range

I've just started learning Haskell and found a strange thing. Let we have a list: ghci> [0,2..5] [0,2,4] It has 3 elements. When I use map with this list I get 3 element as output, for example: ghci> map (+ 1) [0,2..5] [1,3,5] ghci> map (* 2) [0,2..5] [0,4,8] ghci> map (`div` 2) [0,2..5] [0,1,2] But when I use fractional division I get 4 elements in output list: ghci> map (/ 2) [0,2..5] [0.0,1.0,2.0,3.0] ghci> length (map (/ 2) [0,2..5]) 4 Could you please explain why map may return more elements then it was? Thank you! It's due to the implementation of Enum for Float and Double : > [0,2..5] :

What's the most idiomatic way to convert a set of integers into a set of ranges? E.g. given the set {0, 1, 2, 3, 4, 7, 8, 9, 11} I want to get { {0,4}, {7,9}, {11,11} }. Let's say we are converting from std::set<int> into std::vector<std::pair<int, int>> . I treat Ranges as inclusive on both sides, since it's more convenient in my case, but I can work with open-ended ranges too if necessary. I've written the following function, but I feel like reinventing the wheel. Please tell maybe there's something in STL or boost for this. typedef std::pair<int, int> Range; void setToRanges(const std::set

I've been playing with some SVM implementations and I am wondering - what is the best way to normalize feature values to fit into one range? (from 0 to 1) Let's suppose I have 3 features with values in ranges of: 3 - 5. 0.02 - 0.05 10-15. How do I convert all of those values into range of [0,1]? What If, during training, the highest value of feature number 1 that I will encounter is 5 and after I begin to use my model on much bigger datasets, I will stumble upon values as high as 7? Then in the converted range, it would exceed 1... How do I normalize values during training to account for the

In Python, how can I map from a range of values to one concrete value? Basically, I want a dictionary, which I can fill with ranges and index with numbers: rd = rangedict() rd[(0, 10)] = 5 print rd[4] # prints 5 print rd[6] # prints 5 rd[(5, 15)] = 20 print rd[4] # prints 5 print rd[6] # prints 20 You could use an interval tree pip install intervaltree from intervaltree import Interval, IntervalTree rd = IntervalTree() rd[0:10] = 5 print rd[4] print rd[5] https://pypi.python.org/pypi/intervaltree Thanks to the comments I could find a solution using the intervaltree package. from intervaltree

I'm looking at VBA code that takes an entire range of cells and converts them into lowercase. I found the following: [A1:A20] = [index(lower(A1:A20),)] This works fine for a fixed range (don't entirely understand syntax, but found the following post:) Post detailing code above My problem is this: I would like to be able to set the range dynamically as I'm dealing with changing range sizes. However, the following doesn't work, and I can't seem to be able to use INDIRECT() either in VBA. Range("A1:A" & n) = [index(lower(Range("A1:A" & n)),)] Is there a way to make this work? I would really like

I read the guide from apache site but I'm a bit confused, I'm trying to ban some ranges using this syntax: order allow,deny deny from 127.0.55.0/127.0.75.255 deny from 127.0.235.0/127.0.255.255 allow from all But I think it's not working properly, probably the syntax is wrong or I'm using it in the wrong way, where should I write this text in htaccess? before the other lines or after? in the same htaccess file there're some mod rewrite script too (for anti-hotlinking). I've come to this answer using apache documentation . You can give an address range using ip/netmask pair : deny from 127.0.55