An here is an excellent Google talk - Advanced Topics In Programming Languages - Closures For Java with Neal Gafter, as well.
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impr...
How to delete an item in a list if it exists?
I am getting new_tag from a form text field with self.response.get("new_tag") and selected_tags from checkbox fields with
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Fastest hash for non-cryptographic uses?
...to store a short hash of them instead (I will be simply comparing if they exist or not, so hash is ideal).
13 Answers
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Access parent DataContext from DataTemplate
I have a ListBox which binds to a child collection on a ViewModel. The listbox items are styled in a datatemplate based on a property on the parent ViewModel:
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How to get the mouse position without events (without moving the mouse)?
...with a div that covers the whole document. Inside that, create (say) 2,000 x 2,000 <a> elements (so that the :hover pseudo-class will work in IE 6, see), each 1 pixel in size. Create a CSS :hover rule for those <a> elements that changes a property (let's say font-family). In your load ha...