range

I have a dynamically defined named range in my excel ss that grabs data out of a table based on a start date and an end date like this =OFFSET(Time!$A$1,IFERROR(MATCH(Date_Range_Start,AllDates,0)-1,MATCH(Date_Range_Start,AllDates)),1,MATCH(Date_Range_End,AllDates)-IFERROR(MATCH(Date_Range_Start,AllDates,0)-1,MATCH(Date_Range_Start,AllDates)),4) But if the date range has no data in the table, the range doesn't exists (or something, idk). How can I write code in VBA to test if this range exists or not? I have tried something like If Not Range("DateRangeData") Is Nothing Then but I get "Runtime

UPDATE 2 : For posterity, this is how I've settled on doing it (thanks to Jorg's input): 100.step(2, -2) do |x| # my code end (Obviously there are plenty of ways to do this; but it sounds like this is the most "Ruby" way to do it; and that's exactly what I was after.) UPDATE : OK, so what I was looking for was step : (2..100).step(2) do |x| # my code end But it turns out that I wasn't 100% forthcoming in my original question. I actually want to iterate over this range backwards. To my surprise, a negative step isn't legal. (100..2).step(-2) do |x| # ArgumentError: step can't be negative end So

Suppose I have foo which is a populated std::vector<double> . I need to operate on the elements of this vector. I'm motivated to write for (auto it : foo){ /*ToDo - Operate on 'it'*/ } But it appears that this will not write back to foo since it is a value type: a deep copy of the vector element has been taken. Can I give some guidance to auto to make it a reference type? Then I could operate directly on it . I suspect I'm missing some trivial syntax. A minimal auto reference The loop can be declared as follows: for (auto& it : foo) { // ^ the additional & is needed /*ToDo - Operate on 'it'*/

Example business_hours['monday'] = [800..1200, 1300..1700] business_hours['tuesday'] = [900..1100, 1300..1700] ... I then have a bunch of events which occupy some of these intervals, for example event = { start_at: somedatetime, end_at: somedatetime } Iterating over events from a certain date to a certain date, I create another array busy_hours['monday'] = [800..830, 1400..1415] ... Now my challenges are Creating an available_hours array that contains business_hours minus busy_hours available_hours = business_hours - busy_hours Given a certain duration say 30 minutes, find which time slots are

What's the most elgant way in Groovy to specify a range of integers and the 0.5 steps between them? e.g.: 1, 1.5, 2, 2.5, 3, 3.5, 4 Edit: To clarify: As an end result I need a range object for use in a Grails constraint. Though I suppose a list would be OK too. Best way I can see is using the step command. i.e. 1.step(4, 0.5){ print "$it "} would print out: "1 1.5 2.0 2.5 3.0 3.5" A little late, but this works too A one-liner for your above set: (2..8)*.div(2) Soo, to build on above. To test if a value val is in the range 1..n but with half values: def range = 2..(n*2).collect { return it/2.0

I'd like to take input such as: [1,2,4,5,6,7,9,13] and turn it into something like the following: [[1,2],[4,7],[9,9],[13,13]] Each sub-array represents a range of integers. Functional approach using Enumerable#chunk : ranges = [1, 2, 4, 5, 6, 7, 9, 13] .enum_for(:chunk) # .chunk for Ruby >= 2.4 .with_index { |x, idx| x - idx } .map { |_diff, group| [group.first, group.last] } #=> [[1, 2], [4, 7], [9, 9], [13, 13]] How it works: once indexed, consecutive elements in the array have the same x - idx , so we use that value to chunk (grouping of consecutive items) the input array. Finally we just