range

问题 This question already has answers here : Group by variable integer range using Linq (4 answers) Closed 3 years ago . how can we use groupped ranges for equal or greater than ? var data = new[] { new { Id = 0, Price = 2 }, new { Id = 1, Price = 10 }, new { Id = 2, Price = 30 }, new { Id = 3, Price = 50 }, new { Id = 4, Price = 120 }, new { Id = 5, Price = 200 }, new { Id = 6, Price = 1024 }, }; var ranges = new[] { 10, 50, 100, 500 }; var grouped = data.GroupBy( x => ranges.FirstOrDefault( r =

问题 Using SymPy, is it possible to limit the possible values of a symbol/variable to a certain range? I now I can set some properties while defining symbols, like positive=True , but I need more control, i.e. I need to set it to be in the interval [0,1]. This assumption should then be used for solving, simplifying etc. 回答1: You can specify the bounds as inequalities such as x >= lb and x <= ub , for example: from sympy.solvers import solve from sympy import Symbol x = Symbol('x') solve([x >= 0.5,

问题 This question already has answers here : Is there a reason that we cannot iterate on “reverse Range” in ruby? (12 answers) Closed 4 years ago . Why will (1..5).each iterate over 1,2,3,4,5 , but (5..1) will not? It returns the Range instead. 1.9.2p290 :007 > (1..5).each do |i| puts i end 1 2 3 4 5 => 1..5 1.9.2p290 :008 > (5..1).each do |i| puts i end => 5..1 回答1: The easiest way to do that is use downto 5.downto(1) do |i| puts i end 回答2: Ranges use <=> to determine if an iteration is over; 5

问题 I read through the forum for clues how to solve my problem, but none of the related threads are useable for me, with limited programming knowledge, to apply to my specific problem. My problem is this: I need to get rid of garbage lines that are clustered throughout my file, but are in between clusters of useable lines. I searched the sed manual and other informative sources about deleting ranges that match patterns, but they only mention to delete UNTIL match pattern, not TILL. Now I would

问题 Given the start and the end of an integer range, how do I calculate a normally distributed random integer between this range? I realize that the normal distribution goes into -+ infinity. I guess the tails can be cutoff, so when a random gets computed outside the range, recompute. This elevates the probability of integers in the range, but as long as the this effect is tolerable (<5%), it's fine. public class Gaussian { private static bool uselast = true; private static double next_gaussian =

问题 Given a set of n points on plane, I want to preprocess these points somehow faster than O(n^2) (O(nlog(n)) preferably), and then be able to answer on queries of the following kind "How many of n points lie inside a circle with given center and radius?" faster than O(n) (O(log(n) preferably). Can you suggest some data structure or algorithm I can use for this problem? I know that such types of problems are often solved using Voronoi diagrams, but I don't know how to apply it here. 回答1: Build a

问题 I know there is a UISlider but does anyone already made RangeSlider ( with two thumbs ?) or knows how to extend the uislider? 回答1: I don't think you can directly extend UISlider, you probably need to extend UIControl. Anyway, this is what I did and created this: http://github.com/doukasd/DoubleSlider Have a look and let me know if you find it useful. You might also want to have a look at my blog post which includes a video showing how it works (to make sure we are talking about the same thing

问题 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). 回答1: I've come to this

问题 I am absolutely new to Matlab and am trying to create an m-by-n matrix containing numbers within a specified range (ie. between -1 and 1). Is there an equivalent function to rand(m, n) where I can specify the range myself or would I need to explicitely create a bunch of random numbers (as ie. was described in this answer) and create a matrix from them? Any pointers to relevant Documentation, etc. highly appreciated. 回答1: This is straight from Matlab's documentation for rand . Is this want you

问题 I have written this code but it doesnt seems to be working , Why? Dim oRo As String Dim nRo As String Lastro = ActiveSheet.Cells(Rows.Count, 2).End(xlUp).Row oRo = "J2:O" & Lastro nRo = "Q2:V" & Lastro Range("C2:G" & Lastro).Select With Range("C2:G" & Lastro) .Range("C2:G" & Lastro).Formula = "=IF(oRo*nRo<0,ROUNDUP(oRo*1.3,-2),IF(ABS(oRo) <=ABS(nRo),nRo,ROUNDUP(oRo*1.3,-2)))" End With End Sub 回答1: Your best bet for maintainability is to embrace R1C1 notation when you write formulas to Excel