looper = (0..3).cycle
20.times { puts looper.next }
can I somehow find the next of 3? I mean if I can get .next of any particular element at any given time. Not just display loop that starts with the first element.
UPDATE
Of course I went though ruby doc before posting my question. But I did not find answer there ...
UPDATE2
input
looper = (0..max_cycle).cycle
max_cycle = variable that can be different every time the script runs
looper = variable that is always from interval (0..max_cycle) but the current value when the script starts could be any. It is based on Time.now.hour
output
I want to know .next value of looper at any time during the running time of the script
Your question is not very clear. Maybe you want something like this?
(current_value + 1) % (max_cycle + 1)
If, for example, max_cycle = 3 you will have the following output:
current_value returns
0 1
1 2
2 3
3 0
http://ruby-doc.org/core-1.9/classes/Enumerable.html#M003074
Related
I have a method called fibs_rec that results in an unexpected output:
def fibs_rec(n)
if n == 1 || n == 0
return 1
else
a = fibs_rec(n-1) + fibs_rec(n-2)
puts a
return a
end
end
fibs_rec(5)
The call fibs_rec(5) should return 1,1,2,3,5 but here is the actual output:
2
3
2
5
2
3
8
Not only is the output incorrect, it lacks a number from the beginning.
Can someone explain why is this happening?
This is correct since your recursion is splitting into two sub-problems every time it recurses. If you want the series to appear properly then you should try doing this via dynamic programming for O(n) time complexity. As is, the first and second position won’t be printed because of the base case in the recursion.
As for the incorrect answer, it seems you have not accounted for the sequence starting with 0 index. Either find 4 index in the function which will give the fifth element or modify your function to work with position instead of index.
Ive been trying to write Access VBA code to automate the addition of replicates for germination tests.
Basically I have a form where I enter the total number of Reps (NoofReps) and the number of seeds per rep (RepSize) (e.g. 50 seeds). For each record added I want it to automatically add a record for each rep and automatically calc the Rep Number (i.e if i have 4 reps then it should add 4 records, numbered 1-4 reps) as well as the RepSize (e.g 50).
I have been trying out various loops based on information from this forum and other but am still getting errors with the number of records that it generates. I have tried both the "Do while" and "Do Until" but get the same result below either way.
Could someone please let me know where I am going wrong?...If i want 2 reps then it adds 2, If i want 3 then its 246, and if i want 4 it adds >30,000!!!
For the purposes of trying to fix the code I have started to type the number of reps manually into the code in the iNoofReps so that I know the error is in the code and not from the form.
Private Sub CmdAddReps3_Click()
Dim iRepNo As Integer ' stores the current value in the series
'Open the table
Set db = CurrentDb()
Set rstGReps = db.OpenRecordset("tblGReplicates")
' Initialise the variables
iRepNo = 1
iNoofReps = 3 'iNoofReps = Me.txtNoofReps
' Add the records using a loop
rstGReps.movefirst
Do 'Until rstGReps("RepNo") = (iNoofReps + 1) ' always want to include at least 1 repNo
rstGReps.AddNew
rstGReps("GTestID") = Me.GTestID
rstGReps("RepNo") = iRepNo
rstGReps("NoofSeed") = Me.txtNoOfSeeds
' Calculate the next RepNo value in the loop
iRepNo = iRepNo + 1
rstGReps.Update
rstGReps.moveNext
Loop Until rstGReps("RepNo") = (iNoofReps) + 1 ' so that the loop includes the final repNo.
MsgBox "Finished Looping"
rstGReps.Close
Set rstGReps = Nothing
Set db = Nothing
End Sub
Any help would be appreciated!!!
Well, you're moving next here: rstGReps.moveNext, and then you're comparing rstGReps("RepNo") = (iNoofReps) + 1 after moving next, thus being on an empty record, thus always equating to false.
Loop Until iRepNo = (iNoofReps) + 1 should fix it, then you're no longer referring to the recordset, which has already been set to the next record by the time you're referring to it.
You could also fix it by just eliminating this line:
rstGReps.moveNext
Since rstGReps.AddNew already moves the recordset to a new blank record, moving it forward after adding the record doesn't make much sense. If you remove it, you might want to remove the + 1 in Loop Until rstGReps("RepNo") = (iNoofReps) + 1
Say I have a log file looking like this:
# time, count
2016-09-07 23:00:00, 1108731
2016-09-07 23:00:02, 1108733
2016-09-07 23:00:03, 1108734
Now, every next row contains a sum of all events that occurred in the past. I would like to use it in kibana and the natural way would be to have a count as a deltafied number.
So I expect an effect of:
# time, count, deltaCount
2016-09-07 23:00:00, 1108731, 0
2016-09-07 23:00:02, 1108733, 2
2016-09-07 23:00:03, 1108734, 1
How to achieve this in logstash. I know I could edit this files beforehand.
Thanks!
Solution #1: Write your plugin
One way to do it would be to create a plugin. The same problem is solved here. However, the filter that is posted there is not publicly available and, what is worse, it is actually 5 lines of code.
Solution #2: Ruby code snippet
I have found a solution in this thread on elastic forums: Keeping global variables in LS?!. The title says it all.
Cutting long story short, the solution goes as follows:
filter {
...
ruby {
init => "##previous_count = -1"
code => "
if (##previous_count == -1)
delta = 0
else
delta = event.get('count') - ##previous_count
end
event.set('requests', delta)
# remember event for next time
##previous_count = event.get('count')
"
}
}
Was not that hard after all.
I am trying to keep the last n elements from a changing list of x elements (where x >> n)
I found out about the deque method, with a fixed length, in other programming languages. I was wondering if there is something similar for VB6
Create a Class that extends an encapsulated Collection.
Add at the end (anonymous), retrieve & remove from the beginning (index 1). As part of adding check your MaxDepth property setting (or hard code it if you like) and if Collection.Count exceeds it remove the extra item.
Or just hard code it all inline if a Class is a stumper for you.
This is pretty routine.
The only thing I can think of is possibly looping through the last 5 values of the dynamic array using something like:
For UBound(Array) - 5 To UBound(Array)
'Code to store or do the desired with these values
Loop
Sorry I don't have a definite answer, but hopefully that might help.
Here's my simplest solution to this:
For i = n - 1 To 1 Step -1
arrayX(i) = arrayX(i - 1)
Next i
arrayX(0) = latestX
Where:
arrayX = array of values
n = # of array elements
latestX = latest value of interest (assumes entire code block is also
within another loop)
I am trying to make a variable that I can increment each time after I use it.
The $companyLevel os the variable that I need to increment.
count = 20
# Variables (20)
while count > 0
$levelName = ""; 8.times{$levelName << (65 + rand(25)).chr}
$companyLevel = "CLev5"
browser2.button(:id, "addCompanyLevel").click
sleep 2
browser2.text_field(:id, $companyLevel).set $levelName
$companyLevel += 1
count -= 1
end
How do I create a variable that will have a number at the end that will increment each time it is used?
Thanks.
Since you already have a count, why does this need to be a variable? why not just do simple string concatenation to create the value you want on the fly
companyLevel = "CLev" + count.to_s
Unless you need to perhaps read up on what an 'array' is?
I'd suggest you purchase and read the book "Everyday Scripting with Ruby" it's a great way to lean the basics of the ruby language and geared towards testers.
This is achieved by creating an object with a property that increments not by creating a variable that increments.